Q&A（FAQ）
How much is the tightening torque?

Regarding the tightening torque used for terminal block screws, the recommended torque value is shown below.
Evaluation shall be required with your end equipment.

1. For Terminal Block

Table 1. Recommended tightening torque value for Terminal Block
No. Screw diameter Recommended Torque No.
[N·m](sl unit) [kgf](Gravitational system of unit)
1 M3 0.36 - 0.49 3.7 - 5.0
2 M3.5 0.64 - 0.8 6.5 - 8.8
3 M4 1.0 - 1.2 9.6 - 12.8
4 M5 1.9 - 2.4 19.0 - 25.0
5 M6 3.3 - 4.3 33.5 - 44.0
6 M8 8.1 - 10.7 82.0 - 110.0

2. For Mounting hole (Aluminum chassis)

Table2. Recommended tightening torque value for Mounting hole (Aluminum chassis)
No. Screw diameter Recommended T or que No.
[N·m](sl unit) [kgf](Gravitational system of unit)
1 M3 0.36 - 0.49 3.7 - 5.0
2 M3.5 0.64 - 0.8 6.5 - 8.8
3 M4 1.0 - 1.2 9.6 - 12.8
4 M5 1.9 - 2.4 19.0 - 25.0
5 M6 3.3 - 4.3 33.5 - 44.0
6 M8 8.1 - 10.7 82.0 - 110.0

3. For Mounting hole (Steel plate)

Table3. Recommended tightening torque value for Mounting hole (Steel Plate Chassis)
No. Screw diameter Recommended T or que No.
[N·m](sl unit) [kgf](Gravitational system of unit)
1 M3 0.46 - 0.6 4.7 - 6.3
2 M3.5 0.79 - 1.08 8.1 - 11.0
3 M4 1.2 - 1.5 12.0 - 16.0
4 M5 2.4 - 3.0 24.0 - 31.0
5 M6 4.2 - 5.4 42.0 - 56.0
6 M8 10.1 - 13.4 103.0 - 137.0

Technical Product-related Inquires

e-mail:support@cosel.co.jp