Bolts and Screws: Conversion from Fractions of an Inch to Millimeters

Updated June 26, 2019 | Infoplease Staff
Inch mm
1/64 0.40
1/32 0.79
3/64 1.19
1/16 1.59
5/64 1.98
3/32 2.38
7/64 2.78
1/8 3.18
9/64 3.57
5/32 3.97
11/64 4.37
3/16 4.76
13/64 5.16
7/32 5.56
15/64 5.95
1/4 6.35
17/64 6.75
9/32 7.14
19/64 7.54
5/16 7.94
21/64 8.33
11/32 8.73
23/64 9.13
3/8 9.53
25/64 9.92
13/32 10.32
27/64 10.72
7/16 11.11
29/64 11.51
15/32 11.91
31/64 12.30
1/2 12.70
33/64 13.10
17/3213.50
35/64 13.90
9/16 14.29
37/64 14.69
19/32 15.08
39/64 15.48
5/8 15.88
41/64 16.27
21/32 16.67
43/64 17.06
11/16 17.46
45/64 17.86
23/32 18.26
47/64 18.65
3/4 19.05
49/64 19.45
25/32 19.84
51/64 20.24
13/16 20.64
53/64 21.03
27/32 21.43
55/64 21.83
7/8 22.23
57/64 22.62
29/32 23.02
59/64 23.42
15/16 23.81
61/64 24.21
31/32 24.61
63/64 25.00
1 25.40

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