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Drill Bit Diameter Conversion Chart

PreciseBits offers bits in the following diameter sizes

Drill Number	Fractional Inches	Decimal Inches	mm
		0.0050	0.13
97		0.0060	0.15
94		0.0070	0.18
89		0.0090	0.23
87		0.0100	0.25
83		0.0120	0.30
81		0.0130	0.33
		0.0150	0.38
	1/64	0.0156	0.40
78		0.0160	0.41
		0.0170	0.43
77		0.0180	0.46
76		0.0200	0.51
72		0.0250	0.64
71		0.0260	0.66
68		0.0310	0.79
	1/32	0.0313	0.80
65		0.0350	0.89

Drill Number	Fractional Inches	Decimal Inches	mm
65		0.0350	0.89
62		0.0380	0.97
		0.0394	1.00
60		0.0400	1.02
	3/64	0.0469	1.19
		0.0480	1.22
		0.0500	1.27
		0.0530	1.35
	1/16	0.0625	1.59
52		0.0630	1.60
		0.0787	2.00
	3/32	0.0938	2.38
		0.1181	3.00
	1/8	0.1250	3.18
	5/32	0.1562	3.97
22		0.1570	3.99
	3/16	0.1875	4.76
	1/4	0.2500	6.35