MacDon R85 - Chapter 8: Reference; 8.1 Torque Specifications

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8 Reference
8.1 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).
8.1.1 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.
A
1004958
B
C
D
Figure 8.1: Bolt Grades
A - Nominal Size B - SAE-8
C - SAE-5 D - SAE-2
Table 8.1 SAE Grade 5 Bolt and Grade 5 Free
Spinning Nut
Nominal
Size (A)
Torque (Nm)
Torque (lbf·ft)
(*lbf·in)
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