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5
FRAME MODIFICATIONS
Peterbilt Motors Company 5-3
TORQUE REQUIREMENTS
Torque values apply to fasteners with clean threads, lightly lubricated, with hardened steel washers, and nylon-insert nuts.
TABLE 5-1. Customary Grade 8 UNF or UNC.
Fastener
Torque
Size
Nm
Lb.-Ft
5/16
22–30
16–22
3/8
41–54
30–40
7/16
75–88
55–65
1/2
109–122
80–90
9/16
156–190
115-140
5/8
224–265
165–195
3/4
394–462
290–340
7/8
517–626
380–460
1
952–1129
800–830
1-1/8
1346–1591
990–1170
1-1/4
1877–2217
1380–1630
TABLE 5-2. U.S. Customary - Grade 8 Metric Class 10.9
Fastener
Torque
Size
Nm
Lb-Ft
M6
9–15
7–11
M8
23–31
17–23
M10
33–43
24–32
M12
75–101
55–75
M14
134–164
99–121
M16
163–217
120–160
M20
352–460
260–340
WELDING
The frame rails are heat treated; therefore, they are not weldable.