TIGHTENING TORQUE SPECIFICATIONS The tightening torque values given in the table below are applicable to the bolts unless otherwise specified.
STANDARD BOLT
kgf·m (lb.ft/N·m)
Strength 4.8 (4T) (7T) 8.8 Class Bolt Refined Non-Refined Identifi- cation
9.8 (9T)
Bolt Diameter x pitch (mm) M6 x 1.0
0.4 - 0.8 (2.9 - 5.8/3.9 - 7.8)
0.5 - 1.0 (3.6 - 7.2/4.9 - 9.8)
M8 x 1.25
0.8 - 1.8 (5.8 - 13.0/7.8 - 17.7)
1.2 - 2.3 (8.7 - 16.6/11.8 - 22.6)
1.7 - 3.1 (12.3 - 22.4/16.7 - 30.4)
M10 x 1.25
2.1 - 3.5 (15.2 - 25.3/20.6 - 34.3)
2.8 - 4.7 (20.3 - 34.0/27.5 - 46.1)
3.8 - 6.4 (27.5 - 46.3/37.3 - 62.8)
M12 x 1.25
5.0 - 7.5 (36.2 - 54.2/49.1 - 73.6)
6.2 - 9.3 (44.8 - 67.3/60.8 - 91.2)
7.7 - 11.6 (55.7 - 83.9/75.5 - 114.0)
M14 x 1.5
7.8 - 11.7 (56.4 - 84.6/76.5 - 115.0)
9.5 - 14.2 (68.7 - 102.7/93.2 - 139.0)
11.6 - 17.4 (83.9 - 125.6/114.0 - 171.0)
M16 x 1.5
10.6 - 16.0 (76.7 - 115.7/104.0 - 157.0)
13.8 - 20.8 (99.8 - 150.4/135.0 - 204.0)
16.3 - 24.5 (118.9 - 177.2/160.0 - 240.0)
M18 x 1.5
15.4 - 23.0 (111.1 - 166.4/151.0 - 226.0)
19.9 - 29.9 (143.9 - 216.3/195.0 - 293.0)
23.4 - 35.2 (169.3 - 254.6/230.0 - 345.0)
M20 x 1.5
21.0 - 31.6 (151.9 - 228.6/206.0 - 310.0)
27.5 - 41.3 (198.9 - 298.7/270.0 - 405.0)
32.3 - 48.5 (233.6 - 350.8/317.0 - 476.0)
M22 x 1.5
25.6 - 42.2 (185.2 - 305.2/251.0 - 414.0)
37.0 - 55.5 (267.6 - 401.4/363.0 - 544.0)
43.3 - 64.9 (313.2 - 469.4/425.0 - 637.0)
M24 x 2.0
36.6 - 55.0 (264.7 - 397.8/359.0 - 540.0)
43.9 - 72.5 (317.5 - 523.9/431.0 - 711.0)
56.5 - 84.7 (408.7 - 612.6/554.0 - 831.0)
*M10 x 1.5
2.0 - 3.4 (14.5 - 24.6/19.6 - 33.4)
2.8 - 4.6 (20.3 - 33.3/27.5 - 45.1)
3.7 - 6.1 (26.8 - 44.1/36.3 - 59.8)
*M12 x 1.75
4.6 - 7.0 (33.3 - 50.6/45.1 - 68.7)
5.8 - 8.6 (42.0 - 62.2/56.9 - 84.4)
7.3 - 10.9 (52.8 - 78.8/71.6 - 107.0)
*M14 x 2.0
7.3 - 10.9 (52.8 - 78.8/71.6 - 107.0)
9.0 - 13.4 (65.1 - 96.9/88.3 - 131.0)
10.9 - 16.3 (78.8 - 118.9/107.0 - 160.0)
*M16 x 2.0
10.2 - 15.2 (73.8 - 110.0/100.0 - 149.0)
13.2 - 19.8 (95.5 - 143.2/129.0 - 194.0)
15.6 - 23.4 (112.8 - 169.3/153.0 - 230.0)
An asterisk (*) indicates that the bolts are used for female threaded parts that are made of soft materials such as casting. Those shown in parentheses in the strength class indicate the classification by the old standard.
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