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Drill Sizes - Numbered
Drill bits are available in a number 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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RF Cafe Erie, PA (814) 833-1967
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