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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
capscrews unless otherwise specified in this manual.
When using locking elements, increase torque val-
ues by 5%.
* GRADE or CLASS value for bolts and capscrews
are identified by their head markings.
Torque Specifications
BOLT TORQUE DATA FOR STANDARD NUTS, BOLTS, AND
CAPSCREWS.
Tighten all bolts to torques specified in chart unless otherwise noted.
Check tightness of bolts periodically, using bolt chart as guide. Re-
place hardware with same grade bolt.
NOTE: Unless otherwise specified, high-strength Grade 5 hex bolts
are used throughout assembly of equipment.
Bolt Torque for Standard bolts
*
GRADE 2 GRADE 5 GRADE 8
“
A
”
lb-ft (N.m) lb-ft (N.m) lb-ft (N.m)
1/4
”
6
(8) 9
(12) 12 (16)
5/16
”
10 (13) 18
(25) 25 (35)
3/8
”
20 (27) 30
(40) 45 (60)
7/16
”
30 (40) 50
(70) 80 (110)
1/2
”
45 (60) 75
(100) 115 (155)
9/16
”
70 (95) 115
(155) 165 (220)
5/8
”
95 (130) 150
(200) 225 (300)
3/4
”
165 (225) 290
(390) 400 (540)
7/8
”
170 (230) 420
(570) 650 (880)
1
”
225 (300) 630
(850) 970 (1310)
Bolt Torque for Metric bolts *
CLASS 8.8 CLASS 9.8 CLASS 10.9
“A” lb-ft (N.m) lb-ft (N.m) lb-ft (N.m)
6
9
(13)
10
(14)
13 (17)
7
15
(21)
18
(24)
21
(29)
8
23
(31)
25
(34)
31
(42)
10
45
(61)
50
(68)
61
(83)
12
78 (106)
88
(118)
106 (144)
14
125 (169)
140
(189)
170 (230)
16
194 (263)
216
(293)
263 (357)
18
268 (363)
--
--
364 (493)
20
378 (513)
--
--
515 (689)
22
516 (699)
--
--
702 (952)
24
654 (886)
--
--
890 (1206)
WARRANTY POLICY, OPERATOR MANUALS & REGISTRATION
Go online to www.demco-products.com to review Demco warranty policies, operator manuals and register your Demco product.
