Bolt Markings and Torques

Bolt Marking and Torque Standards

Bolt Markings and Torque - Metric
Commercial Steel Class	9.8				10.9				12.9
Bolt Head Marking
Body Size	Torque				16-Apr-2008e='text-align:center'>Torque	Torque
Diam.	Cast Iron		Aluminum		Cast Iron		Aluminum		Cast Iron		Aluminum
mm	*Nm**	ft-lb	15-Apr-2008n:right'>*Nm**	ft-lb	*Nm**	*Nm**	ft-lb	*Nm**	ft-lb	*Nm**	ft-lb
6	9	5	7	4	14	9	11	7	14	9	11	7
7	14	9	11	7	18	14	14	11	23	18	18	14
8	25	18	18	14	32	23	25	18	36	27	28	21
10	40	30	30	25	60	45	45	35	70	50	55	40
12	70	55	55	40	105	75	75	60	125	95	100	75
14	115	85	90	65	160	120	120	95	195	145	150	110
16	180	130	140	100	240	175	175	135	290	210	220	165
18	230	170	180	135	320	240	240	185	400	290	310	230

Bolt Markings and Torque Values - U.S. Customary
SAE Grade Number	5				8
Bolt Head Markings These are all SAE Grade 5 (3) line
	Bolt Torque - Grade 5 Bolt					Bolt Torque - Grade 8 Bolt
	Cast Iron		Aluminum			Cast Iron		Aluminum
Body Size	*Nm**	ft-lb	*Nm**	ft-lb	Body Size	*Nm**	ft-lb	*Nm**	ft-lb
1/4 - 20	9	7	8	6	1/4 - 20	15	11	12	9
- 28	12	9	9	7	- 28	18	13	14	10
5/16 - 18	20	15	16	12	5/16 - 18	30	22	24	18
- 24	23	17	19	14	- 24	33	24	25	19
3/8 - 16	40	30	25	20	3/8 - 16	55	40	40	30
- 24	40	30	35	25	- 24	60	45	45	35
7/16 - 14	60	45	45	35	7/16 - 14	90	65	65	50
- 20	65	50	55	40	- 20	95	70	75	55
1/2 - 13	95	70	75	55	1/2 - 13	130	95	100	75
- 20	100	75	80	60	- 20	150	110	120	90
9/16 - 12	135	100	110	80	9/16 - 12	190	140	150	110
- 18	150	110	115	85	- 18	210	155	170	125
5/8 - 11	180	135	150	110	5/8 - 11	255	190	205	150
- 18	210	155	160	120	- 18	290	215	230	170
3/4 - 10	325	240	255	190	3/4 - 10	460	340	365	270
- 16	365	270	285	210	- 16	515	380	410	300
7/8 - 9	490	360	380	280	7/8 - 9	745	550	600	440
- 14	530	390	420	310	- 14	825	610	660	490
1 - 8	720	530	570	420	1 - 8	1100	820	890	660
- 14	800	590	650	480	- 14	1200	890	960	710

This page last updated: 06-Dec-2007

Content and Design © 2002-present WanderingTrail, Ronald Seegert
Common Sense and Safety should always be observed when working on your vehicle or doing modifications. Jackstands, wheel blocks, disconnecting the battery are a few of the basic safety precautions that should be used and may not be mentioned in the write ups on this site. You are responsible for your own installation, these write ups are a helpful guideline and should not be taken as an official installation instruction. My write up may be different from the kits currently out there, so alwasy double check the manufacturers installation instructions when installing anything. I try to keep the site up to date with changes that have occured as I discover them, but may not have the latest unless someone lets me know. If you feel that an install is above your capabilities after reading my write ups, I recommend getting together with a club and getting some help. Only a few times have I needed to employe some actual help from a shop to get something done. Usually welding or A/C work. While I have spent many years working on mechanical systems, I am not an expert, nor do I pretend to be one. I hope these write ups have been useful to you.
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