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Tightening torque values
610.44495.40.310 · 09.2013
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© Gardner Denver Deutschland GmbH
Tightening torque values
The values apply if no other specifications are available.
Stainless steel screws
Mechanical properties A4-70 according to ISO 3506-1.
Thread
[Nm]
[ft lbs]
M5
2,3 – 2,7
1.70 – 2.70
M6
4,2 – 5,0
3.10 – 3.70
M8
7,5 – 9,0
5.55 – 6.65
M10
18 – 22
13.3 – 16.2
M12
35 – 42
25.8 – 31.0
M16
58 – 70
42.8 – 51.6
Steel screws
Tightening torques for non-electrical connections for nuts of strength class 8 and
screws of strength class 8.8 according to ISO 898-1.
Thread
Non-electrical
Electrical*
[Nm]
[ft lbs]
[Nm]
[ft lbs]
M4 ---
---
0,8 - 1,2
0.60 - 0. 90
M5
4,5 - 5,5
3.32 - 4.06
1,8 - 2,5
1.35 - 1.85
M6
8,1 - 9,9
5.98 - 7.31
2,7 - 4,0
2.00 - 3.00
M8
21,6 - 26,4
15.9 – 19.5
--- ---
M10
37,8 – 46,2
27.9 – 34.1
--- ---
M12
63,0 - 77,0
46.5 - 56.8
---
---
M16
63,0 - 77,0
46.5 - 56.8
---
---
* applicable for terminal plate connections, except for terminal strips
Cable and wiring screw connections
Thread
Metal
Plastic
[Nm]
[ft lbs]
[Nm]
[ft lbs]
M12x1.5
4,0 – 6,0
2.95 – 4.42
2,0 – 3,0
1.48 – 2.21
M16x1.5
5,0 – 7,5
3.69 – 5.53
2,0 – 3,0
1.48 – 2.21
M25x1.5
6,0 – 9,0
4.42 – 6.64
2,0 – 3,0
1.48 – 2.21
M32x1.5
8,0 – 12
5.90 – 8.85
4,0 – 6,0
2.95 – 4.42
M40x1.5
8,0 – 12
5.90 – 8.85
4,0 – 6,0
2.95 – 4.42
Pipe thread according to ISO 228-1, EN 10226-1 and NPT thread
Type
[Nm]
[ft lbs]
G 2½ / NPT 2½-8
70 – 110
52 – 81
G 3 / NPT 3-8
80 – 130
59 – 96
G 4 / NPT 4-8
100 – 165
74 – 121
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Tel. 071 918 60 60, Mail: [email protected]