Appendix
V.. / NV.. / CV..
en-28
2022-D059517
Revision: 05
9.4.2 Continuous operation
9.5
Tightening torques for common thread sizes in general mechanical engineering
The specified tightening torques for headless screws and nuts are calculated values and are based
on the following conditions:
- Calculation according to VDI 2230 (edition 11/2015)
- Friction value for thread and contact surfaces µ=0.10
- Utilization of the yield stress 90%
- Torque tools type II classes A and D in accordance with ISO 6789
The settings are values rounded to usual commercial scale gradations or settings.
Use the
exact
values in this table to set your tools.
When using the gearbox in continuous operation (S1 operation), we
recommend the use of a bleed screw.
The bleed screw is not included in the scope of delivery.
WITTENSTEIN alpha GmbH
offers suitable bleed screws to this end
(see Table "Tbl-24"). If you would like to order a bleed screw, contact our
sales department.
Gearbox size V-Drive
040
050 063 080 100
Material number for
bleed screw
20070677
20071468
(only with ordering code
xxx040x-xxx-xxx-xxx-xx-XDx)
20070677
Thread size
G1/4"
G3/8"
G1/4"
Tbl-24: Bleed screw
Tightening torque [Nm] with thread
Property
class
screw/nut
M3
M4
M5
M6
M8 M10 M12 M14 M16 M18 M20 M22 M24
8.8 / 8
1.15 2.64 5.2
9.0 21.5 42.5 73.5 118 180 258 362 495
625
10.9 / 10
1.68 3.88 7.6 13.2 32.0 62.5 108 173 264 368 520 700
890
12.9 / 12
1.97 4.55 9.0 15.4 37.5 73.5 126 202 310 430 605 820 1040
Tbl-25: Tightening torques for set screws and nuts
