310 Metric Fasteners All dimensions listed in this section are given in millimeters (mm) unless otherwise noted. DIN/ISO Cross Reference Chart ......................................... 311 Self Tapping Screws Oval Head, Phillips & Slotted .............................. 312 Flat Head, Phillips & Slotted ............................... 313 Pan Head, Phillips & Slotted ................................ 314 Indented Hex Head ............................................... 315 Gimlet Point (Type C) .......................................... 316 Blunt Point (Type F) ............................................ 317 Trilobular Thread Rolling ............................ 318-320 Machine Screws Flat Head, Phillips & Slotted ............................... 321 Oval Head, Phillips & Slotted .............................. 322 Pan Head, Phillips & Slotted ................................ 323 Thread Dimensions, Class 6g ............................... 324 Mech. & Perform. Requirements, Class 4.8 ........ 324 Cap Screws & Bolts Hex Bolt, Partial Thread, Grades A & B .............. 326 Hex Bolt, Partial Thread Class 8.8 & 10.9 ........... 327 Hex Cap Screw, Full Thread, Grades A & B ....... 328 Hex Cap Screw, Full Thread, Class 8.8 & 10.9 ... 329 Carriage Bolt, Square Neck, Large ...................... 330 Carriage Bolt, Short Neck .................................... 331 Nuts Hex, Style 1 Dimensions ...................................... 332 Hex, Style 1, Class 6 ............................................ 332 Hex, Style 1, Class 8 & 10 ................................... 333 Hex, Style 2, Class 9 ............................................ 334 Hex, Style 2, Class 12 .......................................... 335 Hex Jam, Class 04 ................................................ 336 Nuts (continued) K-Lock, Class 8 ................................................... 337 Nylon Insert Lock, Regular Pattern ..................... 338 Nylon Insert Lock, Heavy Pattern ........................ 339 Nylon Insert Lock, Regular Pattern, DIN 985 ..... 340 Hex Flange ........................................................... 341 Malleable Cast Wing ............................................ 342 Cold Forged Wing, Class 5 .................................. 343 Domed Cap, Class 6 ............................................. 344 Internal Thread Dimensions, Class 6H ................ 345 Washers Standard Flat, Grade A ......................................... 346 Flat, Wider I.D., Grade C ..................................... 347 Flat Larger O.D., Grade A & C ............................ 348 Flat, Small O.D., Grade A .................................... 349 External Tooth Lock ............................................. 350 Internal Tooth Lock .............................................. 351 Countersunk External Tooth Lock ....................... 352 External-Internal Tooth Lock ............................... 353 Regular Split Lock ............................................... 354 Curved Spring Lock ............................................. 355 Socket Products Socket Head Cap Screw ....................................... 356 Flat Head Socket Cap Screw ................................ 357 Socket Set Screw, Cone Point .............................. 358 Socket Set Screw, Flat Point ................................ 359 Socket Set Screw, Cup Point ................................ 360 Socket Set Screw, Dog Point ................................ 361 Socket Shoulder Screw ................................ 362-363 Button Head Socket Cap Screw ........................... 364 Thread Dimensions, Class 5g/6g ......................... 365
56
Embed
Metric Fasteners - Kanebridge DIN/ ISO Metric Fasteners Cross-Reference DIN ISO JIS Category Standard Standard Standard Description 13 68 Internal Threads, Class 6H 13 898-1 External
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310
Metric Fasteners
All dimensions listed in this section are given in millimeters (mm) unless otherwise noted.
Cap Screws & BoltsHex Bolt, Partial Thread, Grades A & B .............. 326Hex Bolt, Partial Thread Class 8.8 & 10.9 ........... 327Hex Cap Screw, Full Thread, Grades A & B ....... 328Hex Cap Screw, Full Thread, Class 8.8 & 10.9 ... 329Carriage Bolt, Square Neck, Large ...................... 330Carriage Bolt, Short Neck .................................... 331
NutsHex, Style 1 Dimensions ...................................... 332Hex, Style 1, Class 6 ............................................ 332Hex, Style 1, Class 8 & 10 ................................... 333Hex, Style 2, Class 9 ............................................ 334Hex, Style 2, Class 12 .......................................... 335Hex Jam, Class 04 ................................................ 336
Nuts (continued)K-Lock, Class 8 ................................................... 337Nylon Insert Lock, Regular Pattern ..................... 338Nylon Insert Lock, Heavy Pattern ........................ 339Nylon Insert Lock, Regular Pattern, DIN 985 ..... 340Hex Flange ........................................................... 341Malleable Cast Wing ............................................ 342Cold Forged Wing, Class 5 .................................. 343Domed Cap, Class 6 ............................................. 344Internal Thread Dimensions, Class 6H ................ 345
WashersStandard Flat, Grade A ......................................... 346Flat, Wider I.D., Grade C ..................................... 347Flat Larger O.D., Grade A & C ............................ 348Flat, Small O.D., Grade A .................................... 349External Tooth Lock ............................................. 350Internal Tooth Lock .............................................. 351Countersunk External Tooth Lock ....................... 352External-Internal Tooth Lock ............................... 353Regular Split Lock ............................................... 354Curved Spring Lock ............................................. 355
Socket ProductsSocket Head Cap Screw ....................................... 356Flat Head Socket Cap Screw ................................ 357Socket Set Screw, Cone Point .............................. 358Socket Set Screw, Flat Point ................................ 359Socket Set Screw, Cup Point ................................ 360Socket Set Screw, Dog Point ................................ 361Socket Shoulder Screw ................................ 362-363Button Head Socket Cap Screw ........................... 364Thread Dimensions, Class 5g/6g ......................... 365
311
Metric FastenersDIN/ ISOCross-Reference
DIN ISO JIS CategoryStandard Standard Standard Description
13 68 Internal Threads, Class 6H13 898-1 External Threads, Class 6g13 R1501 Internal Threads, Class 6H84 1207 Machine Screws, Slotted Cheese Head85 1580 Machine Screws, Slotted Pan Head
Description A trilobular thread forming screw with a machine screw's thread pitch. As each lobe of the screw moves through the pilot holein the nut material, it forms and work hardens the nut thread metal, producing an uninterrupted grain flow.
Applications/ Advantages
For use in drilled, punched or cored holes in ductile metals and punch extruded metals. They provide superior prevailingtorque than can be achieved with most locking screws. Eliminates chips that result from using thread cutting screws. Requires
low drive torque and provides excellent resistance to vibrational loosening. Since these thread rolling screws are casehardened, it is not recommended they be used in die-cast or extruded aluminum or zinc.
Material AISI 1022 Steel
Surface Hardness 550 HV 0.3 Min.
Case DepthM2.5: 0.04-0.12 mm
M3: 0.05-0.18 mmM4 & M5: 0.10-0.25 mm
Core Hardness 240 - 370 HV 5
Torsional Strength The torque required to cause failure shall be equal to or greater than the breaking torque values shown in the above table.
Tensile Strength The tensile force required to cause failure shall be equal to or greater than the breaking force values shown in the above table.
Plating Thread rolling screws shall have a zinc finish with a wax coating. For more details see Appendix-A.
319
Self- Tapping ScrewsMETRICThread Rolling ScrewHead Dimensions
METRIC - TYPE Z (1A) FLAT HEADS FOR TAPPING SCREWS DIN 965
Nominal Size
A H M G
Drive SizeHead Diameter Head HeightRecess
DiameterRecess Penetration
Max Min Max Ref Max Min
M2.5 4.7 4.4 1.5 2.8 1.73 1.48 1
M3 5.5 5.2 1.65 3 2.01 1.76 1
M4 8.40 8.04 2.7 4.4 2.51 2.06 2
M5 9.30 8.94 2.7 4.9 3.05 2.60 2
METRIC - TYPE Z (1A) PAN HEADS FOR TAPPING SCREWS DIN 7985
NominalSize
A H M G S
Drive SizeHead Diameter Head HeightRecess
DiameterRecess Penetration Side Height
Max Min Max Min Ref Max Min Ref
M2.5 5.00 4.70 2.12 1.88 2.6 1.52 1.27 1.3 1
M3 6.00 5.70 2.52 2.28 3.0 1.93 1.68 1.6 1
M4 8.00 7.64 3.25 2.95 4.3 2.36 1.90 4.3 2
M5 10.00 9.64 3.95 3.65 5.0 3.10 2.64 2.5 2
320
METRICSelf-Tapping Screws Thread Rolling ScrewHole Size Data
NOTES:The values listed above are assigned to various materials and lengths of engagement and should be used as guidelines.
GUIDELINE VALUES FOR HOLE DIAMETERS USING DIN 7500 THREAD ROLLING SCREWS DIN 7500
Thread Size M2.5 M3 M4 M5
Materialthickness or
length ofengagement
Hole Diameter (dh)
Max Min Max Min Max Min Max Min
0.8 2.31 2.25
0.9 2.31 2.25
1 2.31 2.25 2.76 2.7
1.2 2.31 2.25 2.76 2.7
1.5 2.31 2.25 2.76 2.7 3.66 3.6 4.56 4.5
1.6 2.31 2.25 2.76 2.7 3.66 3.6 4.56 4.5
1.7 2.31 2.25 2.76 2.7 3.66 3.6 4.56 4.5
1.8 2.31 2.25 2.81 2.75 3.66 3.6 4.56 4.5
2 2.31 2.25 2.81 2.75 3.66 3.6 4.56 4.5
2.2 2.31 2.25 2.81 2.75 3.66 3.6 4.56 4.5
2.5 2.31 2.25 2.81 2.75 3.71 3.65 4.56 4.5
3 2.36 2.3 2.81 2.75 3.71 3.65 4.56 4.5
3.2 2.375 2.3 2.825 2.75 3.725 3.65 4.625 4.55
3.5 2.375 2.3 2.825 2.75 3.725 3.65 4.625 4.55
4 2.375 2.3 2.825 2.75 3.725 3.65 4.625 4.55
5 2.375 2.3 2.825 2.75 3.775 3.7 4.675 4.6
5.5 2.825 2.75 3.775 3.7 4.675 4.6
6 2.825 2.75 3.775 3.7 4.675 4.6
6.3 3.79 3.7 4.74 4.65
6.5 3.79 3.7 4.74 4.65
7 3.79 3.7 4.74 4.65
7.5 3.79 3.7 4.74 4.65
8 thru 10 4.74 4.65
321
METRIC - PHILLIPS FLAT HEADS FOR MACHINE SCREWS ISO 7046-1
NominalSize
ThreadPitch
A H M G U
PhillipsDriver SizeHead Diameter
HeadHeight
RecessDiameter Recess Penetration Thread Runout
Max Min Max Ref Max Min Max
M1.6 0.35 3.0 2.7 1 1.6 0.9 0.6 0.7 0
M2 0.4 3.8 3.5 1.2 1.9 1.2 0.9 0.8 0
M2.5 0.45 4.7 4.4 1.5 2.9 1.8 1.4 0.9 1
M3 0.5 5.5 5.2 1.65 3.2 2.1 1.7 1 1
M4 0.7 8.40 8.04 2.7 4.6 2.6 2.1 1.4 2
M5 0.8 9.30 8.94 2.7 5.2 3.2 2.7 1.6 2
M6 1 11.30 10.87 3.3 6.8 3.5 3.0 2 3
M8 1.25 15.80 15.37 4.65 8.9 4.6 4.0 2.5 4
M10 1.5 18.30 17.78 5 10 5.7 5.1 3 4
METRIC - SLOTTED FLAT HEADS FOR MACHINE SCREWS ISO 2009
NominalSize
ThreadPitch
A H J T U
Head DiameterHeadHeight Width of Slot Depth of Slot Thread Runout
Max Min Max Max Min Max Min Max
M1.6 0.35 3.0 2.7 1 0.60 0.46 0.50 0.32 0.7
M2 0.4 3.8 3.5 1.2 0.70 0.56 0.6 0.4 0.8
M2.5 0.45 4.7 4.4 1.5 0.80 0.66 0.75 0.50 0.9
M3 0.5 5.5 5.2 1.65 1.00 0.86 0.85 0.60 1
M4 0.7 8.40 8.04 2.7 1.51 1.26 1.3 1.0 1.4
M5 0.8 9.30 8.94 2.7 1.51 1.26 1.4 1.1 1.6
M6 1 11.30 10.87 3.3 1.91 1.66 1.6 1.2 2
M8 1.25 15.80 15.37 4.65 2.31 2.06 2.3 1.8 2.5
M10 1.5 18.30 17.78 5 2.81 2.56 2.6 2.0 3
T
90o
±2
H
JMA
H
Slotted Phillips
U U
A
Flat Head Machine ScrewsMETRIC
322
Oval HeadMachine Screws METRIC
METRIC - PHILLIPS OVAL HEADS FOR MACHINE SCREWS ISO 7047
NominalSize
ThreadPitch
A H O M G UPhillipsDriverSize
Head Diameter Head SideHeight
Height ofOval
RecessWidth
Recess Penetration Thread Runout
Max Min Max Ref Ref Max Min Max
M1.6 0.35 3.0 2.7 1 0.4 1.9 1.2 0.9 0.7 0
M2 0.4 3.8 3.5 1.2 0.5 2 1.5 1.2 0.8 0
M2.5 0.45 4.7 4.4 1.5 0.6 3 1.85 1.50 0.9 1
M3 0.5 5.5 5.2 1.65 0.7 3.4 2.2 1.8 1 1
M4 0.7 8.40 8.04 2.7 1 5.2 3.2 2.7 1.4 2
M5 0.8 9.30 8.94 2.7 1.2 5.4 3.4 2.9 1.6 2
M6 1 11.30 10.87 3.3 1.4 7.3 4.0 3.5 2 3
M8 1.25 15.80 15.37 4.65 2 9.6 5.25 4.75 2.5 4
M10 1.5 18.30 17.78 5 2.3 10.4 6.0 5.5 3 4
METRIC - SLOTTED OVAL HEADS FOR MACHINE SCREWS ISO 2010
NominalSize
ThreadPitch
A H O J T U
Head Diameter Head SideHeight
Height ofOval
Width of Slot Depth of Slot Thread Runout
Max Min Max Ref Max Min Max Min Max
M1.6 0.35 3.0 2.7 1 0.4 0.60 0.46 0.80 0.64 0.7
M2 0.4 3.8 3.5 1.2 0.5 0.70 0.56 1.0 0.8 0.8
M2.5 0.45 4.7 4.4 1.5 0.6 0.80 0.66 1.2 1.0 0.9
M3 0.5 5.5 5.2 1.65 0.7 1.00 0.86 1.45 1.20 1
M4 0.7 8.40 8.04 2.7 1 1.51 1.26 1.9 1.6 1.4
M5 0.8 9.30 8.94 2.7 1.2 1.51 1.26 2.4 2.0 1.6
M6 1 11.30 10.87 3.3 1.4 1.91 1.66 2.8 2.4 2
M8 1.25 15.80 15.37 4.65 2 2.31 2.06 3.7 3.2 2.5
M10 1.5 18.30 17.78 5 2.3 2.81 2.56 4.4 3.8 3
OJ
HT
90o
±2M
G
A
U
A
U
OH
Slotted Phillips
323
H1H
J
T G
A M A
UW
U
Slotted Phillips
METRIC - SLOTTED PAN HEADS FOR MACHINE SCREWS ISO 1580
NominalSize
ThreadPitch
A H J T W U
Head Diameter Head Height Width of Slot Depth ofSlot
Description A metric machine screw is a straight shank fastener with a metric thread pitch designed to go through a hole or nut that is pre-tapped to form a mating thread for the screw.
Applications/Advantages
Machine screws form a fastening superior in strength to spaced thread screws. Metric screws are the type almost exclusively usedin items manufactured in Europe.
MaterialClass 4.8 machine screws shall be made from a carbon steel, partially or fully annealed as required, which conforms to the following
Tolerance on Length12-16mm: ±0.35 20-30mm: ±0.42 35-50mm: ±0.5 55-80mm: ±0.6
90-120: ±0.7 130-150mm: ±0.8
327
CLASS 8.8 BOLTS
CLASS 10.9 BOLTS10.9
10.9
8.8
8.8
Description A hex bolt with metric thread pitch made from medium carbon steel and heat-treated. Grade-A bolts are the preferred style for mostapplications. Grade-B bolts have looser tolerances and can be manufactured in a cold or hot-forging process.
Applications/Advantages
Has greater tensile strength than Class 4.6, 4.8 and 5.8 bolts.
Material
Class 8.8 bolts can be made from a carbon steel with additives (such as Boron, Manganese or Chromium) which conforms to thefollowing chemical composition-- Carbon: 0.15-0.40%; Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum. In case of plain
carbon boron alloyed steel with a carbon content of less than 0.25% (ladle analysis), the minimum Manganese content shall be 0.6%
Class 8.8 bolts can be made from a carbon steel which conforms to the following chemical composition-- Carbon: 0.25-0.55%;Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum.
Heat Treatment Class 8.8 bolts shall be heat treated by quenching in a liquid medium from above the transformation temperature and reheating to atempering temperature of 425°C.
Core Hardness For diameters less than or equal to 16mm: Rockwell C22 - 32 (Vickers HV 250 - 320)For diameters greater than 16mm: Rockwell C23 - 34 (Vickers HV 255 - 335)
Surface Hardness Shall not be more than 30 Vickers points above the measured core hardness on the product
Proof Load For diameters less than or equal to 16mm: 640 N/mm2 minimumFor diameters greater than 16mm: 660 N/mm2 minimum
Tensile Strength For diameters less than or equal to 16mm: 800 N/mm2 minimumFor diameters greater than 16mm: 830 N/mm2 minimum
Elongation 12% minimum
Plating See Appendix-A for plating information
Description A bolt with metric thread pitch made from medium carbon alloy steel and heat-treated. Grade-A bolts are the preferred style for mostapplications. Grade-B bolts have looser tolerances and can be manufactured in a cold or hot-forging process.
Applications/Advantages
Has greater tensile strength than Class 8.8 bolts; is most comparable but not exactly equivalent to U.S. Grade 8 cap screws.
Material
Class 10.9 bolts can be made from a carbon steel which conforms to the following chemical composition-- Carbon: 0.25-0.55%;Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum.
Class 10.9 bolts can be made from a low carbon martensite steel with additives (such as Boron, Manganese or Chromium) whichconforms to the following chemical composition-- Carbon: 0.20-0.55%; Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum. Incase of plain carbon boron alloyed steel with a carbon content 0f less than 0.25% (ladle analysis), the minimum Manganese content
shall be 0.7%
Class 10.9 bolts can be made from an alloy steel which conforms to the following chemical composition--Carbon: 0.20-0.55%; Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum; and shall contain one or more of the following
elements: Chromium, Nickel, Molybdenum or Vanadium
Heat TreatmentClass 10.9 bolts shall be heat treated by quenching in oil from above the transformation temperature and reheating to a tempering
Bolts & Cap ScrewsMETRICFull Thread Hex CapScrews Class 8.8 & 10.9
Description A cap screw with metric thread pitch, threaded to the head, made from medium carbon steel and heat-treated. Grade-A bolts are thepreferred style for most applications. Grade-B bolts have looser tolerances and can be manufactured in a cold or hot-forging process.
Applications/Advantages
Has greater tensile strength than Class 4.6, 4.8 and 5.8 cap screws. Being threaded to the head makes the part useful for mountingmotors to machinery. They are also used in automotive and truck repair.
Material
Class 8.8 cap screws can be made from a carbon steel with additives (such as Boron, Manganese or Chromium) which conforms to thefollowing chemical composition-- Carbon: 0.15-0.40%; Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum. In case of plain
carbon boron alloyed steel with a carbon content of less than 0.25% (ladle analysis), the minimum Manganese content shall be 0.6%
Class 8.8 cap screws can be made from a carbon steel which conforms to the following chemical composition-- Carbon: 0.25-0.55%;Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum.
Heat Treatment Class 8.8 cap screws shall be heat treated by quenching in a liquid medium from above the transformation temperature and reheating toa tempering temperature of 425°C.
Core Hardness For diameters less than or equal to 16mm: Rockwell C22 - 32 (Vickers HV 250 - 320)For diameters greater than 16mm: Rockwell C23 - 34 (Vickers HV 255 - 335)
Surface Hardness Shall not be more than 30 Vickers points above the measured core hardness on the product
Proof Load For diameters less than or equal to 16mm: 640 N/mm2 minimumFor diameters greater than 16mm: 660 N/mm2 minimum
Tensile Strength For diameters less than or equal to 16mm: 800 N/mm2 minimumFor diameters greater than 16mm: 830 N/mm2 minimum
Elongation 12% minimum
Plating See Appendix-A for plating information
CLASS 8.8 FULL-THREAD CAP SCREWS
CLASS 10.9 FULL-THREAD CAP SCREWS
8.8
8.8
10.9
10.9
DescriptionA cap screw with metric thread pitch, threaded to the head, made from medium carbon alloy steel and heat-treated. Grade-A bolts are
the preferred style for most applications. Grade-B bolts have looser tolerances and can be manufactured in a cold or hot-forgingprocess.
Applications/Advantages
Has greater tensile strength than Class 8.8 full-thread cap screws. Is most comparable but not exactly equivalent to U.S. Grade 8 capscrews.
Material
Class 10.9 cap screws can be made from a carbon steel which conforms to the following chemical composition-- Carbon: 0.25-0.55%;Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum.
Class 10.9 cap screws can be made from a low carbon martensite steel with additives (such as Boron, Manganese or Chromium) whichconforms to the following chemical composition-- Carbon: 0.20-0.55%; Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum. Incase of plain carbon boron alloyed steel with a carbon content 0f less than 0.25% (ladle analysis), the minimum Manganese content
shall be 0.7%
Class 10.9 cap screws can be made from an alloy steel which conforms to the following chemical composition--Carbon: 0.20-0.55%; Phosphorus: 0.035% maximum; Sulfur: 0.035% maximum; and shall contain one or more of the following
elements: Chromium, Nickel, Molybdenum or Vanadium
Heat Treatment Class 10.9 cap screws shall be heat treated by quenching in oil from above the transformation temperature and reheating to a temperingtemperature of 425°C.
Description A round head, self-anchoring bolt with a square neck under the head and a metric thread pitch.
Applications/Advantages
The square neck is designed to keep the bolt from turning as a nut is tightened. Best for use in wood or thick gauge sheet metal.
Material Class 4.6 carriage bolts shall be made from a carbon steel which conforms to the following chemical composition--Carbon: 0.55% maximum; Phosphorus: 0.05% maximum; Sulfur: 0.06% maximum.
Tolerance on Length12-16mm: ±0.9 20-30mm: ±1.05 35-50mm: ±1.25
55-80mm: ±1.5 90-120mm: ±1.75 130-160mm: ±2.0
Description A round head, self-anchoring bolt with a shorter square neck than a standard carriage bolt, and a metric thread pitch.
Applications/Advantages
Used in the same way as a standard carriage bolt but in sheet metal where a full-sized square neck would cause an obstruction onthe nut side of the fastening.
Material Class 4.8 carriage bolts shall be made from a carbon steel which conforms to the following chemical composition--Carbon: 0.55% maximum; Phosphorus: 0.05% maximum; Sulfur: 0.06% maximum.
DescriptionA six-sided internally threaded, non-heat treated fastener with a metric thread pitch. Nuts M16 and smaller are chamfered on the top andthe bearing surface. Nuts M18 and larger may be either double chamfered, or have a washer face on one side and a chamfered surface
on the opposite side.
Applications/Advantages
Class 6 nuts are intended for use with screws and bolts of property class 6.8 or lower. They are the most popular nut for use with metricmachine screws.
Material
Class 6 nuts shall be made of a steel which conforms to the following chemical composition--Carbon: 0.50% maximum; Phosphorus: 0.060% maximum; Sulfur: 0.150% maximum.
Class 6 nuts may also be made from free-cutting steel which conforms to the following chemical composition--Carbon: 0.50% maximum; Sulfur: 0.34% minimum; Phosphorus: 0.11% minimum; Lead: 0.35% minimum.
Description A Style 1, heat treated fastener with a metric thread pitch. Nuts M16 and smaller are chamfered on the top and the bearing surface. NutsM20 and larger may be either double chamfered, or have a washer face on one side and a chamfered surface on the opposite side.
Applications/Advantages
Class 10 nuts are intended for use with screws and bolts of property classes 10.9 and lower. They are widely used in farm equipment.
Material Class 10 nuts shall be made of a steel which conforms to the following chemical composition-- Carbon: 0.58% maximum;Manganese: 0.30% minimum; Phosphorus: 0.048% maximum; Sulfur: 0.058% maximum.
Heat Treatment Class 10 nuts shall be heat treated by quenching in a liquid medium from a temperature above the transformation temperature andtempering at a temperature of at least 425°C.
Hardness Rockwell C26 - 36 (Vickers HV 272 - 353)
Proof LoadDiameters through M10: 1040 N/mm2
Diameters M12 through M16: 1050 N/mm2
Diameters M18 through M39: 1060 N/mm2
Plating See Appendix-A for plating information
DescriptionA Style 1 hex nut with a metric thread pitch. Nuts M16 and smaller are chamfered top and bottom, and are not heat-treated. Nuts M18and larger are (1) heat-treated and (2) may be double chamfered, or have a washer face on one side and a chamfered surface on the
opposite side.
Applications/Advantages
Class 8 nuts are intended for use with screws and bolts of property class 8.8 or lower. They are widely used in the automotive andelectronics industries.
Material Class 8 nuts shall be made of a steel which conforms to the following chemical composition--Carbon: 0.58% maximum; Manganese: 0.25% minimum; Phosphorus: 0.060% maximum; Sulfur: 0.150% maximum.
Heat TreatmentClass 8 nuts of diameter 18mm or greater shall be heat treated by quenching in a liquid medium from a temperature above the
transformation temperature and tempering at a temperature of at least 425°C.
Diameters through M18 through M39: Vickers HV 233 - 353 (Rockwell C18 - 36)
Proof Load
Diameters M1.6 through M4: 800 N/mm2
Diameters M5 through M7: 855 N/mm2
Diameters M8 through M10: 870 N/mm2
Diameters M12 through M16: 880 N/mm2
Diameters M18 through M36: 920 N/mm2
Plating See Appendix-A for plating information
334
METRICNuts Hex Nut Style 2Class 9
H
G
F
METRIC - HEX NUTS, STYLE 2 ISO 4033
Nominal Size Thread Pitch
F G H
Width Across Flats Width Across Corners Thickness
Max Min Min Max Min
M5 0.8 8 7.78 8.79 5.1 4.8
M6 1 10 9.78 11.05 5.7 5.4
M8 1.25 13 12.73 14.38 7.5 7.14
M10 1.5 16 15.73 17.77 9.3 8.94
M12 1.75 18 17.73 20.03 12 11.57
M14 2 21 20.67 23.35 14.1 13.4
M16 2 24 23.67 26.75 16.4 15.7
M20 2.5 30 29.16 32.95 20.3 19
M24 3 36 35 39.55 23.9 22.6
M30 3.5 46 45 50.85 28.6 27.3
M36 4 55 53.8 60.79 34.7 33.1
9
9
DescriptionA six-sided internally threaded, non-heat treated fastener with a metric thread pitch which, as a Style 2 nut, is approximately 10% thicker
than a Style 1 nut of the same nominal diameter. Nuts M16 and smaller are chamfered on the top and the bearing surface. Nuts M18and larger may be either double chamfered, or have a washer face on one side and a chamfered surface on the opposite side.
Applications/Advantages
Class 9 nuts are intended for use with screws and bolts of property classes 4.6, 4.8, 5.8, 8.8 or 9.8.
Material Class 9 nuts shall be made of a steel which conforms to the following chemical composition-- Carbon: 0.58% maximum;Manganese: 0.25% minimum; Phosphorus: 0.060% maximum; Sulfur: 0.150% maximum.
DescriptionA six-sided internally threaded, heat treated fastener with a metric thread pitch. Style 2 nuts are approximately 10% thicker than
Style 1 nuts of the same nominal diameter. Nuts M16 and smaller are chamfered on the top and the bearing surface. Nuts M18 andlarger may be either double chamfered, or have a washer face on one side and a chamfered surface on the opposite side.
Applications/Advantages
Class 12 nuts are intended for use with screws and bolts of property classes 12.9 or lower.
Material Class 12 nuts shall be made of a steel which conforms to the following chemical composition-- Carbon: 0.58% maximum;Manganese: 0.45% minimum; Phosphorus: 0.048% maximum; Sulfur: 0.058% maximum.
Heat Treatment Class 12 nuts shall be heat treated by quenching in a liquid medium from a temperature above the transformation temperature andtempering at a temperature of at least 425°C.
Proof LoadStyle 1: Diameters M1.6 through M10: 1140 N/mm2; Diameters M12 through M16: 1170 N/mm2
Style 2: Diameters M1.6 through M7: 1150 N/mm2; Diameters M8 through M10: 1160 N/mm2;Diameters M12 through M16: 1190 N/mm2; Diameters M18 through M36: 1200 N/mm2
Plating See Appendix-A for plating information
336
Nuts METRIC Hex Jam
H1
G
F
METRIC - HEX JAM NUTS ISO 4035
Nominal Size Thread Pitch
F G H
Width Across Flats Width Across Corners Thickness
Max Min Min Max Min
M1.6 0.35 3.2 3.02 3.41 1 0.75
M2 0.4 4 3.82 4.32 1.20 0.95
M2.5 0.45 5 4.82 5.45 1.60 1.35
M3 0.5 5.5 5.32 6.01 1.80 1.55
M4 0.7 7 6.78 7.66 2.20 1.95
M5 0.8 8 7.78 8.79 2.70 2.45
M6 1 10 9.78 11.05 3.20 2.9
M8 1.25 13 12.73 14.38 4 3.7
M10 1.5 16 15.73 17.77 5 4.7
M12 1.75 18 17.73 20.03 6 5.7
M14 2 21 20.67 23.35 7 6.42
M16 2 24 23.67 26.75 8 7.42
M20 2.5 30 29.16 32.95 10 9.10
M24 3 36 35 39.55 12 10.9
M30 3.5 46 45 50.85 15 13.9
M36 4 55 53.8 60.79 18 16.9
M42 4.5 65 63.1 71.3 21 19.7
M48 5 75 73.1 82.6 24 22.7
DescriptionA six-sided internally threaded, non-heat treated fastener with a metric thread pitch that is approximately 1/2 the thickness of a Style 2nut. Nuts M16 and smaller are chamfered on the top and the bearing surface. Nuts M18 and larger may be either double chamfered, or
have a washer face on one side and a chamfered surface on the opposite side.
Applications/Advantages
Class 04 metric hex jam nuts are tightened against the work surface and a Style 1 or Style 2 hex nut is tightened against the jam nut tokeep it from loosening.
Material Class 04 hex jam nuts shall be made of a steel which conforms to the following chemical composition-- Carbon: 0.58% maximum;Manganese: 0.25% minimum; Phosphorus: 0.060% maximum; Sulfur: 0.150% maximum.
Description A hex nut with metric thread pitch, pre-assembled with a free spinning external tooth lock washer. The locking action is achieved when thenut is tightened against a bearing surface as the teeth of the lock washer dig into it.
Applications/Advantages This is the most popular type of locknut because of its versatility, cost and ease of installation. Doesn't gall screw threads.
MaterialNuts shall be made from a low carbon steel which conforms to the following chemical composition requirements--
METRIC - NYLON INSERT STOP NUTS, REGULAR PATTERN, CLASS 8 STYLE 1 ISO 7040
Nominal Size Thread Pitch
F G H I
Width Across FlatsWidth Across
CornersThickness
WrenchingHeight
Max Min Min Max Min Min
M3 0.5 5.50 5.32 6.01 4.5 4.02 1.72
M4 0.7 7.00 6.78 7.66 6.00 5.52 2.32
M5 0.8 8.00 7.78 8.79 6.80 6.22 3.52
M6 1 10.00 9.78 11.05 8.00 7.42 3.92
M8 1.25 13.00 12.73 14.38 9.50 8.92 5.15
M10 1.5 16.00 15.73 17.77 11.9 11.2 6.43
M12 1.75 18.00 17.73 20.03 14.9 14.2 8.3
M16 2 24.00 23.67 26.75 19.1 17.8 11.28
M20 2.5 30.00 29.16 32.95 22.8 20.7 13.52
M24 3 36 35 39.55 27.1 25.0 16.16
M30 3.5 46 45 50.85 32.6 30.1 19.44
M36 4 55.0 53.8 60.79 38.9 36.4 23.52
H
I
G
F
DescriptionHex nut with a metric thread pitch and a nylon-filled collar at its back end. Class 8, style 1 nuts of a basic diameter greater than M16are quenched and tempered. When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement
of the screw when it is subjected to vibration. The nylon insert comes in various colors.
Applications/Advantages
Class 8 metric nylon insert lock nuts are to be used with screw of a Class 8.8 or less. It is able to be reused more times than a two-way reversible nut. It is less expensive than a Grade-C automation lock nut. Nylon insert lock nuts are designed for use in
temperatures from -73°C to +120°C.
Material Class 8 metric nylon insert lock nuts shall be made of a steel which conforms to the following chemical composition--Carbon: 0.58% maximum; Manganese: 0.25% minimum; Phosphorus: 0.060% maximum; Sulfur: 0.150% maximum.
HardnessM3 - M4: HV 180 - 302 (Rockwell B 87.1 - C 30)
M5 - M16: HV 200 - 302 (Rockwell B 91.5 - C 30)M20 - M36: HV 233 - 353 (Rockwell C 18 - C 36)
Proof Load (N/mm2)
M3 - M4: 800M5 - M7: 855
M8 - M10: 870M12 - M16: 880M20 - M36: 920
Plating See Appendix-A for plating information
339
NutsMETRICNylon Insert Lock Nuts- Heavy Pattern
METRIC - NYLON INSERT STOP NUTS, HEAVY PATTERN, CLASS 9 STYLE 2 ISO 7040
Nominal Size Thread Pitch
F G H I
Width Across FlatsWidth Across
CornersThickness
WrenchingHeight
Max Min Min Max Min Min
M5 0.8 8.00 7.78 8.79 7.20 6.62 3.52
M6 1 10.00 9.78 11.05 8.50 7.92 3.92
M8 1.25 13.00 12.73 14.38 10.2 9.5 5.15
M10 1.5 16.00 15.73 17.77 12.8 12.1 6.43
M12 1.75 18.00 17.73 20.03 16.1 15.4 8.3
M16 2 24.00 23.67 26.75 20.7 19.4 11.28
M20 2.5 30.00 29.16 32.95 25.1 23.0 13.52
M24 3 36 35 39.55 29.5 27.4 16.16
M30 3.5 46 45 50.85 35.6 33.1 19.44
M36 4 55.0 53.8 60.79 42.6 40.1 23.52
G
FH
I
DescriptionSimilar in design to a regular nylon insert stop nut except that it is 6-8% thicker. When a screw reaches the collar, the threads and
nylon form a tight, frictional fit, restricting movement of the screw when it is subjected to vibration. The nylon insert comes in variouscolors.
Applications/Advantages
Provides a greater length of thread engagement than regular nylon insert stop nuts resulting in greater proof load stress properties.Class 9, style 2 metric nylon insert lock nuts are to be used with screw of a Class 9.8 or less. It is able to be reused more times than a
two-way reversible nut. It is less expensive than a Grade-C automation lock nut. Nylon insert lock nuts are designed for use intemperatures from -73°C to +120°C.
MaterialClass 9 metric nylon insert lock nuts shall be made of a steel which conforms to the following chemical composition--Carbon: 0.58% maximum; Manganese: 0.25% minimum; Phosphorus: 0.060% maximum; Sulfur: 0.150% maximum.
METRIC - NYLON INSERT STOP NUTS, REGULAR PATTERN, CLASS 8 DIN 985
Nominal Size
F G H I
Width Across FlatsWidth Across
CornersThickness Wrenching Height
Max Min Min Max Min Min
M3 5.50 5.32 6.01 4 3.7 2.4
M4 7.00 6.78 7.66 5 4.7 2.9
M5 8.00 7.78 8.79 5 4.7 3.2
M6 10.00 9.78 11.05 6 5.7 4
M7 11.00 10.73 12.12 7.5 7.14 4.7
M8 13.00 12.73 14.38 8 7.64 5.5
M10 17.00 16.73 18.90 10 9.64 6.5
M12 19.00 18.67 21.10 12 11.57 8
M14 22.00 21.67 24.49 14 13.3 9.5
M16 24.00 23.67 26.75 16 15.3 10.5
M18 27.00 26.16 29.56 18 17.66 13
M20 30.00 29.16 32.95 20 18.7 14
DescriptionHex nut with a metric thread pitch and a nylon-filled collar at its back end. Class 8, style 1 nuts of a basic diameter greater than M16are quenched and tempered. When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement
of the screw when it is subjected to vibration. The nylon insert comes in various colors.
Applications/Advantages
Class 8 metric nylon insert lock nuts are to be used with screw of a Class 8.8 or less. It is able to be reused more times than a two-way reversible nut. It is less expensive than a Grade-C automation lock nut. Nylon insert lock nuts are designed for use in
temperatures from -73°C to +120°C.
Material M3 - M16: AISI 1006, 1010, 1022 or equivalent steelM18 and larger: AISI 1035 or equivalent steel
Hardness Vickers HV 5: 302 maximumRockwell: C 30 maximum
Proof Load (N/mm2) 800
Plating DIN 985 nylon insert stop nuts are usually supplied zinc plated. See Appendix-A for more information.
341
NutsMETRICHex Flange Nuts
METRIC - HEX FLANGE NUTS, STYLE 1 ISO 4161
Nominal Size Thread Pitch
F G H B
Width Across FlatsWidth Across
CornersNut Thickness
FlangeDiameter
Max Min Min Max Min Max
M5 0.8 8.00 7.78 8.79 5 4.7 11.8
M6 1 10.00 9.78 11.05 6 5.7 14.2
M8 1.25 13.00 12.73 14.38 8 7.6 17.9
M10 1.5 15.00 14.73 16.64 10 9.6 21.8
M12 1.75 18.00 17.73 20.03 12 11.6 26
M16 2 24.00 23.67 26.75 16 15.3 34.5
M20 2.5 30.00 29.16 32.95 20 18.9 42.8
Description Hex nut with an enlarged circular base flaring out from the bottom of the nut. The bearing surface of the flange is smooth.
Applications/Advantages
Larger bearing surface will span oversized or poorly aligned holes. Flange provides a more uniform bearing-stress to clamp-force ratiothan other low carbon lock nuts.
Material
Class 8 nuts shall be made of a steel which conforms to thefollowing chemical composition-- Carbon: 0.58% maximum;
Description A nut with a metric thread pitch and two wings protruding 180° from each other which allows the part to be manually turned.
Applications/Advantages
Wing nuts are used when a part is frequently assembled and disassembled at a place where torque greater than that achieved withfinger pressure is not needed. The malleable style nut has been the most common type wing nut used in Europe for many years.
Wing Spread Wing Height Wing Thickness Boss Diameter
M3 0.50 17.60 8.60 1.60 8
M4 0.70 17.60 8.60 1.60 8
M5 0.80 22.50 11 2.10 10.30
M6 1 27.80 13.60 2.50 12.70
M8 1.25 30.30 14.80 2.80 13.80
M10 1.50 36.20 17.70 3.30 16.50
M12 1.75 49.40 24.10 4.50 22.50
Description A nut with a metric thread pitch and wings set 180° apart from each other which allows the part to be manually turned.
Applications/Advantages
Class 5 metric cold-forged wing nuts are used when a part is frequently assembled and disassembled at a place where torque greaterthan that achieved with finger pressure is not needed. The cold-forged style nut has been more popular in the United States, especially
in the automotive aftermarket. It can also be safer to use than a malleable wing nut which can have sharp burrs that must be fileddown prior to installation.
Material Class 5 metric cold-forged nuts shall be made of a steel which conforms to the following chemical composition--Carbon: 0.50% maximum; Phosphorus: 0.060% maximum; Sulfur: 0.150% maximum.
Hardness M3 - M16: Vickers HV 150 - 302 (Rockwell B 78.7 - C 30)over M16 - M24: Vickers HV 170 - 302 (Rockwell B 85 - C 30)
Plating See Appendix-A for information about the plating of steel cap nuts.
345
NutsMETRICInternalThreads
Min.Major
Diameter
MinorDiameter
PitchLine
Axis of internal thread
INTERNAL THREADS, CLASS 6H DIN 13; ISO 68& ISO R 1501
Nominal SizeNormal Engagement Length Major Diameter Pitch Diameter Minor Diameter
From To Min Min Max Min Max
M1.6 0.8 2.6 1.600 1.373 1.458 1.221 1.321
M2 1 3 2.000 1.740 1.830 1.567 1.679
M2.5 1.3 3.8 2.500 2.208 2.303 2.013 2.138
M3 1.5 4.5 3.000 2.675 2.775 2.459 2.599
M4 2 6 4.000 3.545 3.663 3.242 3.422
M5 2.5 7.5 5.000 4.480 4.605 4.134 4.334
M6 3 9 6.000 5.350 5.500 4.917 5.153
M8 4 12 8.000 7.188 7.348 6.647 6.912
M10 5 15 10.000 9.026 9.206 8.376 8.676
M12 6 18 12.000 10.863 11.063 10.106 10.441
M14 8 24 14.000 12.701 12.913 11.835 12.210
M16 8 24 16.000 14.701 14.913 13.835 14.210
M20 10 30 20.000 18.376 18.600 17.294 17.744
M24 12 36 24.000 22.051 22.316 20.752 21.252
M30 15 45 30.000 27.727 28.007 26.211 26.771
M36 18 53 36.000 33.402 33.702 31.670 32.270
M42 21 63 42.000 39.077 39.392 37.129 37.799
M48 24 71 48.000 44.752 45.087 42.587 43.297
M56 28 85 56.000 52.428 52.783 50.046 50.796
M64 32 95 64.000 60.103 60.478 57.505 58.305
346
Washers METRIC StandardFlat Washers
METRIC - STANDARD FLAT WASHERS (NORMAL SERIES, GRADE A) ISO 7089
Nominal Size
ID OD T
Internal Diameter Outside Diameter Thickness
Max Min Max Min Max Min
1.6 1.84 1.7 4 3.7 0.35 0.25
2 2.34 2.2 5 4.7 0.35 0.25
2.5 2.84 2.7 6 5.7 0.55 0.45
3 3.38 3.2 7 6.64 0.55 0.45
3.5 3.88 3.7 8 7.64 0.55 0.45
4 4.48 4.3 9 8.64 0.9 0.7
5 5.48 5.3 10 9.64 1.1 0.9
6 6.62 6.4 12 11.57 1.8 1.4
8 8.62 8.4 16 15.57 1.8 1.4
10 10.77 10.5 20 19.48 2.2 1.8
12 13.27 13 24 23.48 2.7 2.3
14 15.27 15 28 27.48 2.7 2.3
16 17.27 17 30 29.48 3.3 2.7
20 21.33 21 37 36.38 3.3 2.7
24 25.33 25 44 43.38 4.3 3.7
30 31.39 31 56 55.26 4.3 3.7
36 37.62 37 66 64.8 5.6 4.4
ID OD
TH
Steel Stainless
Description A thin, flat circular part with a centrally located hole. Class 300 HV washers are also hardened and tempered.
Applications/Advantages
Washers are for assembly around a bolt or screw, between thebearing surface of the fastener and the part to which it is
attached. Flat washers are used to improve stress distribution,and to span large clearance holes.
Class 140 HV & Class 200 HV metric washers meet the majorityof industrial applications in manufacturing, maintenance and
repair.Class 300 HV metric washers are best suited for use with
through-hardened cap-screws, bolts and nuts.
Washers are for assembly around a bolt or screw, between thebearing surface of the fastener and the part to which it is attached.Flat washers are used to improve stress distribution, and to span
large clearance holes.Stainless washers are for use with austenitic stainless steel screwsand nuts in general industrial applications where parts are subject
to corrosion.
Material Low or medium carbon steel Austenitic stainless steel
HardnessClass 140 HV: HV 140 minimum (Rockwell B 75 minimum)
Class 200 HV: HV 200-300 (Rockwell B 91.5 - C 29.8)Class 300 HV: HV 300-400 (Rockwell C 29.8 - 40.8)
Class A 140: HV 140 minimum (Rockwell B 75 minimum)Class A 200: HV 200-300 (Rockwell B 91.5 - C 29.8)
Class A 350: HV 350-400 (Rockwell C 35.5 - 40.8)
Plating See Appendix-A for information about the plating of flat washers.
347
METRIC - FLAT WASHERS, WIDER I.D. (NORMAL SERIES, GRADE C) ISO 7091
Nominal Size
ID OD T
Internal Diameter Outside Diameter Thickness
Max Min Max Min Max Min
5 5.8 5.5 10 9.1 1.2 0.8
6 6.96 6.6 12 10.9 1.9 1.3
8 9.36 9 16 14.9 1.9 1.3
10 11.43 11 20 18.7 2.3 1.7
12 13.93 13.5 24 22.7 2.8 2.2
14 15.93 15.5 28 26.7 2.8 2.2
16 17.93 17.5 30 28.7 3.6 2.4
20 22.52 22 37 35.4 3.6 2.4
24 26.52 26 44 42.4 4.6 3.4
30 33.62 33 56 54.1 4.6 3.4
36 40 39 66 64.1 6 4
METRIC WashersFlat Washers -Wider I.D.
ID OD
TH
Description A thin, flat circular part with a centrally located hole which is approximately 6% wider than the hole of a like-sized standard metric flatwasher.
Applications/Advantages
Washers are for assembly around a bolt or screw, between the bearing surface of the fastener and the part to which it is attached. Flatwashers are used to improve stress distribution, and to span large clearance holes. The wider-ID style is ideal for use with bolts which
have over-sized shoulder or body diameters.
Material Low or medium carbon steel
Hardness HV 100 minimum (Rockwell B 56.2 minimum)
Plating See Appendix-A for information about the plating of flat washers.
348
Washers METRIC Flat WashersLarge O.D.
METRIC - FLAT WASHERS, LARGE O.D. (LARGE SERIES, GRADES A & C) ISO 7093
Nominal Size
ID OD T
Internal Diameter Outside Diameter Thickness
Max Min Max Min Max Min
3 3.38 3.2 9 8.64 0.9 0.7
3.5 3.88 3.7 11 10.57 0.9 0.7
4 4.48 4.3 12 11.57 1.1 0.9
5 5.48 5.3 15 14.57 1.4 1
6 6.62 6.4 18 17.57 1.8 1.4
8 8.62 8.4 24 23.48 2.2 1.8
10 10.77 10.5 30 29.48 2.7 2.3
12 13.27 13 37 36.38 3.3 2.7
14 15.27 15 44 43.38 3.3 2.7
16 17.27 17 50 49.38 3.3 2.7
20 22.52 22 60 58.1 4.6 3.4
24 26.84 26 72 70.1 6 4
30 34 33 92 89.8 7 5
36 40 39 110 107.8 9.2 6.8
ID OD
TH
Steel Stainless
Description A thin, flat circular part with a centrally located hole with outside diameter three times the nominal thread diameter of the bolt to beused with it. Class 300 HV washers are also hardened and tempered.
Applications/Advantages
Washers are for assembly around a bolt or screw, between thebearing surface of the fastener and the part to which it is attached.Flat washers are used to improve stress distribution, and to spanlarge clearance holes. This style washer is most similar to inch-
sized fender washers.
Washers are for assembly around a bolt or screw, between thebearing surface of the fastener and the part to which it is attached.Flat washers are used to improve stress distribution, and to spanlarge clearance holes. This style washer is most similar to inch-
sized fender washers.Stainless washers are for use with austenitic stainless steel screwsand nuts in general industrial applications where parts are subject
to corrosion.
Material Low or medium carbon steel Austenitic stainless steel
Plating See Appendix-A for information about the plating of flat washers.
349
METRIC WashersFlat Washers -Small O.D.
ID OD
TH
Steel Stainless
Description
A thin, flat circular part with a centrally located hole. The outsidediameter of this variety washer is approximately 7-12% smaller
than that of a like-sized standard flat washer. Class 300 HVwashers are also hardened and tempered.
A thin, flat circular part with a centrally located hole. The outsidediameter of this variety washer is approximately 7-12% smaller
than that of a like-sized standard flat washer.
Applications/Advantages
Washers are for assembly around a bolt or screw, between thebearing surface of the fastener and the part to which it is attached.Flat washers are used to improve stress distribution, and to spanlarge clearance holes. The small outside diameter variety is used
in applications with limited clearance areas on the bearing surface.Class 140 HV & Class 200 HV metric washers meet the majority
of industrial applications in manufacturing, maintenance andrepair.
Class 300 HV metric washers are best suited for use with through-hardened cap-screws, bolts and nuts.
Washers are for assembly around a bolt or screw, between thebearing surface of the fastener and the part to which it is attached.Flat washers are used to improve stress distribution, and to span
large clearance holes. The small outside diameter variety is used inapplications with limited clearance areas on the bearing surface.
Stainless washers are for use with austenitic stainless steel screwsand nuts in general industrial applications where parts are subject
to corrosion.
Material Low or medium carbon steel Austenitic stainless steel
HardnessClass 140 HV: HV 140 minimum (Rockwell B 75 minimum)
Class 200 HV: HV 200-300 (Rockwell B 91.5 - C 29.8)Class 300 HV: HV 300-400 (Rockwell C 29.8 - 40.8)
Class A 140: HV 140 minimum (Rockwell B 75 minimum)Class A 200: HV 200-300 (Rockwell B 91.5 - C 29.8)Class A 350: HV 350-400 (Rockwell C 35.5 - 40.8)
Plating See Appendix-A for information about the plating of flat washers.
METRIC - FLAT WASHERS, SMALL O.D. (SMALL SERIES , GRADE A) ISO 7092
Nominal Size
ID OD T
Internal Diameter Outside Diameter Thickness
Max Min Max Min Max Min
1.6 1.84 1.7 3.5 3.2 0.35 0.25
2 2.34 2.2 4.5 4.2 0.35 0.25
2.5 2.84 2.7 5 4.7 0.55 0.45
3 3.38 3.2 6 5.7 0.55 0.45
3.5 3.88 3.7 7 6.64 0.55 0.45
4 4.48 4.3 8 7.64 0.55 0.45
5 5.48 5.3 9 8.64 1.1 0.9
6 6.62 6.4 11 10.57 1.8 1.4
8 8.62 8.4 15 14.57 1.8 1.4
10 10.77 10.5 18 17.57 1.8 1.4
12 13.27 13 20 19.48 2.7 2.3
14 15.27 15 24 23.48 2.7 2.3
16 17.27 17 28 27.48 2.7 2.3
20 21.33 21 34 33.38 3.3 2.7
24 25.33 25 39 38.38 4.3 3.7
30 31.33 31 50 49.38 4.3 3.7
36 37.62 37 60 58.8 5.6 4.4
350
Washers METRIC External ToothLockwasher
B
AC
Description A hardened circular washer with twisted prongs or "teeth" which extend out from the outer edge of the washer.
Applications/Advantages
This is the most preferable of all tooth-lock washers. It offers the greatest locking efficiency since the teeth are on the largestradius and provide greater torsional resistance.
Material Spring steel
Hardness Rockwell C41 - 47
Plating See Appendix-A for information on the plating of steel lock washers.
METRIC - EXTERNAL TOOTH LOCKWASHERDIN 6797 A;JIS B 1255
Nominal Size
A B CPreferred
Number ofTeeth*
Inside Diameter Outside Diameter Thickness
Max Min Max Min Max Min
M3 3.4 3.2 6.5 6.1 0.485 0.415 8
M3.5 3.9 3.7 7.5 7.1 0.485 0.415 8
M4 4.5 4.3 8.5 8.1 0.485 0.415 9
M5 5.5 5.3 10 9.6 0.64 0.56 10
M6 6.7 6.4 11 10.5 0.64 0.56 12
M8 8.7 8.4 15 14.5 0.85 0.75 12
M10 10.9 10.5 18 17.5 0.95 0.85 12
M12 12.9 12.5 21 20.4 1.055 0.945 12
M14 14.9 14.5 23 22.4 1.055 0.945 12
M16 16.9 16.5 26 25.4 1.265 1.135 14
M20 21.5 21 32 31.2 1.47 1.33 14
* Slight deviation from the preferred number of teeth is permitted.
351
BA
C
Description A hardened circular washer with twisted prongs or "teeth" which extend inward from the inside edge of the washer.
Applications/Advantages
This is preferred when finished appearance is crucial and the teeth must be hidden under the head of the screw; also recommendedfor use with small heads such as fillisters.
Material Spring steel
Hardness Rockwell C41 - 47
Plating See Appendix-A for information on the plating of steel lock washers.
METRIC - INTERNAL TOOTH LOCKWASHERSDIN 6797 J;JIS B 1255
Nominal Size
A B CPreferred
Number ofTeeth*
Inside Diameter Outside Diameter Thickness
Max Min Max Min Max Min
M2 2.4 2.2 4.8 4.5 0.325 0.275 7
M2.5 2.9 2.7 5.7 5.4 0.325 0.275 7
M3 3.4 3.2 6.5 6.1 0.485 0.415 8
M3.5 3.9 3.7 7.5 7.1 0.485 0.415 8
M4 4.5 4.3 8.5 8.1 0.485 0.415 8
M5 5.5 5.3 10 9.6 0.64 0.56 8
M6 6.7 6.4 11 10.5 0.64 0.56 9
M8 8.7 8.4 15 14.5 0.85 0.75 9
M10 10.9 10.5 18 17.5 0.95 0.85 9
M12 12.9 12.5 21 20.4 1.055 0.945 10
M14 14.9 14.5 23 22.4 1.055 0.945 10
M16 16.9 16.5 26 25.4 1.265 1.135 12
M20 21.5 21 32 31.2 1.47 1.33 12
METRIC WashersInternal ToothLockwasher
* Slight deviation from the preferred number of teeth is permitted.
Description An external tooth lock washer with a conical shaped bearing surface.
Applications/Advantages Designed for use with flat or oval head metric screws with countersunk angles of 82° or 100°.
Material Spring steel
Hardness Rockwell C36 - 42
Plating See Appendix-A for information on the plating of steel lock washers.
* Slight deviation from the preferred number of teeth is permitted.
METRIC - COUNTERSUNK EXTERNAL TOOTH LOCKWASHERSDIN 6797 V;JIS B 1255
Nominal Size
A B C DPreferredNumber of
Teeth*Inside Diameter Outside
DiameterThickness Length
Max Min Approx Max Min Max
M3 3.4 3.2 6 0.43 0.37 1.8 8
M4 4.5 4.3 8 0.43 0.37 2.5 8
M5 5.5 5.3 10 0.535 0.465 3.1 9
M6 6.7 6.4 12 0.535 0.465 3.8 10
M8 8.7 8.4 16 0.64 0.56 5.1 12
353
BA
C
Description A hardened circular washer with twisted prongs or teeth protruding from both the inside and outer edges of the washer.
Applications/Advantages
Preferred lockwasher for use with metric screws in the following situations: (1) where a larger bearing surface is desired; (2) for anoptimum electrical connection; (3) where the hole is oversized or out of round; (4) as an insert between two adjustable pieces
where a longitudinal or rotational adjustment must be maintained.
Material Spring steel
Hardness Rockwell C 36 - 42
Plating See Appendix-A for information about the plating of steel lock washers.
Description A coiled, hardened, split circular washer with a slightly trapezoidal wire section, for use with metric screws.
Applications/Advantages
(A) Applies greater bolt tension per unit of applied torque; (B) Provides a hardened bearing surface, creating more uniform torquecontrol; (C) Provides more uniform load distribution; (D) Resists loosening caused by vibration and corrosion;
(E) Is preferred lockwasher for use with hardened bearing surfaces.
Material Spring steel
Hardness Rockwell C 44 - 51
Plating See Appendix-A for information about the plating of carbon steel and alloy steel lock washers.
W
T A B
355
METRIC WashersCurved SpringLockwasher
Description A coiled, hardened, split circular washer with a wave-shaped wire section, for use with metric screws.
Applications/Advantages
Offers more resistance to vibration than helical split lock washers. Can be used in both left hand and right hand boltingconnections.
Material Spring steel
Hardness Rockwell C 44 - 51
Plating See Appendix-A for information about the plating of carbon steel and alloy steel lock washers.
A B
T
W
RC
C<T min.
C
HH
METRIC - CURVED SPRING LOCKWASHERSDIN 128A
& 128B
NominalWasher
Size
A B H W T R
Inside DiameterOutsideDiameter Total Wave Height Section Width Section Thickness Radius
Max Min Max Max Min Max Min Max Min Ref
M2 2.4 2.1 4.4 0.9 0.7 1.0 0.8 0.6 0.4 0.1
M2.3 2.7 2.4 4.9 1.1 0.9 1.1 0.9 0.7 0.5 0.1
M2.5 2.9 2.6 5.1 1.1 0.9 1.1 0.9 0.7 0.5 0.1
M2.6 3.0 2.7 5.2 1.1 0.9 1.1 0.9 0.7 0.5 0.1
M3 3.4 3.1 6.2 1.3 1.1 1.4 1.2 0.8 0.6 0.1
M3.5 3.9 3.6 6.7 1.3 1.1 1.4 1.2 0.8 0.6 0.1
M4 4.4 4.1 7.6 1.4 1.2 1.6 1.4 0.9 0.7 0.2
M5 5.4 5.1 9.2 1.7 1.5 1.9 1.7 1.1 0.9 0.2
M6 6.5 6.1 11.8 2.2 2.0 2.65 2.35 1.4 1.2 0.3
M7 7.5 7.1 12.8 2.2 2.0 2.65 2.35 1.4 1.2 0.3
M8 8.6 8.2 14.9 2.75 2.45 3.15 2.85 1.7 1.5 0.5
M10 10.7 10.2 18.1 3.15 2.85 3.7 3.3 1.9 1.7 0.5
356
Sockets METRIC Socket CapScrews
METRIC - SOCKET HEAD CAP SCREWS, CLASS 12.9 ISO 4762
BasicScrew
Diameter
ThreadPitch
D H K C F S E T W
Body DiameterHead
DiameterHead Height
TopChamfer
or Radius
FilletTransitionDiameter
Socket SizeAcross the Flats
Socket SizeAcross the
Corners
KeyEngage-
ment
WallThick--ness
Max Min Max Min Max Min Max Max Max Min Min Min Min
Description An externally threaded fastener with metric threads, a cylindrical head with a flat chamfered top surface, knurled cylindrical sides andhexagonal recess, made from alloy steel.
Applications/Advantages
Class 12.9 socket cap screws are comparable, but not exactly equivalent to U.S. alloy steel socket cap screws. Ideal for precision assemblywork with close tolerances and applications needing a well-tooled appearance. Supplies greater tensile strength than equivalent sizes of
Class 8.8 or 10.9 hex head cap screws while requiring less surface area or conterbore since the fastener is internally wrenched.
MaterialClass 12.9 socket cap screws shall be made from an alloy steel which conforms to the following chemical composition requirements--
Carbon: 0.20-0.50%; Phosphorous: 0.035% maximum; Sulfur: 0.035% maximum; and one or more of chromium, nickel, molybdenum orvanadium.
Heat Treatment Class 12.9 socket cap screws shall be heat treated by quenching in oil from above the transformation temperature and reheating to atempering temperature of 380°C minimum.
Plating Metric Class 12.9 socket cap screws are usually supplied with a plain, black finish.
357
Description Has a similar design as a metric socket button head screw but has an 82° countersunk flat head.
Applications/Advantages
Used when a flush mounting, high strength screw is required. Commonly used in tools and dies where moving parts pass over thefastened area.
Material Class 10.9 socket flat head cap screws shall be made from an alloy steel which conforms to the following chemical compositionrequirements-- Carbon: 0.28-0.50%; Phosphorous: 0.035% maximum; Sulfur: 0.035% maximum.
Heat Treatment Class 10.9 socket flat head cap screws shall be heat treated by quenching in oil from above the transformation temperature andreheating to a tempering temperature of 380°C minimum.
Tolerance on Length Up to 16mm, incl.: ±0.3 Over 16mm to 60mm, incl.: ±0.5 Over 60mm to 150mm, incl.: ±0.8
358
Cone PointMETRIC Socket Set ScrewsSockets
METRIC - SOCKET SET SCREWS, CONE POINT ISO 4027 & 898/5
NominalSize
ThreadPitch
C E SScrews
Below thisLength areShort Sizes
TMin Length
of Screwfor Torque
Test
TestTorquePoint
Diameter
Socket SizeAcrossCorners
Socket SizeAcross the Flats
Key Engagement (Min)
Max Min Max Min Short Sizes Long Sizes N. m
M1.6 0.35 0.4 0.803 0.724 0.711 3 0.7 1.5 - -
M2 0.4 0.5 1.003 0.902 0.889 3 0.8 1.7 - -
M2.5 0.45 0.65 1.427 1.295 1.270 4 1.2 2 - -
M3 0.5 0.75 1.73 1.545 1.520 4 1.2 2 5 0.9
M4 0.7 1 2.3 2.045 2.020 5 1.5 2.5 6 2.5
M5 0.8 1.25 2.87 2.560 2.520 6 2 3 8 5
M6 1 1.5 3.44 3.071 3.020 8 2 3.5 8 8.5
M8 1.25 2 4.58 4.084 4.020 10 3 5 10 20
M10 1.5 2.5 5.72 5.084 5.020 12 4 6 12 40
M12 1.75 3 6.86 6.095 6.020 16 4.8 8 16 65
M16 2 4 9.15 8.115 8.025 20 6.4 10 20 160
M20 2.5 5 11.43 10.115 10.025 25 8 12 20 310
M24 3 6 13.72 12.142 12.032 30 10 15 25 520
Tolerance on Length2-3mm: ±0.2 4-6mm: ±0.24 8-10mm: ±0.29 12-16mm: ±0.35
20-30mm: ±0.42 35-50mm: ±0.5 55-60mm: ±0.6
Description A headless screw threaded the entire length with a metric thread pitch. It has a sharp conical-shaped point at the opposite end fromthe hexagonal drive.
Applications/Advantages
Cone point set screws are for permanent setting on soft or hardened shafts. The deep penetration it offers gives this style set screwthe highest torsional & axial holding power. Can also be used as a pivot or hanger.
MaterialMetric socket set screws shall be made from an alloy steel which conforms to the following chemical composition requirements--
Carbon: 0.19-0.50%; Phosphorous: 0.05% maximum; Sulfur: 0.05% maximum; Lead: 0.35% maximum. Set screws shall also containone or more of these following elements: chromium, nickel, molybdenum, vanadium or boron.
Heat Treatment Metric socket set screws shall be heat treated by quenching in oil from above the transformation temperature and then tempered byreheating to meet the hardness requirements listed below.
Torsional Strength Metric socket set screws of a sufficient length to be tested (as listed in the above table) shall withstand application of the test torquespecified in said table without evidence of the socket reaming or the screw bursting.
Plating Metric socket set screws are usually supplied with a thermal black finish.
T
CONE POINT
E
S
C
90(120 for short sizes)
o
o
120 for short sizes90 for all other sizes
o
o
359
T
C
FLAT POINT
E
S
90(120 for short sizes)
o
o
Description A headless screw threaded the entire length with a metric thread pitch. It has a flat surface at the end opposite that of the hexagonaldrive.
Applications/Advantages
Flat point set screws are designed for frequent resetting or relocating on hard steel shafts and where minimal damage to shafts is aconcern.
MaterialMetric socket set screws shall be made from an alloy steel which conforms to the following chemical composition requirements--
Carbon: 0.19-0.50%; Phosphorous: 0.05% maximum; Sulfur: 0.05% maximum; Lead: 0.35% maximum. Set screws shall also containone or more of these following elements: chromium, nickel, molybdenum, vanadium or boron.
Heat Treatment Metric socket set screws shall be heat treated by quenching in oil from above the transformation temperature and then tempered byreheating to meet the hardness requirements listed below.
Torsional Strength Metric socket set screws of a sufficient length to be tested (as listed in the above table) shall withstand application of the test torquespecified in said table without evidence of the socket reaming or the screw bursting.
Plating Metric socket set screws are usually supplied with a thermal black finish.
SocketsMETRIC Socket Set ScrewsFlat Point
METRIC - SOCKET SET SCREW, FLAT POINT ISO 4026 & 898/5
Tolerance on Length2-3mm: ±0.2 4-6mm: ±0.24 8-10mm: ±0.29 12-16mm: ±0.35
20-30mm: ±0.42 35-50mm: ±0.5 55-60mm: ±0.6
Description A headless screw threaded the entire length with a metric thread pitch. It has a hexagonal drive at one end and a cup-shapedindentation at the other end.
Applications/Advantages
The cup point is the most popular type of set screw, designed for fast, permanent and semi-permanent location of parts on shafts withhardness differential of 10-15 Rockwell C points and where cutting in of cup edge on the shaft is acceptable.
MaterialMetric socket set screws shall be made from an alloy steel which conforms to the following chemical composition requirements--
Carbon: 0.19-0.50%; Phosphorous: 0.05% maximum; Sulfur: 0.05% maximum; Lead: 0.35% maximum. Set screws shall also containone or more of these following elements: chromium, nickel, molybdenum, vanadium or boron.
Heat Treatment Metric socket set screws shall be heat treated by quenching in oil from above the transformation temperature and then tempered byreheating to meet the hardness requirements listed below.
Torsional Strength Metric socket set screws of a sufficient length to be tested (as listed in the above table) shall withstand application of the test torquespecified in said table without evidence of the socket reaming or the screw bursting.
Plating Metric socket set screws are usually supplied with a thermal black finish.
C
CUP POINT
120˚
SLIGHT FLAT OR
ROUNDING PERMISSIBLE
E
S
T90
(120 for short sizes)o
o
361
Description A headless screw threaded the entire length with a metric thread pitch. It has a protruding tip with a flat surface at the end oppositethat of the hexagonal drive..
Applications/Advantages
Dog point set screws are intended for permanent setting. The point should fit closely to the diameter of the drilled hole or against theflat. Often used instead of a dowel pin.
MaterialMetric socket set screws shall be made from an alloy steel which conforms to the following chemical composition requirements--
Carbon: 0.19-0.50%; Phosphorous: 0.05% maximum; Sulfur: 0.05% maximum; Lead: 0.35% maximum. Set screws shall also containone or more of these following elements: chromium, nickel, molybdenum, vanadium or boron.
Heat Treatment Metric socket set screws shall be heat treated by quenching in oil from above the transformation temperature and then tempered byreheating to meet the hardness requirements listed below.
Torsional Strength Metric socket set screws of a sufficient length to be tested (as listed in the above table) shall withstand application of the test torquespecified in said table without evidence of the socket reaming or the screw bursting.
Plating Metric socket set screws are usually supplied with a thermal black finish.
Description A hex socket screw with metric threads, an enlarged, unthreaded, cylindrical shoulder under the head, the diameter of which serves asthe basis for the derivation of the nominal size.
Applications/Advantages
Class 12.9 socket shoulder screws are comparable, but not exactly equivalent to U.S. alloy steel socket cap screws. Intended forrotation or sliding applications such as pulley shafts, in punch and die work, or for use as a bearing pin.
MaterialClass 12.9 socket shoulder screws shall be made from an alloy steel which conforms to the following chemical composition
requirements-- Carbon: 0.20-0.50%; Phosphorous: 0.035% maximum; Sulfur: 0.035% maximum; and one or more of chromium,nickel, molybdenum or vanadium.
Heat TreatmentClass 12.9 socket shoulder screws shall be heat treated by quenching in oil from above the transformation temperature and reheating
to a tempering temperature of 380°C minimum.
Hardness Rockwell C 39 - 44
Proof Load 1100 N/mm2 minimum
Elongation 8% minimum
Plating Metric Class 12.9 socket shoulder screws are usually supplied with a plain finish.
Socket ShoulderScrews
‡Length of a socket shoulder screw is measured from the underhead bearing surface to the plane of the shoulder at the threaded end.
‡
HT
K
SEE DETAIL Y
A D
SEE DETAIL Z
G
E
D1
L±.005
E
S
363
SocketsMETRICSocket ShoulderScrews
F
ENLARGED DETAIL Y ENLARGED DETAIL Z
I
THIS DIA NOT TO
EXCEED MAJOR
DIA OF THREAD
METRIC - SOCKET SHOULDER SCREWS (CONTINUED) ISO 7379
Description Has a similar thread design as a metric socket cap screw but is fully threaded to the head. The dome shaped head is wider and has alower profile than a socket cap screw.
Applications/Advantages
Used when a wider bearing surface or a smoother, more finished appearance is desired, or in material too thin to accomodate acountersunk head. Button head cap screws do not afford the strength of socket head cap screws and are designed for light fastening
applications.
Material
Class 10.9 button head cap screws may be made from a carbon steel, which conforms to the following chemical compositionrequirements-- Carbon: 0.25-0.55%; Phosphorous: 0.035% maximum; Sulfur: 0.035% maximum.
Class 10.9 button head cap screws may be made from a carbon steel with additives such as Boron, Manganese or Chromium whichconforms to the following chemical composition requirements--
Class 10.9 button head cap screws may be made from an alloy steel which contains one or more of the following: Chromium, Nickel,Molybdenum or Vanadium; and conforms to the following chemical composition requirements--
Heat Treatment Class 10.9 button head cap screws shall be heat treated by quenching in oil from above the transformation temperature and reheatingto a tempering temperature of 425°C minimum.