Chapter 8: Reference; Torque Specifications; Metric Bolt Specifications - MacDon M1170 Operator's Manual

Chapter 8: Reference

8.1 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).

8.1.1 Metric Bolt Specifications

Table 8.1 Metric Class 8.8 Bolts and Class 9 Free Spinning Nut
Torque (Nm)
Nominal
Size (A)
Min.
3-0.5 1.4
3.5-0.6 2.2
4-0.7 3.3
5-0.8 6.7
6-1.0 11.4
8-1.25 28
55
10-1.5
12-1.75 95
14-2.0 152
16-2.0 236
20-2.5 460
24-3.0 796
214733
Torque (lbf·ft) (*lbf·in)
Max. Min.
1.6
*13
2.5
*20
3.7
*29
7.4
*59
12.6
*101
30 20
60 40
105 70
168 113
261 175
509 341
879 589
Max.
*14
*22
*32
*66
*112
23
45
78
Figure 8.1: Bolt Grades
124
193
377
651
417
A
Revision A