US Bolts - Tightening Torques

The tightening torques below are for imperial US bolts with tension approximately 70% of yield strength.

Size (in)	Torque (lbf ft)
	SAE Grade 2		SAE Grade 5		SAE Grade 8		18-8 S/S
	Coarse	Fine	Coarse	Fine	Coarse	Fine	Coarse	Fine
1/4	4	4.7	6.3	7.3	9	10	6.3	7.8
5/16	8	9	13	14	18	20	11	11.8
3/8	15	17	23	26	33	37	20	22
7/16	24	27	37	41	52	58	31	33
1/2	37	41	57	64	80	90	43	45
9/16	53	59	82	91	115	129	57	63
5/8	73	83	112	128	159	180	93	104
3/4	115	138	200	223	282	315	128	124
7/8	129	144	322	355	454	501	194	193
1	188	210	483	541	682	764	287	289

• 1 inch = 25.4 mm

The values are for slightly lubricated bolts. For dry bolts increase the torques with approximately 30%.

• Bolt Torque Calculator
• Metric Bolts - Tightening Torques

• Reduced Torque with Lubricated Bolts

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