MacDon DWA, Operation And Parts Manual

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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.
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 (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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