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TORQUE DATA FOR STANDARD NUTS, BOLTS, AND CAP SCREWS.
Tighten all bolts to torques specified in chart unless otherwise noted. Check tightness of bolts
periodically, using bolt chart as guide. Replace hardware with same grade bolt.
NOTE: Unless otherwise specified, high-strength Grade 5 hex bolts are used throughout
assembly of equipment.
Torque Specifications
Torque figures indicated are valid for
non-greased or non-oiled threads and
heads unless otherwise specified.
Therefore, do not grease or oil bolts or
cap screws unless otherwise specified
in this manual. When using locking
elements, increase torque values
by 5%.
*
GRADE or CLASS value for bolts
and capscrews are identified by their
head markings.
BOLT TORQUE
Bolt Torque for Standard bolts *
GRADE 2
“A”
lb-ft
(N.m)
1/4”
6
(8)
5/16”
10
(13)
3/8”
20
(27)
7/16”
30
(40)
1/2”
45
(60)
9/16”
70
(95)
5/8”
95
(130)
3/4”
165
(225)
7/8”
170
(230)
1”
225
(300)
Bolt Torque for Metric bolts *
CLASS 8.8
“A”
lb-ft
(N.m)
6
9
(13)
7
15
(21)
8
23
(31)
10
45
(61)
12
78
(106)
14
125
(169)
16
194
(263)
18
268
(363)
20
378
(513)
22
516
(699)
24
654
(886)
GRADE-2 GRADE-5
CLASS 8.8 CLASS 9.8 CLASS 10.9
9.8
8.8
Page 4
GRADE 5
GRADE 8
lb-ft
(N.m)
lb-ft
9
(12)
12
18
(25)
25
30
(40)
45
50
(70)
80
75
(100)
115
115
(155)
165
150
(200)
225
290
(390)
400
420
(570)
650
630
(850)
970
CLASS 9.8
CLASS 10.9
lb-ft
(N.m)
lb-ft
10
(14)
13
18
(24)
21
25
(34)
31
50
(68)
61
88
(118)
106
140
(189)
170
216
(293)
263
--
--
364
--
--
515
--
--
702
--
--
890
GRADE-8
10.9
(N.m)
(16)
(35)
(60)
(110)
(155)
(220)
(300)
(540)
(880)
(1310)
(N.m)
(17)
(29)
(42)
(83)
(144)
(230)
(357)
(493)
(689)
(952)
(1206)
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