Page 277 - Wieland - revos Industrial multipole connectors

facts&DATA

Tightening torque

Tightening torque of screw connections
Extract from EN 60 947-1
Tightening torque for proving the mechanical tightness of screw connections
Table 4: Tightening torques for proving the mechanical tightness of
screw connections/terminals

Thread diameter Tightening torque (Nm)
Metric standard values Diameter range I II III
1.6 1.6 0.05 0.1 0.1
2.0 1.6 to 2.0 0.1 0.2 0.2
2.5 2.0 to 2.8 0.2 0.4 0.4
3.0 2.8 to 3.0 0.25 0.5 0.5
- 3.0 to 3.2 0.3 0.6 0.6
3.5 3.2 to 3.6 0.4 0.8 0.8
4 3.6 to 4.1 0.7 1.2 1.2
4.5 4.1 to 4.7 0.8 1.8 1.8
5 4.7 to 5.3 0.8 2.0 2.0
6 5.3 to 6.0 1.2 2.5 3.0
8 6.0 to 8.0 2.5 3.5 6.0
10 8.0 to 10.0 - 4.0 10.0
12 10 to 12 - - 14.0
14 12 to 15 - - 19.0
16 15 to 20 - - 25.0
20 20 to 24 - - 36.0
24 24 - - 50.0

Column I: Applies for screws without heads that do not protrude from the thread hole and for screws that can only be tightened with screwdrivers
with an edge narrower than the screw's thread core diameter.
Column II: Applies for nuts and screws that are tightened with screwdrivers.
Column III: Applies for nuts and screws that can be tightened with tools other than screwdrivers.

Subject to change without further notice 277