• www.arnold-fastening.com TAPTITE 2000 ® Thread-rolling in metals ˦ low tapping torque ˦ high pre-load forces ˦ high assembly reliability Version published 01.2017 www.arnold-fastening.com ˦ chipless thread-rolling ˦ total cost of fastening reduced by up to 85% ARNOLD-TV presents Just how does thread-tapping in metals work?
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TAPTITE 2000€¦ · compliant with DIN 267-part 30 and DIN 75000-1. Profile of conventional thread-rolling screws ... Thread engagement 100 % 2.21 2.68 3.11 3.55 4.48 5.35 7.19 9.03
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• www.arnold-fastening.com
TAPTITE 2000®
Thread-rolling in metals ˦ low tapping torque ˦ high pre-load forces ˦ high assembly reliability
Version published 01.2017www.arnold-fastening.com
˦ chipless thread-rolling ˦ total cost of fastening
reduced by up to 85%
ARNOLD-TV presents
Just how doesthread-tapping in
metals work?
02
TAPTITE 2000® – Thread-rolling in metals
Faster production, better quality,lower costsTAPTITE 2000® is a thread-tapping screw with outstanding mechanical, fastening and ergonomic character-
istics that no other technology can aspire to. Compared with conventional screws, with TAPTITE 2000® you
can reduce your overall fastening costs by up to 85%, partly because the cost of manufacture is drastically
reduced: Many steps of the process can simply be omitted. The fastener is screwed straight into a cast or
drilled core hole. Done!
Technology in applicationUsing TAPTITE 2000® ensures that in metal-joining applica-tions, you can eliminate work processes such as tapping and
the use of additional fasten-ing elements.
The trilobulare™ cross-section geometry of the shaft of the screw ensures that the thread is chiplessly formed, so that if
a repair is needed it can ac-cept a conventional threaded screw. It also provides sig-nificant quality advantages: low tapping torque, high vibration resistance and high pre-load forces.
Drill/Cast/Punch
Counter-bore
Thread cutting
Cleaning CheckingFastening-/
locking deviceAssembly
Drill/Cast/Punch
You can omit all of these! TAPTITE 2000® Assembly
Fewer steps towards the goal
Process with threaded screw
Process with TAPTITE 2000®
When you use TAPTITE 2000®, it's not just processing time – you also save money on tool and machine usage. For example the machining centre and the washing unit can be omitted for the screw locations, as would be necessary for threaded screws, and there's no need to purchase measuring instru-ments to check gauge sizes, and no additional locking elements are needed either.
Improved security at assemblyDue to the major difference between the low tapping torque (MF) of TAPTITE 2000® and the tightening torque (MA) (Delta MA - MF) you can achieve improved assembly security and higher clamping force.
Angle of rotation [°]
Torq
ue
[Nm
]
low tapping torque
conventional thread-rolling screw
TAPTITE 2000® Delta MF – MA
conventional tapping screw Delta MF – MAmax
Delta MF – MA TAPTITE 2000® M3-10.9 and Delta MF – MA conventional M3-10.9 tapping screw
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Thread profile and cross-section ensure better values
The TAPTITE 2000® thread profile is similar to the involute shape of a gearwheel. Together with the triangular (trilobularen™) cross-section geometry of the screw's shaft, it greatly improves the mechanical properties of the screw fastening:
Radius profile
˦ Less forming effort is required during the thread tapping process and material displacement is lower. The material can flow more easily in the direction of the thread core. The material's grain direction is maintained.
˦ During the strain hardening process, the mechanical values of the material can be increased by around 30%.
˦ chipless thread-forming (no chips are formed as is the case with tapping screws)
Tapping torque halvedWith the unique radius pro-file and the triangular cross-section, the TAPTITE 2000®'s driving torque is up to 50% less than that of conven-tional thread-tapping screws compliant with DIN 267-part 30 and DIN 75000-1.
Profile of conventional thread-rolling screws
Radius profile of TAPTITE 2000®
The optimised thread geometry of TAPTITE 2000® SPA™
Thread cutBy optimising the length of the tapping zone (LF) and the permitted Cp-max. dimen-sion, hole location of the screw can be improved while increasing the number of bearing thread turns.
Tapping zone length (LF) respectively 2.5 - 3.5 x p (pitch)
Intermediate lengths on request.Lengths in brackets should be avoided as far as possible. not for countersunk heads
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Important values
Strength classes
8.8 for all coloured metals and light metal alloys up to Rm = 360 MPa10.9 for all metals up to Rm = 415 MPaE.H. for steel up to RM ~ 600 MPa10.9 Corflex® I for steel up to Rm ~ 600 MPa*
Safety information All screws with
Rm > 1000 MPa
are at risk of hydrogen-induced brittle fracture
Minimum breaking torque Tightening torques depend on the screw's minimum breaking torques (ISO 898 part 7), on tool stability, core hole diameter,
screw-in depth and friction coefficients. These are deter-mined in laboratory trials.
*) 10.9 with inductive hardened tip
Minimum breaking torques in Nm (free torsion break)
Screw fastening into precast core holes in aluminium housings made with TAPTITE 2000® M8 – 10.9
Influence of screw's cross-section on tap-ping torque and preload force
For thread-tapping fastenings in GD-AlSi9Cu3 (Fe) a round screw cross-section generated a tapping torque MF round of 25.7 Nm. Because of the small difference with the tightening torque MA = 34 Nm the preload force Fv-round amounted to only 7.2 kN. At 19.1 kN TAPTITE 2000® with its trilobular screw geometry, achieved a much higher FV-TT2000 preload force with a tapping torque TT2000 of 13.55 Nm and the same tightening torque.Consequently the trilobular TAPTITE 2000® SPA™ has an advantage over tapping screws with a round cross-section – Due to the lower tapping torques and little spread, TAPTITE 2000® generates preload forces at a higher level with very much less preload force spread.
Angle [°]
Torq
ue
[Nm
]
Md-TT2k[Nm]
Fv-Round [kN]
Fv-TT2k [kN]
Md-Round [Nm]
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Note: The values shown are by way of example parameters. Specific values must always be determined by carrying out trials on original production parts. Our Fastener Testing Centre is always happy to answer any further questions you may have.
Cast core hole Drilled core hole
*) recommended, effective penetration depth into aluminium corresponds to 2 x d. (effective penetration depth = penetration depth - length of tapping zone - relief bore depth)
Recommendations for applications in cast aluminium
Cast aluminium core hole
Nominal Ø M2.5 M3 M3.5 M4 M5 M6 M8 M10
cast effective screw-in depth= 2 x d
A 2.32+0.08 2.80+0.08 3.25+0.08 3.70+0.08 4.69+0.08 5.60+0.10 7.55+0.12 9.48+0.12
B 2.22+0.08 2.69+0.08 3.12+0.08 3.55+0.08 4.48+0.08 5.35+0.10 7.19+0.12 9.03+0.12
L 6.8 8.0 9.4 10.8 13.2 16.0 21.0 26.0
Kmin 7.8 9.2 10.6 12.0 14.7 17.5 22.7 27.0
X 5.45 6.50 7.60 8.70 10.80 13.00 17.25 21.50
cast effective screw-in depth= 1.5 x d
A 2.29+0.08 2.78+0.08 3.22+0.08 3.66+0.08 4.64+0.08 5.54+0.10 7.46+0.12 9.37+0.12
B 2.22+0.08 2.69+0.08 3.12+0.08 3.55+0.08 4.48+0.08 5.35+0.10 7.19+0.12 9.03+0.12
L 5.6 6.5 7.7 8.8 10.7 13.0 17.0 21.0
Kmin 6.6 7.7 8.9 10.0 12.2 14.5 18.7 22.8
X 4.20 5.00 5.85 6.70 8.30 10.00 13.25 16.50
cast effective screw-in depth= 1.0 x d
A 2.27+0.08 2.75+0.08 3.19+0.08 3.63+0.08 4.59+0.08 5.48+0.10 7.37+0.12 9.26+0.12
B 2.22+0.08 2.69+0.08 3.12+0.08 3.55+0.08 4.48+0.08 5.35+0.10 7.19+0.12 9.03+0.12
L 4.3 5 5.9 6.08 8.2 10.0 13.0 16.0
Kmin 5.3 6 6.9 7.8 9.2 11.0 14.0 17.0
X 2.95 3.50 4.10 4.70 5.80 7.00 9.25 11.50
additional information for cast holes
C 2.7+0.08 3.2+0.08 3.7+0.08 4.3+0.08 5,3+0.08 6.3+0.08 8.5+0.08 10.5+0.08
t 0.55-0.2 0.60-0.2 0.70-0.2 0.80-0.2 0.90-0.2 1.10-0.2 1.30-0.2 1.70-0.3
Screw fastening into precast core holes made with TAPTITE 2000® M5.
Excellent security during screw-in process.
The TAPTITE 2000® M5 fastening into precast core holes in Mg AZ91 pressure cast was made at tapping torques MF < 3 Nm and overturn torque > 9 Nm. A high level of process reliability is achieved for the screw-in process because of the wide gap between tapping torque and overturn torque.
Angle [°]
Torq
ue
[Nm
]
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Note: The values shown are by way of example parameters. Specific values must always be determined by carrying out trials on original production parts. Our Fastener Testing Centre is always happy to answer any further questions you may have.
Cast core hole Drilled core hole
Installation recommendations for applications in cast magnesium
Cast aluminium core hole
Nominal Ø M2.5 M3 M3.5 M4 M5 M6 M8 M10
cast effective screw-in depth= 2.5 x d
A 2.31+0.08 2.80+0.08 3.25+0.08 3.73+0.08 4.71+0.08 5.62+0.10 7.60+0.12 9.53+0.12
B 2.20+0.08 2,67+0.08 3.10+0.08 3.54+0.08 4.47+0.08 5.33+0.10 7.17+0.12 9.01+0.12
*) recommended, effective penetration depth into aluminium corresponds to 2.5 x d. (effective penetration depth = penetration depth - length of tapping zone - relief bore depth)
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TAPTITE 2000® – Thread-rolling in metals
Application in solid steel
ECO Air COMPACT axis with disc brakes.
Screw fastening for ABS sensor made with TAPTITE 2000® M8 10.9 Corflex® I.
Torque sequence in core hole area 7.40 + 0.1mm in overturn test.
It is possible to make a screw fastening with a typical tightening torque of ~ 30 Nm. Despite the higher strength of the steering knuckle (hardened and tempered to ~ 900 MPa) it is still possible to make a reliable thread-tapping fastening.However additional inductive hardening at the tap-ping zone is necessary.
Angle [°]
Torq
ue
[Nm
]
Torque sequence in core hole area 7.40 + 0.1mm in overturn test
Installation recommendations for applications in solid steel
Screw fastening for fan modules into through-holes in sheet steel using TAPTITE 2000® M5 I.
Secure screw fastenings into sheet steel
Low tapping torques and high tightening torques and overturn torques ensure secure processing for the screw fastening. A high level of component security was achieved by using TAPTITE 2000® strength class 10.9.
Angle [°]
Torq
ue
[Nm
]
Installation recommendations for applications in sheet steel through-holes
Note: The values shown are by way of example parameters. Specific values must always be determined by carrying out trials on original production parts. Our Fastener Testing Centre is always happy to answer any further questions you may have.
14
TAPTITE 2000® – Thread-rolling in metals
TAPTITE 2000® Captive Point ˦ mechanical securing device ˦ pin < core hole diameter ˦ cannot detach after tapping
TAPTITE 2000® with special designs
TAPTITE 2000® CA tip/Extrude-Tite®
˦ for fastening thin sheets ˦ forms a metal through-hole
TAPTITE 2000® Assembly aids ˦ can generally be dispensed with due to the conical section ˦ can be supplied if needed
TAPTITE 2000® anti-theft devices ˦ can generally be dispensed with ˦ the triangular (trilobulare™) shape of TAPTITE creates its own safety lock
˦ if required, mechanical or chemical locking devices can be appliedCup point
Locking toothing
Locking burls
Micro-encapsulation
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Notes
TAPTITE 2000® – Thread-rolling in metals
ARNOLD TECHNIQUE FRANCE S.A.
4, rue St DidierF-26140 AnneyronT +33 475 313260F +33 475 314440
The ARNOLD GROUPWith a foundation of many years of expertise in the production of intelligent fastening systems and very complex ex-truded parts, the ARNOLD GROUP has developed over a number of years into a comprehensive supplier and develop-ment partner for complex fastening systems. With our new positioning of “BlueFastening Systems” this development process will now continue under a united and harmonised structure. Engineering, fastenings, and functional parts, together with feeder processing systems, all from a single source – efficient, sustained and international.