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US Bolt Head/Wrench Size Table

Metric
millimeters

US
(Nearest 32nd)

2

3/32

2.5

3/32

3

1/8

4

5/32

5

3/16

6

1/4

8

5/16

10

13/32

12

15/32

14

9/16

16

5/8

18

23/32

20

25/32

25

1

30

1-3/16

35

1-3/8

40

1-9/16

45

1-3/4

50

2

Metric
millimeters

US
(Nearest 32nd)

55

2-3/16

60

2-3/8

65

2-9/16

70

2-3/4

75

2-15/16

80

3-1/8

85

3-3/8

90

3-9/16

95

3-3/4

100

3-15/16

110

4-5/16

120

4-3/4

130

5-1/8

140

5-1/2

150

5-7/8

160

6-6/16

170

6-11/16

180

7-1/16

190

7-1/2

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