MacDon M155 - Reference; Recommended Torques; Torque Specifications; SAE Bolt Torque Specifications

8 Reference
8.1 Recommended Torques
8.1.1 Torque Specifications
The followin
g tables provide the correct torque values for various bolts, cap screws, and hydraulic fi ttings.
• Tighten all
bolts to the torque values specified in the charts (unless otherwise noted throughout this manual).
• Replace har
dware with the same strength and grade of bolt.
•Usethetorq
ue value tables as a guide and periodically check tightness of bolts.
• Understan
d torque categories for bolts and cap screws by using their identifying head markings.
SAE Bolt To
rque Specifications
Torque values shown in the 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 8.1 SAE Grade 5 Bolt and Grade 5 Free
Spinning Nut
Torque (
ft·lbf)
(*in·lb
f)
Torque (
N·m)
Nominal
Size (A)
Min. Max. Min. Max.
1/4-20 *106 *117
11.9 13.2
5/16-18 *218 *241
24.6 27.1
3/8-16
32 36 44 48
7/16
-14
52
57
70
77
1/2-13
79 87 106 118
9/16-12
114 126 153 170
5/
8-11
157 173 212 234
3/4-10
281 311 380 420
7/8-9
44
9
49
6
60
6
66
9
1-8 611 676 825 912
Figure 8.1: Bolt Grades
A-NominalSize B-SAE-8
C-SAE
-5
D-SAE
-2
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