8
Reference
8.1
Torque Specifications
The following tables provide the correct torque values for various bolts, cap screws, and hydraulic fittings.
• Tighten all bolts to the torque values specified in the charts (unless otherwise noted throughout this manual).
• Replace hardware with the same strength and grade of bolt.
• Use the 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.
8.1.1
Metric Bolt Specifications
Table 8.1 Metric Class 8.8 Bolts and Class 9 Free
Spinning Nut
Torque (ft·lbf)
(*in·lbf)
Torque (N·m)
Nominal
Size (A)
Min.
Max.
Min.
Max.
3-0.5
*13
*14
1.4
1.6
3.5-0.6
*20
*22
2.2
2.5
4-0.7
*29
*32
3.3
3.7
5-0.8
*59
*66
6.7
7.4
6-1.0
*101
*112
11.4
12.6
8-1.25
20
23
28
30
10-1.5
40
45
55
60
12-1.75
70
78
95
105
14-2.0
113
124
152
168
16-2.0
175
193
236
261
20-2.5
341
377
460
509
24-3.0
589
651
796
879
Figure 8.1: Bolt Grades
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Revision A