Chapter 7: Reference; Torque Specifications; Metric Bolt Specifications - MacDon R113 Operator's Manual

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

Table 7.1 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
10-1.5 55
12-1.75 95
14-2.0 152
16-2.0 236
20-2.5 460
24-3.0 796
214077
Torque (lbf·ft)
(*lbf·in)
Max. Min. Max.
1.6
*13 *14
2.5 *20 *22
3.7
*29 *32
7.4 *59 *66
12.6
*101 *112
30 20 23
60 40 45
105 70 78
168 113 124
261 175 193
509 341 377
879 589 651
Figure 7.1: Bolt Grades
191
A
Revision A