Drill Bit Size Chart | Fractional, Number, Letter & Metric Conversion

Workshop Standard
Drill Bit & Tap Size Reference

Drill Size	Decimal (In)	Metric (mm)	Tap Size (SAE/Metric)
#80	.0135	0.3429	-
#56	.0465	1.1811	0-80 UNC
3/64	.0469	1.1906	-
#53	.0595	1.5113	1-72 UNF / M1.6
#50	.0700	1.7780	2-56 UNC
#47	.0785	1.9939	3-48 UNC / M2.5
#43	.0890	2.2606	4-40 UNC
#36	.1065	2.7051	6-32 UNC / M3.5
#33	.1130	2.8702	6-40 UNF
#29	.1360	3.4544	8-32 UNC / M4
#25	.1495	3.7973	10-24 UNC
#21	.1590	4.0386	10-32 UNF / M5
#7	.2010	5.1054	1/4-20 UNC / M6
#3	.2130	5.4102	1/4-28 UNF
Letter A	.2340	5.9436	-
Letter F	.2570	6.5278	5/16-18 UNC / M8
Letter I	.2720	6.9088	5/16-24 UNF
Letter O	.3160	8.0264	M10 x 1.5
Letter Q	.3320	8.4328	3/8-16 UNC
Letter U	.3680	9.3472	7/16-14 UNC / M11
27/64	.4219	10.7156	1/2-13 UNC / M12
29/64	.4531	11.5094	1/2-20 UNF
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