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Bolt Torque Specifications

Checking Bolt Torque

The tables shown give correct torque values 

for various bolts and capscrews. Tighten all 

bolts to the torque values specified in the 

table, unless indicated otherwise. Check 

tightness of bolts periodically. 

IMPORTANT! If replacing hardware, use 

fasteners of the same grade.

IMPORTANT! Torque figures indicated in 

the table are for non-greased or non-oiled 

threads. Do not grease or oil threads 

unless indicated otherwise. When using a 

thread locker, increase torque values by 

5%.

 Note:

Bolt grades are identified by their 

head markings.

Imperial Bolt Torque Specifications

Bolt 

Diameter

Torque Value

SAE Gr. 2

SAE Gr. 5

SAE Gr. 8

lbf•ft

N•m

lbf•ft

N•m

lbf•ft

N•m

1/4"

6

8

9

12

12

17

5/16"

10

13

19

25

27

36

3/8"

20

27

33

45

45

63

7/16"

30

41

53

72

75

100

1/2"

45

61

80

110

115

155

9/16"

60

95

115

155

165

220

5/8"

95

128

160

215

220

305

3/4"

165

225

290

390

400

540

7/8"

170

230

420

570

650

880

1"

225

345

630

850

970

1320

Metric Bolt Torque Specifications

Bolt 

Diameter

Torque Value

Gr. 8.8

Gr. 10.9

lbf•ft

N•m

lbf•ft

N•m

M3

0.4

0.5

1.3

1.8

M4

2.2

3

3.3

4.5

M6

7

10

11

15

M8

18

25

26

35

M10

37

50

52

70

M12

66

90

92

125

M16

166

225

229

310

M20

321

435

450

610

M30

1,103

1 495

1,550

2 100

M36

1,917

2 600

2,700

3 675

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