Bolt Torque Specifications

GRADE 2 - Low Strength (Common Hardware)

SIZE	LUBED (Oil/Anti-seize)	ZINC (Plated)	DRY (Plain/Uncoated)
1/4-20	4	6	5
5/16-18	8	13	11
3/8-16	15	23	19
7/16-14	24	37	31
1/2-13	37	57	47
9/16-12	53	82	68
5/8-11	73	112	93
3/4-10	125	200	165
7/8-9	129	322	267
1-8	188	483	400

GRADE 5 - Medium Strength (Standard Automotive)

SIZE	LUBED (Oil/Anti-seize)	ZINC (Plated)	DRY (Plain/Uncoated)
1/4-20	6.3	9	8
5/16-18	13	18	15
3/8-16	23	33	28
7/16-14	37	52	44
1/2-13	57	80	68
9/16-12	82	115	97
5/8-11	112	159	133
3/4-10	200	282	236
7/8-9	322	454	380
1-8	483	682	571

GRADE 8 - High Strength (Critical Fasteners)

SIZE	LUBED (Oil/Anti-seize)	ZINC (Plated)	DRY (Plain/Uncoated)
1/4-20	9	13	11
5/16-18	18	26	22
3/8-16	33	47	39
7/16-14	52	74	62
1/2-13	80	113	95
9/16-12	115	162	136
5/8-11	159	225	188
3/4-10	282	398	333
7/8-9	454	641	537
1-8	682	962	806

CRITICAL NOTES: • Always torque in a star/cross pattern, never in a circle | • Re-check torque after first heat cycle | • Use a calibrated torque wrench | • Lubed = oil or anti-seize applied to threads | • Over-torquing can strip threads or break bolts | • Under-torquing can cause loosening and failure

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