MAINTENANCE/SERVICE
Form # 169017
108
Issue – June 2008
7.4 RECOMMENDED
TORQUES
7.4.1 Bolts
The tables shown below give correct torque
values for various bolts and capscrews.
•
Tighten all bolts to the torques specified in chart
unless otherwise noted throughout this manual
•
Check tightness of bolts periodically, using bolt
torque chart as a guide.
•
Replace hardware with the same strength bolt.
•
Torque figures are valid for non-greased or non-
oiled threads and heads unless otherwise
specified. Do not grease or oil bolts or capscrews
unless specified in this manual. When using
locking elements, increase torque values by 5%.
7.4.1.1 SAE
Bolts
BOLT
DIA.
"A"
NC BOLT TORQUE*
SAE 5
SAE 8
lbf-ft N·m lbf-ft N·m
1/4" 9 12 11 15
5/16"
18 24 25 34
3/8" 32 43 41 56
7/16"
50 68 70 95
1/2" 75 102 105 142
9/16" 110 149 149 202
5/8" 150 203 200 271
3/4"
265 359 365 495
7/8" 420 569 600 813
1" 640 867 890 1205
* Torque categories for bolts and capscrews are
identified by their head markings.
7.4.1.2 Metric
Bolts
BOLT
DIA.
"A"
NC BOLT TORQUE*
8.8 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
M5 4 6 7 9
M6 7 10 11 15
M8 18 25 26 35
M10 37 50 52 70
M12 66 90 92 125
M14 103 140 148 200
M16 166 225 229 310
M20 321 435 450 610
M24 553 750 774 1050
M30 1103 1495 1550 2100
M36 1917 2600 2710 3675
* Torque categories for bolts and capscrews are
identified by their head markings.
SAE-5 SAE-8