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Machine Screw Size Chart and Conversion Tables

A #8 screw size is .164 fraction of an inch. The diameters listed in the chart below are in fractions of an inch, so the #12 is just shy of 1/4 inch.

A more detailed table with thread count can be found below, along with tap drill sizes.
Detailed screw sizes charts.
Screw and Tap Drill sizes

Machine Screw Sizes


Size Number

000 00 0 1 2 3 4 5 6 8 10 12

Diameter

.034 .047 .060 .073 .086 .099 .112 .125 .138 .164 .190 .216

Hole Diameter

.040 .053 .066 .080 .094 .107 .120 .133 .146 .173 .198 .224


Decimal and Millimeter Equivalents of Fractional Parts of an Inch

Fraction Decimal Millimeter Fraction Decimal Millimeter Fraction Decimal Millimeter
1 1.0000 25.4000 21/32 0.6562 16.6687 5/16 0.3125 7.9375
63/64 0.984 25.0031 41/64 0.6406 16.2719 19/64 0.2969 7.5406
31/32 0.9688 24.6062 5/8 0.6250 15.8750 9/32 0.2812 7.1437
61/64 0.9531 24.2094 39/64 0.6094 15.4781 17/64 0.2656 6.7469
15/16 0.9375 23.8125 19/32 0.5938 15.0813 1/4 0.2500 6.3500
59/64 0.9219 23.4156 37/64 0.5781 14.6844 15/64 0.2344 5.9531
29/32 0.9062 23.0187 9/16 0.5625 14.2875 7/32 0.2188 5.5563
57/64 0.8906 22.6219 35/64 0.5469 13.8906 13/64 0.2031 5.1594
7/8 0.8750 22.2250 17/32 0.5312 13.4937 3/16 0.1875 4.7625
55/64 0.8594 21.8281 33/64 0.5156 13.0969 11/64 0.1719 4.3656
27/32 0.8438 21.4312 1/2 0.5000 12.7000 5/32 0.1562 3.9688
53/64 0.8281 21.0344 31/64 0.4844 12.3031 9/64 0.1406 3.5719
13/16 0.8125 20.6375 15/32 0.4688 11.9062 1/8 0.1250 3.1750
51/64 0.7969 20.2406 29/64 0.4531 11.5094 7/64 0.1094 2.7781
25/32 0.7812 19.8438 7/16 0.4375 11.1125 3/32 0.0938 2.3812
49/64 0.7656 19.4469 27/64 0.4220 10.7188 5/64 0.0781 1.9844
3/4 0.7500 19.0500 13/32 0.4062 10.3187 1/16 0.0625 1.5875
47/64 0.7344 18.6531 25/64 0.3906 9.9219 3/64 0.0469 1.1906
23/32 0.7188 18.2563 3/8 0.3750 9.5250 1/32 0.0312 0.7937
45/64 0.7031 17.8594 23/64 0.3594 9.1281 1/64 0.0156 0.3969
11/16 0.6875 17.4625 11/32 0.3438 8.7312 -- -- --
43/64 0.6719 17.0656 21/64 0.3281 8.3344 -- -- --
Version 3.7.8


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