79
3
Load specifications
... for screw connections
Consult the literature to calculate the necessary screw dimensions. The values listed here for max. operating
force and frictional connection include a safety factor of s0 = 2 compared with the max. values given
F
in the literature. The specifications applies at room temperature to screws of strength class 8.8.
F
Connecting Elements
Thread
Min. screw
depth
mm
Pretension
N
Tightening
torque
Nm
Max. static
operating force in
axial direction
N
Max. frictional
connection
N
M 5 ≥ 4 6,000 6 1,800 400
M 6* ≥ 4 6,000 7 1,800 400
M 6 ≥ 6 9,000 10 2,500 630
M 8 ≥ 6 16,500 25 4,000 1,100
M 10 ≥ 8 26,000 49 7,400 1,800
M 12* ≥ 9 26,000 63 8,600 1,800
M 12 ≥ 10 38,300 86 11,300 1,900
* For connections with an M6 nut (Series 25 with 6 mm slot) or M12 nut (Series 60 with 14 mm slot), the pretension and thus the
max. frictional connection and max. operating force must be reduced. This is due to the screw depth of the nut and the max.
permissible surface pressure on the profile.
Safety factors
The following safety factors are recommended depending on the application:
Static or pulsating load: s0 ≥ 2
Alternating load direction: s0 ≥ 3
Dynamic loads: s0 ≥ 4
Vibration and shocks: s0 ≥ 5