Chapter 6: Reference; Torque Specifications; Sae Bolt Torque Specifications - MacDon M155 Unloading And Assembly Instructions

6 Reference

6.1 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).

6.1.1 SAE Bolt Torque Specifications

Torque values shown in following tables are valid for non-greased, or non-oiled threads and heads; therefore,
do NOT grease or oil bolts or cap screws unless otherwise specified in this manual.
Table 6.1 SAE Grade 5 Bolt and Grade 5 Free
Spinning Nut
Torque (Nm)
Nominal
Size (A)
Min.
1/4-20 11.9
5/16-18 24.6
3/8-16 44
7/16-14 70
106
1/2-13
9/16-12 153
212
5/8-11
3/4-10 380
606
7/8-9
1-8 825
214298
Torque (lbf·ft)
(*lbf·in)
Max. Min.
13.2 *106
27.1 *218
48 32
77 52
118 79
170 114
234 157
420 281
669 449
912 611
Max.
*117
*241
36
57
87
126
Figure 6.1: Bolt Grades
173
A - Nominal Size
C - SAE-5
311
496
676
241
B - SAE-8
D - SAE-2
Revision A