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8 Reference
8.1 Torque Speci
fi
cations
The following tables provide correct torque values for various bolts, cap screws, and hydraulic
fi
ttings.
• Tighten all bolts to torque values speci
fi
ed in charts (unless otherwise noted throughout this manual).
• Replace hardware with same strength and grade of bolt.
• Use torque value tables as a guide and periodically check tightness of bolts.
• Understand torque categories for bolts and cap screws by using their identifying head markings.
Jam Nuts
When applying torque to
fi
nished jam nuts, multiply the torque applied to regular nuts by f=0.65.
Self-Tapping Screws
Standard torque is to be used (not to be used on critical or structurally important joints).
8.1.1 Metric Bolt Speci
fi
cations
Table 8.1 Metric Class 8.8 Bolts and Class 9 Free
Spinning Nut
Torque (N·m)
Torque (ft·lbf)
(*in·lbf)
Nominal
Size (A)
Min.
Max.
Min.
Max.
3-0.5
1.4
1.6
*13
*14
3.5-0.6
2.2
2.5
*20
*22
4-0.7
3.3
3.7
*29
*32
5-0.8
6.7
7.4
*59
*66
6-1.0
11.4
12.6
*101
*112
8-1.25
28
30
20
23
10-1.5
55
60
40
45
12-1.75
95
105
70
78
14-2.0
152
168
113
124
16-2.0
236
261
175
193
20-2.5
460
509
341
377
24-3.0
796
879
589
651
Figure 8.1: Bolt Grades
214053
377
Revision A
Содержание M1240
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