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Drill Sizes - Numbered

Drill bits are available in hundreds of sizes, and the size designations include letters, numbers, decimals, and fractions. Decimal drill sizes further include both SAE units and metric units. This particular page presents the numbered drill size series. RF Cafe also has drill size tables for lettered drill size varieties.

These drill bits are almost always of the twist type that advance through the material being bored by turning in a clockwise direction as viewed from the top. They are said to be right-hand drill bits.

#	Diameter (in)		#	Diameter (in)		#	Diameter (in)		#	Diameter (in)		#	Diameter (in)
1	0.2280		21	0.1590		41	0.0960		61	0.0390		81	.0130
2	0.2210		22	0.1570		42	0.0935		62	0.0380		82	.0125
3	0.2130		23	0.1540		43	0.0890		63	0.0370		83	.0120
4	0.2090		24	0.1520		44	0.0860		64	0.0360		84	.0115
5	0.2055		25	0.1495		45	0.0820		65	0.0350		85	.0110
6	0.2040		26	0.1470		46	0.0810		66	0.0330		86	.0105
7	0.2010		27	0.1440		47	0.0785		67	0.0320		87	.0100
8	0.1990		28	0.1405		48	0.0760		68	0.0310		88	.0095
9	0.1960		29	0.1360		49	0.0730		69	0.0292		89	.0091
10	0.1935		30	0.1285		50	0.0700		70	0.0280		90	.0087
11	0.1910		31	0.1200		51	0.0670		71	0.0260		91	.0083
12	0.1890		32	0.1160		52	0.0635		72	0.0250		92	.0079
13	0.1850		33	0.1130		53	0.0595		73	0.0240		93	.0075
14	0.1820		34	0.1110		54	0.0550		74	0.0225		94	.0071
15	0.1800		35	0.1100		55	0.0520		75	0.0210		95	.0067
16	0.1770		36	0.1065		56	0.0465		76	0.0200		96	.0063
17	0.1730		37	0.1040		57	0.0430		77	0.0180		97	.0059
18	0.1695		38	0.1015		58	0.0420		78	0.0160
19	0.1660		39	0.0995		59	0.0410		79	0.0145
20	0.1610		40	0.0980		60	0.0400		80	0.0135

Thanks to Jeff M. for pointing out the previous error in the #61 - #80 values (they were shifted by one row).

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