Bolt Torque by Grade and size

Max Torque (ft-lbs) clean dry threads

Good for race cars, hot rods, roadsters, Ford Mustang, Camaro, Corvette and performance engine parts.

More tech info
Bolt size - Thread pitch	Grade 2	Grade5	Grade 8	Special Alloy
1/4-20	6	10	12	14
1/4-28	7	12	15	17
5/16-18	13	20	24	29
5/16-24	14	22	27	35
3/8-16	23	36	44	58
3/8-24	26	40	48	69
7/16-14	37	52	63	98
7/16-20	41	57	70	110
1/2-13	57	80	98	145
1/2-20	64	90	110	160
9/16-12	82	120	145	200
9/16-18	91	135	165	220
5/8-11	111	165	210	280
5/8-18	128	200	245	310
3/4-10	200	285	335	490
3/4-16	223	315	370	530
7/8-9	315	430	500	760
7/8-14	340	470	550	800
1-8	400	650	760	1130
1-14	460	710	835	1210