Demco AC20037 Bolt Torque for Standard bolts, Lb-ft N.m, Bolt Torque for Metric bolts, Class, 9.8

BOLT TORQUE

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. Replace 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 *

Torque Specifications		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 *

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 values

by 5%.

*GRADE or CLASS value for bolts and capscrews are identified by their head markings.

	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)

GRADE-2 GRADE-5 GRADE-8

CLASS 8.8 CLASS 9.8 CLASS 10.9

8.8 9.8 10.9

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