Standard bolt tightening torque

Part number Length of bolt: 20 mm Basic major diameter of thread: 6 mm

* Explanation of bolt head marks are as indicated in the following table.

SPECIFIED TORQUE FOR STANDARD BOLTS

Class

Basic diameter mm

Pitch mm

Torque limit

kg-m (ft-lb)

4T

6

1

0.4 -

0.7

( 3 - 5)

8

1.25

1.0 -

1.6

( 8- 11)

10

1.25

1.9 -

3.1

( 14 - 22)

10

1.5

1.8 -

3.0

( 14 - 21)

12

1.25 (ISO)

3.5 -

5.5

( 26 - 39)

12

1.5

3.5 -

5.5

( 26 - 39)

12

1.75

3.0 -

5.0

( 22 - 36)

13

1.5

4.5 -

7.0

( 33 - 50)

14

1.5

5.0 -

8.0

( 37 - 57)

14

2

4.7 -

7.7

( 34 - 55)

16

1.5

7.5 -

11.0

( 55 - 79)

-

16

2

7.1 -

10.6

( 52 - 76)

5T

6

1

0.6 -

0.9

( 5 - 6)

8

1.25

1.5 -

2.2

( 11 - 15)

10

1.25

3.0 -

4.5

( 22 - 32)

10

1.5

2.7 -

4.2

( 20 - 30)

12

1.25 (ISO)

5.0 -

8.0

( 37 - 57)

12

1.5

5.0 -

7.0

( 37 - 50)

12

1.75

4.8 -

6.8

( 35 - 49)

13

1.5

6.5 -

9.0

( 48 - 65)

14

1.5

7.5 -

11.0

( 55 - 79)

14

2

7.0 -

10.5

( 51 - 75)

16

1.5

12.0 -

17.0

( 87 - 122)

16

2

11.5 -

16.5

( 84 - 119)

6T

6

1

0.6 -

0.9

( 5 - 6)

8

1.25

1.5 -

2.2

( 11 - 15)

10

1.25

3.0 -

4.5

( 22 - 32)

10

1.5

2.7 -

4.2

( 20 - 30)

12

1.25 (ISO)

5.0 -

8.0

( 37 - 57)

12

1.5

5.0 -

7.0

( 37 - 50)

12

1.75

4.8 -

6.8

( 35 - 49)

SPECIFIED TORQUE FOR STANDARD BOLTS (Cont'd)

Class

Basic diameter mm

Pitch mm

Torque

limit

kg-m (ft-lb)

7T

6

1

0.8 -

1.2

( 6 -

8)

8

1.25

2.0 -

3.0

( 15 -

21)

10

1.25

4.0 -

5.5

( 29 -

39)

10

1.5

3.7 -

5.2

( 27 -

37)

12

1.25 (ISO)

7.5 -

10.5

( 55 -

75)

12

1.5

7.0 -

9.0

( 51 -

65)

12

1.75

6.0 -

8.5

( 44 -

61)

13

1.5

8.0 -

12.0

( 58 -

86)

14

1.5

10.0 -

15.0

( 73 -

108)

14

2

9.5 -

14.0

( 69 -

101)

16

1.5

15.0 -

23.0

(109 -

166)

16

I

14.0 -

22.0

(102 -

These torque specifications are applicable only for steel (female) threads.

They do not apply to other types of material or if the tightening surface is subjected to heat or vibration.

These torque specifications are applicable only for steel (female) threads.

They do not apply to other types of material or if the tightening surface is subjected to heat or vibration.

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