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Revision A
Chapter 7:
Reference
7.1
Torque Specifications
The following tables provide correct torque values for various bolts, cap screws, and hydraulic fittings.
•
Tighten all bolts to torque values specified 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 finished 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).
7.1.1
Metric Bolt Specifications
Figure 7.1: Bolt Grades
Table 7.1 Metric Class 8.8 Bolts and Class 9 Free Spinning Nut
Nominal
Size (A)
Torque (Nm)
Torque (lbf·ft) (*lbf·in)
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
