US Bolt Torque 

Recommended Torque (Ft-Lbs)

Size	Grade 5 Coarse	Grade 5 Fine	Grade 8 Coarse	Grade 8 Fine	18-8 SS Coarse	18-8 SS Fine	Bronze Coarse	Bronze Fine	Brass Coarse	Brass Fine
1/4	8	10	12	14	6.3	7.8	5.7	7.3	5.1	6.4
5/16	17	19	24	27	11	11.8	10.3	10.9	8.9	9.7
3/8	31	35	44	49	20	22	18	20	16	18
7/16	49	55	70	78	31	33	29	31	26	27
1/2	75	85	105	120	43	45	40	42	35	37
9/16	110	120	155	170	57	63	53	58	47	51
5/8	150	170	284	323	93	104	86	96	76	85
3/4	270	295	510	568	128	124	104	102	118	115
7/8	395	435	813	902	194	193	178	178	159	158
1	590	660	905	1030	287	289	265	240	235	212