design - Land Rover section

 

Torque Table

 

This is a table of average torque values for different grades of bolts.  Please note that differences between manufacturer's can result in actual proper torque value for a certain bolt size to vary as much as 30% from the table value.  So consider this to be a generic guideline.  If you know the manufacturer of a bolt check their web site for their recommended value.

Bolt Assembly Torque (ft-lb)      
The torque values in the table are based on the use of lubricated threads.
Coarse Thread
Size Grade 2 Iron Grade 5 Iron Grade 8 Iron Aluminium

1/4-20 (NC)

7

11

5/16-18 (NC)

18 

15

22

12

3/8-16 (NC)

 

30

40

20

7/16-14 (NC)

32

45

65

35

1/2-13 (NC)

50

70

95

55

9/16-12 (NC)

70

100

140

80

5/8-11 (NC)

100

135

190

110

3/4-10 (NC)

175

240

340

190

7/8-9 (NC)

 

360

550

280

1-8 (NC)

 

530

820

420

Fine Thread
Size Grade 2 Iron Grade 5 Iron Grade 8 Iron Aluminium

1/4-28 (NF)

9

13

7

5/16-24 (NF)

12 

17

24

14

3/8-24 (NF)

 

30

45

25

7/16-20 (NF)

36

50

70

40

1/2-20 (NF)

55

75

110

60

9/16-18 (NF)

80

110

155

85

5/8-18 (NF)

110

155

215

120

3/4-16 (NF)

200

270

380

210

7/8-14 (NF)

 

390

610

310

1-14 (NF)

 

590

890

480

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