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.
Appendix - 152 - 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/mm2) 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 8.3 12.5 11 16 14.5 21 24.2 25 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 11.5 12 18 16 22 19 31.5 35 36 51 60 M20 × 1.5 12.8 13.5 20.5 18 25 22.5 35 39.5 41 58 68 M22 15.5 16 24.5 21 30 26 42 46 49 67 75 M22 × 1.5 17 18.5 28 24 34 29 47 52 56 75 85 M24 20.5 21.5 33 27 40 34 55 58 63 82 92 M24 × 1.5 23 25 37 31 45 38 61 67 74 93 103