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
Notice In the case of galvanised screw plugs and screw plugs made of stainless steel the inner thread and
outer thread have to be greased thorough before mounting in order to prevent threads from seizing.
Notice The manufacturer recommends tightening screws with wedge lock washers according to the table
three times after another with the same tightening torque.
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 3999 558 313 280 370 135
M 24 322 687 960 540 455 605 360
Tab.33: 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
Notice In the case of galvanised screw plugs and screw plugs made of stainless steel the inner thread and
outer thread have to be greased thorough before mounting in order to prevent threads from seizing.
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.34: Tightening torques, thread measured in inches
58
OIK 09en-GB Edition 2019-11
Operating instructions
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