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Torque specifications for fasteners

A bolt of the same size, thread, and material in a given grade can generally be tightened to a given torque; for example, grade-5, 1/4-20 should be torqued no more than 7 ft-lb in cast iron or 6 ft-lb in aluminum. In grade 8, those numbers are 11 and 9. This should apply universally to all such bolts, with some exceptions, e.g. for different alloys.

This information is for the bolt shaft size, not the bolt head size. Bolt and fastened material alloys change these numbers.

These numbers are for reference only; compare them to the bolt maker's specifications for confirmation. We suggest using them as a guide when you cannot obtain the car manufacturer's or bolt maker's specifications.


Metric Class
4T
Dia Pitch
Standard
Hex-head Bolt

Flange-Headed Bolt
mm mm N•m Ft-lb N•m Ft-lb

6

1
55 kgf-cm 48 in-lb 60 kgf-cm 52 in-lb

8

1.25
130 kgf-cm 108 in-lb 145 kgf-cm
10

10

1.25

26

19

29

21

12

1.25

47

35

53

39

14

1.5

74

55

84

61

16

1.5

115

83
- -

Metric Class
5T
Dia Pitch
Standard
Hex-head Bolt

Flange-Headed Bolt
mm mm N•m Ft-lb N•m Ft-lb

6

1
65 kgf-cm 56 in-lb 75 kgf-cm 65 in-lb

8

1.25
160 kgf-cm
12
175 kgf-cm
13

10

1.25

32

24

36

26

12

1.25

59

43

65

48

14

1.5

91

67

100

76

16

1.5

140

101
- -

Metric Class
6T
Dia Pitch
Standard
Hex-head Bolt

Flange-Headed Bolt
mm mm N•m Ft-lb N•m Ft-lb

6

1
80 kgf-cm 69 in-lb 90 kgf-cm 78 in-lb

8

1.25

19

14

21

15

10

1.25

39

29

44

32

12

1.25

71

53

80

90

14

1.5

110

80

125

90

16

1.5

170

127
- -

Metric Class
7T
Dia Pitch
Standard
Hex-head Bolt

Flange-Headed Bolt
mm mm N•m Ft-lb N•m Ft-lb

6

1
110 kgf-cm 96 in-lb 120 kgf-cm 108 in-lb

8

1.25

25

19

28

21

10

1.25

52

38

58

43

12

1.25

95

70

105

76

14

1.5

145

108

165

123

16

1.5

230

166
- -

Metric Class
8T
Dia Pitch
Standard
Hex-head Bolt

Flange-Headed Bolt
mm mm N•m Ft-lb N•m Ft-lb

8

1.25

29

22

33

24

10

1.25

61

45

68

50

12

1.25

110

80

120

90

Metric Class
9T
Dia Pitch
Standard
Hex-head Bolt

Flange-Headed Bolt
mm mm N•m Ft-lb N•m Ft-lb

8

1.25

34

25

37

27

10

1.25

70

51

78

57

12

1.25

125

94

140

105

Metric Class
10T
Dia Pitch
Standard
Hex-head Bolt

Flange-Headed Bolt
mm mm N•m Ft-lb N•m Ft-lb

8

1.25

38

28

42

31

10

1.25

78

58

88

64

12

1.25

140

105

155

116

Metric Class
11T
Dia Pitch
Standard
Hex-head Bolt

Flange-Headed Bolt
mm mm N•m Ft-lb N•m Ft-lb

8

1.25

42

31

47

35

10

1.25

87

64

97

72

12

1.25

155

116

175

130


Metric Grade
9.8
Dia

Cast Iron

Aluminum
mmN•mFt-lbN•mFt-lb
69574
7149117
825181814
1040303025
1270555540
14115859065
16180130140100
18230170180135

Metric Grade
10.9
Dia

Cast Iron

Aluminum
mmN•mFt-lbN•mFt-lb
6149117
718141411
832232518
1060454535
12105758060
1416012012595
16240175190135
18320240250185

Metric Grade
12.9
Dia

Cast Iron

Aluminum
mmN•mFt-lbN•mFt-lb
6149117
725181814
836272521
1070505540
121259510075
14195145150110
16290210220165
18400290310230


SAE Grade 5

SAE Grade 8

Size

Cast Iron

Aluminum

Size

Cast Iron

Aluminum
Dia - tpi

N•m

Ft-lb

N•m

Ft-lb
Dia - tpi
N•m

Ft-lb

N•m

Ft-lb
1/4 -
20
9786
1/4 -
20
1511129
1/4 -
28
12997
1/4 -
28
18131410
5/16 - 1820151612
5/16 - 1830222418
5/16 - 2423171914
5/16 - 2433242519
3/8 - 1640302520
3/8 - 1655404030
3/8 - 2440303525
3/8 - 2460454535
7/16 - 1460454535
7/16 - 1490656550
7/16 - 2065505540
7/16 - 2095707555
1/2 -
13
95707555
1/2 -
13
1309510075
1/2 -
20
100758060
1/2 -
20
15011012090
9/16 - 1213510011080
9/16 - 12190140150110
9/16 - 1815011011585
9/16 - 18210155170125
5/8 - 11180135150110
5/8 - 11255190205150
5/8 - 18210155160120
5/8 - 18290215230170
3/4 -
10
325240255190
3/4 -
10
460340365270
3/4 -
16
365270285210
3/4 -
16
515380410300
7/8 - 9480360380280
7/8 - 9745550600440
7/8 - 14530390420310
7/8 - 14825610660490
1 - 8720530570420
1 - 81100820890660
1 - 14800590650480
1 - 141200890960710


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