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TAPTITE® screws were the leap forwardin high production assembly usingthreaded fasteners. DUO-TAPTITE®
screws represent the refinement ofthe TRILOBULAR™ principle forspecific demanding applications.
DUO-TAPTITE® screws have generouslobulation at the screw point for easyentry and optimum thread formingaction plus reduced lobulation in thescrew body holding area. A stabilizingthreaded dog point insures ready,aligned entry, with easy pick-uprequiring minimal starting end load.
ADVANTAGES• High vibrational resistance• Good axial alignment• Low end load• High strip-to-drive ratio• High prevailing torque• Good torque tension relationship
6.
DUO-TAPTITE® Fasteners
1
B – Higher prevailing torqueSuperior elastic action of a DUO-TAPTITE®
screw gives it better locking charac-teristics than many fasteners specificallydesigned as locking screws!Competitive round-bodied, thread-forming fasteners have no lockingtorque. Graph shows comparisonof a DUO-TAPTITE® screw with theIFI-124 minimum requirement forself-locking screws.
2˚1˚2˚2˚
* Starting angle of four specimens of each type measured at20X full size on an optical comparator
DUO-TAPTITECOMPETITIVE
ROUND-BODIED
THREAD-FORMING SCREW
5˚3˚4˚3˚
TYPICAL ANGULARITY
3.0 5.0 7.0 9.0 11.0
DUO-TAPTITE
COMPETITIVE ROUND-BODIEDTHREAD-FORMING SCREW
Result is an average of samples tested
20 40 60
DUO-TAPTITE
IFI
Result is an average of samples tested
PREVAILING LOCKING TORQUE: POUND-INCHES
DUO-TAPTITE
TAPTITE
30
25
20
15
10
5
10 20 30 40 50 60
TORQUE (Newton Metres)
TE
NS
ION
(Kil
o N
ew
ton
s)
NOTE: This graph represents a linear calculation based onstatistical data of the respective screws
Lower starting end pressureLower starting end pressure combineswith lower driving torque to reducetime and power costs right down the line.
A – Higher strip-to-drive ratioThe higher, more uniform, strip-to-drive torque ratio of DUO-TAPTITE®
vs. TAPTITE® FastenerSuperior tension at any given appliedtorque (with normal clamping pressure)is a major factor in the better holdingcapability of a DUO-TAPTITE® screw.
NOTE: All screws were tested in unthreaded weld nutsof uniform hardness (Rockwell B 82-84) having 7.1mmhole diameters. End pressure was manually devel-oped, measured and recorded by an electronic loadcell and recorder. Drive, prevailing and strip torquevalues, and torque-tension values were measuredwith a GSE torque cell and recorded on a BLH elec-tronic recorder. All test data is based on 5/16 - 18 orM8 x 1.25 screws.
Better starting stability –
Axial alignmentLess misalignment at start of drivingoperation . . . the self-aligning characteristicofDUO-TAPTITE® screws reduces operatorfatigue; eliminates interruptionsin production; adds speed to everyfastening operation. Suitable for automatedand robotic assembly.
7.
DUO-TAPTITE® Fasteners
2.0 3.0 4.0 5.0 6.0
DUO-TAPTITE
COMPETITIVE ROUND-BODIEDTHREAD-FORMING SCREW
Result is an average of samples tested 2
DUO-TAPTITE® fasteners, and/or their
manufacture according to REMINC
specifications, covered by one or more
of the following patents:
6,089,806, 6,089,986, 6,261,040.
8.
Hole Size Information
Suggested hole sizes for TAPTITE II®, DUO-TAPTITE® and TAPTITE® CA
Screws and Bolts at various percentages of thread engagement
EXAMPLE – The shaded area indicates that an M5 – 0.8 screw size in a 4.58 hole size provides 80% thread engagement.
Because the above values are based on a linear relation between hole size and percentage thread engagement, the hole data becomes less accurate for engagements less than 70%.
Note also, these holes are based on the U.S. basic thread depth of .6495 times the pitch and are calculated using nominal screw diameters.Hole = D - (0.6495 x P x %), where D = nominal screw diameter.
(1) Pilot holes listed under 90% & 85% (Thread Percent) also recommended for single punch extruded holes. - See Page 11
For Pilot Hole Tolerance in terms of thread percentage, we suggest +5% to -10% of the nominal, percent thread value.
EXAMPLE; If 80% is the percent thread for the nominal hole, the minimum hole would yield 85% thread andthe maximum hole would yield 70% thread.
3
9.
Hole Size Information
Recommended pilot hole sizes for TAPTITE II®, DUO-TAPTITE® and
TAPTITE® CA Screws and Bolts for steel nut member thicknesses
4
Suggested extruded holes in light gauge steel for
TAPTITE II® and DUO-TAPTITE® Screws and Bolts
The areas of the upper chart indicate that an extruded holediameter of .146” to .149” is suggested in .060” thickmaterial when using a number 8-32 TAPTITE II® orDUO-TAPTITE® screw. The corresponding H dimension,shown on Page 12, for this hole will be .053” minimum,making the total length of engagement .113” minimum.
Extruding holes for fasteners in light-gauge steel nearlydoubles the length of thread engagement over originalmaterial thickness.
TAPTITE II® and DUO-TAPTITE® screws and bolts willdevelop almost twice the failure torque in extrudedholes, providing maximum joint integrity.
TAPTITE II® and DUO-TAPTITE® Screws and Bolts (Continued from page 11)
The minimum length of thread engagementshould be equal to twice the diameter of thescrew (to approach utilizing available screwstrength). The hole diameter to ensure optimumperformance should provide for 65% to 75%thread engagement.