Appendix
- 152 -
z
Standard bolt tightening torque table
Refer to the following table for bolts other then described above.
Others :
1. The above torque rating have been determined to 70 % or so of the limit value for bolt elasticity.
2. Tension is calculated by multiplying tensile strength by cross section of thread.
3. Special screws should be tightened to 85 % or so of the standard value.
For example, a screw coated with MoS
2
should be tightened to 60 % or so of the standard value.
Diameter
×
pitch (mm)
Degree of strength
3.6 4.6 4.8 5.6 5.8 6.6 6.8 6.9 8.8 10.9 12.9
(4A) (4D) (4S) (5D) (5S) (6D) (6S) (6G) (8G) (10K) (12K)
Limit value for elasticity (kg/mm
2
)
20 24 32 30 40 36 48 54 64 90 108
Tightening torque (kg
⋅
m)
M5 0.15 0.16 0.25 0.22 0.31 0.28 0.43 0.48 0.5 0.75 0.9
M6 0.28 0.30 0.45 0.4 0.55 0.47 0.77 0.85 0.9 1.25 0.5
M7 0.43 0.46 0.7 0.63 0.83 0.78 1.2 1.3 1.4 1.95 2.35
M8 0.7 0.75 1.1 1 1.4 1.25 1.9 2.1 2.2 3.1 3.8
M8 × 1 0.73 0.8 1.2 1.1 1.5 1.34 2.1 2.3 2.4 3.35 4.1
M10 1.35 1.4 2.2 1.9 2.7 2.35 3.7 4.2 4.4 6.2 7.4
M10 × 1 1.5 1.6 2.5 2.1 3.1 2.8 4.3 4.9 5 7 8.4
M12 2.4 2.5 3.7 3.3 4.7 4.2 6.3 7.2 7.5 10.5 12.5
M12 × 1.5 2.55 2.7 4 3.5 5 4.6 6.8 7.7 8 11.2 13.4
M14 3.7 3.9 6 5.2 7.5 7 10 11.5 12 17 20
M14 × 1.5 4.1 4.3 6.6 5.7 8.3 7.5 11.1 12.5 13 18.5 22
M16 5.6 6 9 8 11.5 10.5 17.9 18.5 18 26 31
M16 × 1.5 6.2 6.5 9.7 8.6 12.5 11.3 17 19.5 20 28 33
M18 7.8 8.312.511 1614.52124.225 36 43
M18 × 1.5 9.1 9.5 14.5 12.5 18.5 16.7 24.5 27.5 28 41 49
M20 11.5121816221931.53536 51 60
M20 × 1.5 12.8 13.5 20.5 18 25 22.5 35 39.5 41 58 68
M22 15.51624.5213026424649 67 75
M22 × 1.5 1718.528243429475256 75 85
M24 20.521.533274034555863 82 92
M24 × 1.5 23 2537314538616774 93 103
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