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Torque Specification Chart

FOR STANDARD MACHINE HARDWARE (Tolerance  ± 20%)

Hardware
Grade

SAE Grade 2

SAE Grade 5

SAE Grade 8

Size Of

in/lbs

in/lbs

in/lbs

Hardware

ft/lbs

Nm.

ft/lbs

Nm.

ft/lbs

Nm.

8-32

19

2.1

30

3.4

41

4.6

8-36

20

2.3

31

3.5

43

4.9

10-24

27

3.1

43

4.9

60

6.8

10-32

31

3.5

49

5.5

68

7.7

1/4-20

66

7.6

8

10.9

12

16.3

1/4-28

76

8.6

10

13.6

14

19.0

5/16-18

11

15.0

17

23.1

25

34.0

5/16-24

12

16.3

19

25.8

27

34.0

3/8-16

20

27.2

30

40.8

45

61.2

3/8-24

23

31.3

35

47.6

50

68.0

7/16-14

30

40.8

50

68.0

70

95.2

7/16-20

35

47.6

55

74.8

80

108.8

1/2-13

50

68.0

75

102.0

110

149.6

1/2-20

55

74.8

90

122.4

120

163.2

9/16-12

65

88.4

110

149.6

150

204.0

9/16-18

75

102.0

120

163.2

170

231.2

5/8-11

90

122.4

150

204.0

220

299.2

5/8-18

100

136

180

244.8

240

326.4

3/4-10

160

217.6

260

353.6

386

525.0

3/4-16

180

244.8

300

408.0

420

571.2

7/8-9

140

190.4

400

544.0

600

816.0

7/8-14

155

210.8

440

598.4

660

897.6

1-8

220

299.2

580

788.8

900

1,244.0

1-12

240

326.4

640

870.4

1,000

1,360.0

Hex Head Capscrew

Hex Nut

Lockwasher

Washer

Carriage Bolt

NOTES

1. These torque values are to be used for all hardware

excluding: locknuts, self-tapping screws, thread forming
screws, sheet metal screws and socket head setscrews.

2. Recommended seating torque values for locknuts:

a. for prevailing torque locknuts - use 65% of grade 5

torques.

b. for flange whizlock nuts and screws - use 135% of

grade 5 torques.

3. Unless otherwise noted on assembly drawings, all torque

values must meet this specification.

Hardware Identification  &  Torque Specifications

Common Hardware Types

Screw, 1/2 x 2

Body

Diameter

Body

Length

Inside
Diameter

Nut, 1/2”

No

Marks

3/8” Bolt or Nut

Wrench—9/16”

3/8

5/16” Bolt or Nut

Wrench—1/2”

5/16

1/4” Bolt or Nut

Wrench—7/16”

1/4

1/2” Bolt or Nut

Wrench—3/4”

1/2

DIA.

7/16
DIA.

7/16” Bolt or Nut

Wrench (Bolt)—5/8”

Wrench (Nut)—11/16”

Wrench & Fastener Size Guide

Standard Hardware Sizing

When a washer or nut is identified as 

1/2”

, this is the

Nominal size

, meaning the 

inside diameter

is 1/2 inch; if a

second number is present it represent the 

threads per inch

When bolt or capscrew is identified as 

1/2 - 16 x 2”

, this

means the 

Nominal size

, or 

body diameter

is 1/2 inch; the

second number represents the 

threads per inch

(16 in this

example, and the final number is the 

body length 

of the

bolt or screw (in this example 2 inches long).

The guides and ruler furnished below are designed to
help you select the appropriate hardware and tools.

0

1/4

3/4

1/2

1

1/4

3/4

1/2

2

1/4

3/4

1/2

3

1/4

3/4

1/2

4

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