13
ASSEMBLY INSTRUCTIONS
TIGHTENING TORQUE OF BOLTS AND NUTS
If the torque levels are specified in the text, follow that specification.
American standard screws, bolts and nuts with UNC or
UNF threads
Metric cap screws
SAE grade No.
SAE GR.5
SAE GR.8
property class
8.8 Approx. SAE GR 5
1/4
(N m)
(kgf m)
(lbf ft)
11.7 to 15.8
1.19 to 1.61
8.6 to 11.6
16.3 to 19.8
1.66 to 2.02
12.0 to 14.6
M6
(N m)
(kgf m)
(lbf ft)
9.8 to 11.2
1.0 to 1.1
7.2 to 8.3
5/16
(N m)
(kgf m)
(lbf ft)
23.1 to 27.8
2.35 to 2.83
17.0 to 20.5
32.5 to 39.3
3.31 to 4.01
24.0 to 29.0
M8
(N m)
(kgf m)
(lbf ft)
23.6 to 27.4
2.4 to 2.8
17.4 to 20.2
3/8
(N m)
(kgf m)
(lbf ft)
47.5 to 57.0
4.84 to 5.81
35.0 to 42.0
61.0 to 73.2
6.22 to 7.46
45.0 to 54.0
M10
(N m)
(kgf m)
(lbf ft)
48.1 to 55.8
4.9 to 5.7
35.5 to 41.2
1/2
(N m)
(kgf m)
(lbf ft)
108.5 to 130.2
11.06 to 13.28
80.0 to 96.0
149.2 to 179.0
15.21 to 18.25
110.0 to 132.0
M12
(N m)
(kgf m)
(lbf ft)
77.5 to 90.1
7.9 to 9.2
57.2 to 66.5
9/16
(N m)
(kgf m)
(lbf ft)
149.2 to 179.0
15.21 to 18.25
110.0 to 132.0
217.0 to 260.4
22.13 to 26.55
160.0 to 192.0
M14
(N m)
(kgf m)
(lbf ft)
124 to 147
12.6 to 15.0
91.5 to 108.4
5/8
(N m)
(kgf m)
(lbf ft)
203.4 to 244.1
20.74 to 24.89
150.0 to 180.0
298.3 to 358.0
30.42 to 36.51
220.0 to 264.0
M16
(N m)
(kgf m)
(lbf ft)
197 to 225
20.0 to 23.0
145 to 166
M18
(N m)
(kgf m)
(lbf ft)
275 to 318
28.0 to 32.5
203 to 235
M20
(N m)
(kgf m)
(lbf ft)
368 to 431
37.6 to 44.0
272 to 318
