11.2 Common Bolt Torque
Checking Bolt Torque
The tables shown give correct torque values for various
bolts and capscrews. Tighten all bolts to the torque
values specified in the table, unless indicated otherwise.
Check tightness of bolts periodically.
IMPORTANT! If replacing hardware, use fasteners of
the same grade.
IMPORTANT! Torque figures indicated in the table are
for non-greased or non-oiled threads. Do not grease or
oil threads unless indicated otherwise. When using a
thread locker, increase torque values by 5%.
Bolt grades are identified by their head
markings.
Imperial Bolt Torque Speci cations
Bolt
Diameter
Torque Value
SAE Gr. 2 SAE Gr. 5 SAE Gr. 8
lbf•ft N•m lbf•ft N•m lbf•ft N•m
1/4" 6 8 9 12 12 17
5/16" 10 13 19 25 27 36
3/8" 20 27 33 45 45 63
7/16" 30 41 53 72 75 100
1/2" 45 61 80 110 115 155
9/16" 60 95 115 155 165 220
5/8" 95 128 160 215 220 305
3/4" 165 225 290 390 400 540
7/8" 170 230 420 570 650 880
1" 225 345 630 850 970 1320
Metric Bolt Torque Speci cations
Bolt
Diameter
Torque Value
Gr. 8.8 Gr. 10.9
lbf•ft N•m lbf•ft N•m
M3 0.4 0.5 1.3 1.8
M4 2.2 3 3.3 4.5
M6 7 10 11 15
M8 18 25 26 35
M10 37 50 52 70
M12 66 90 92 125
M14 83 112 116 158
M16 166 225 229 310
M20 321 435 450 610
M30 1,103 1 495 1,550 2 100
WP845 / WP875
Trailer Firewood Processor
Specifications
65
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