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6
Reference
6.1
Recommended Torques
6.1.1
Torque Specifications
The following tables provide the correct torque values for various bolts, cap screws, and hydraulic fittings.
• Tighten all bolts to the torque values specified in the charts (unless otherwise noted throughout this manual).
• Replace hardware with the same strength and grade of bolt.
• Use the 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.
SAE Bolt Torque 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 6.1 SAE Grade 5 Bolt and Grade 5 Free
Spinning Nut
Torque (N·m)
Torque (ft·lbf)
(*in·lbf)
Nominal
Size (A)
Min.
Max.
Min.
Max.
1/4-20
11.9
13.2
*106
*117
5/16-18
24.6
27.1
*218
*241
3/8-16
44
48
32
36
7/16-14
70
77
52
57
1/2-13
106
118
79
87
9/16-12
153
170
114
126
5/8-11
212
234
157
173
3/4-10
380
420
281
311
7/8-9
606
669
449
496
1-8
825
912
611
676
Figure 6.1: Bolt Grades
A - Nominal Size
B - SAE-8
C - SAE-5
D - SAE-2
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Revision A
Содержание A40-D
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