Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

PART 8: MAINTENANCE AND SERVICE
Standard Capscrew Torque Specifications
SAE Grade
Number
Capscrew
Body Size
(inchesthread)
5 8
Torque
Torque
Lb. ft. N.m. Lb. ft. N.m.
1/4-20 6-9 8-12 9-12 12-16
1/4-28 7 - 10 9.5 - 14 10 - 14 14 - 19
5/16-18 13 - 18 18 -24 18 - 25 24 -34
5/16-24 14 - 20 19 - 27 20 -28 27 - 38
3/8-16 22 - 32 30 - 43 31- 44 42 - 60
3/8-24 25 - 40 34 - 54 35 - 50 47 -68
7/16-14 35 - 50 47 - 68 50 - 71 68 - 96
7/16-20 39 - 56 53 - 76 56 - 80 76 - 108
1/2-13 54 - 77 73 - 104 76 - 109 103 - 149
1/2-20 58 - 77 79 - 118 86 -123 117 - 167
9/16-12 78 - 111 105 - 151 110 -158 149 - 214
9/16-18 87 - 124 118 - 168 123 -176 167 - 239
5/8-11 108 - 154 147 - 209 153 -218 208 - 296
SAE Grade
Number
Capscrew
Body Size
(inchesthread)
Standard Capscrew Torque Specifications
5 8
Torque
Torque
Lb. ft. N.m. Lb. ft. N.m.
5/8-18 122 - 174 166 - 236 173 -247 235 - 335
3/4-10 192 - 273 260 - 370 271 -386 367 - 523
3/4-16 214 - 305 290 - 414 303 - 431 411 - 583
7/8-9 309 - 441 419 - 598 437 - 624 593 - 846
7/8-14 341 - 486 462 - 659 482 - 589 654 - 799
1-8 464 - 662 629 - 898 656 - 935 889 - 1268
1-12 508- 724 698 - 982 718 - 1023 973 - 1386
The torque values in the previous tables are based on the
use of clean and dry threads.
Frame Fasteners
• Go around your vehicle as per "PART 8: MAINTE-
NANCE AND SERVICE" and tighten all frame fasteners
with a torque wrench.
• Always use the torque values listed in the frame fastener
table.
R(08/07) Y53-6015 – 179 –