17 Appendix
17.1 Tightening torques for screws with metric screw threads with and without wedge lock washers
17 Appendix
17.1 Tightening torques for screws with metric screw threads with and without wedge lock
washers
Tightening torque [Nm]
Screws with head contact surface Countersunk screws
Stainless steel screws A2 and A4
Thread 5.6 8.8 10.9 8.8+
Alu*
Property class
70
Property class 80 8.8
M 3 0.6 1.5 – 1.2 – – 1
M 4 1.4 3.0 4.1 2.3 – – 2
M 5 2.7 6.0 8.0 4.8 3.5 4.7 5
M 6 4.7 10.3 14.0 7.6 6.0 8.0 9
M 8 11.3 25.0 34.0 18.4 16.0 22.0 14
M 10 23.0 47.0 68.0 36.8 32.0 43.0 36
M 12 39.0 84.0 117 64.0 56.0 75.0 60
M 14 62.0 133 186 101 – – 90
M 16 96.0 204 285 155 135 180 100
M 18 133 284 390 224 – – –
M 20 187 399 558 313 280 370 135
M 24 322 687 960 540 455 605 360
Tab.20: Tightening torques metric screw thread
*When screwing into aluminium, the tightening torque reduces by 20% when the screw-in depth is less
than double the thread diameter.
17.2 Tightening torques for screw plugs with thread measured in inches and elastomer
seal
Tightening torque [Nm]
Thread Galvanized + stainless steel
G 1/8" 13.0
G 1/4" 30.0
G 3/8" 60.0
G 1/2" 80.0
G 3/4" 120
G 1" 200
G 1 1/4" 400
G 1 1/2" 450
Tab.21: Tightening torques, thread measured in inches
17.3 Tightening torques and widths for threaded rings
Size Threaded ring/
measuring screw
Item No. Width [mm] Tightening torque [Nm]
052 Large 057.1 22 60
Small 057.2 19 52
068 Large 057.1 32 160
Small 057.2 19 55
Tab.22: Tightening torques and widths for threaded rings
54
OIO 14en-GB Edition 2020-01
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