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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

N*m

ft-lb

15-Apr-2008n:right'>N*m

ft-lb

N*m

N*m

ft-lb

N*m

ft-lb

N*m

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

N*m

ft-lb

N*m

ft-lb

Body Size

N*m

ft-lb

N*m

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,  Ron 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.
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