Table 9: Tightening Torque Specifications
For non-electrical connections
Thread Ft-lbs maximum torque Nm maximum torque
M4 2.43 3.3
M5 3.25 4.4
M6 6.49 8.8
M8 19.47 26.4
M10 34.10 46.2
M12 56.76 77
For electrical connections
Thread Ft-lbs torque Nm torque
M4 0.6 to 0.9 0.8 to 1.2
M5 1.3 to 1.8 1.3 to 1.8
For metal threaded glands/unions
Thread Ft-lbs maximum torque Nm maximum torque
M12x1.5 3 to 4.5 4 to 6
M16x1.5 3.7 to 5.5 5 to 7.5
M20x1.5 4.4 to 6.6 6 to 9
M32x1.5 5.9 to 8.9 8 to 12
M40x1.5 5.9 to 8.9 8 to 12
For plastic threaded glands/unions
Thread Ft-lbs maximum torque Nm maximum torque
M12x1.5 1.5 to 2.6 2 to 3.5
M16x1.5 2.2 to 3 3 to 4
M20x1.5 3 to 3.7 4 to 5
M32x1.5 3.7 to 5.2 5 to 7
M40x1.5 3.7 to 5.2 5 to 7
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