Inch, Metric & Wire Gauge Drill Sizes & Decimal Equivalents
David Castro
Charts and Infographics
June 1st, 2023
1 minute read
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Welcome to the world of Inch, Metric & Wire Gauge Drill Sizes & Decimal Equivalents . Let this guide be your ultimate companion. Understanding the precise measurements and decimal equivalents of tap drill sizes is essential for achieving accurate and snug fits in various applications. Dive into this informative resource so you can drill with confidence and precision. Inch Metric Drill Decimal Equivalents...
Drill Size
Decimal
Drill Size
Decimal
Drill Size
Decimal
Drill Size
Decimal
1/64"
0.0156
26
0.1470
K
0.2810
37/64"
0.5781
0.5mm
0.0197
25
0.1495
9/32"
0.2812
15mm
0.5906
1/32"
0.0312
24
0.1520
L
0.2900
19/32"
0.5938
1mm
0.0394
23
0.1540
M
0.2950
39/64"
0.6094
60
0.0400
5/32"
0.1562
7.5mm
0.2953
15.5mm
0.6102
59
0.0410
22
0.1570
19/64"
0.2969
5/8"
0.6250
58
0.0420
4mm
0.1575
N
0.3020
16mm
0.6299
57
0.0430
21
0.1590
5/16"
0.3125
41/64"
0.6406
56
0.0465
20
0.1610
8mm
0.3150
16.5mm
0.6496
3/64"
0.0469
19
0.1660
O
0.3160
21/32"
0.6562
55
0.0520
18
0.1695
P
0.3230
17mm
0.6693
54
0.0550
11/64"
0.1719
21/64"
0.3281
43/64"
0.6719
1.5mm
0.0591
17
0.1730
Q
0.3320
11/16"
0.6875
53
0.0595
16
0.1770
8.5mm
0.3346
17.5mm
0.6890
1/16"
0.0625
4.5mm
0.1772
R
0.3390
45/64"
0.7031
52
0.0635
15
0.1800
11/32"
0.3438
18mm
0.7087
51
0.0670
14
0.1820
S
0.3480
23/32"
0.7188
50
0.0700
13
0.1850
9mm
0.3543
18.5mm
0.7283
49
0.0730
3/16"
0.1875
T
0.3580
47/64"
0.7344
48
0.0760
12
0.1890
23/64"
0.3594
19mm
0.7480
5/64"
0.0781
11
0.1910
U
0.3680
3/4"
0.7500
47
0.0785
10
0.1935
9.5mm
0.3740
49/64"
0.7656
2mm
0.0787
9
0.1960
3/8"
0.3750
19.5mm
0.7677
46
0.0810
5mm
0.1969
V
0.3770
25/32"
0.7812
45
0.0820
8
0.1990
W
0.3860
20mm
0.7874
44
0.0860
7
0.2010
25/64"
0.3906
51/64"
0.7969
43
0.0890
13/64"
0.2031
10mm
0.3937
20.5mm
0.8071
42
0.0935
6
0.2040
X
0.3970
13/16"
0.8125
3/32"
0.0938
5
0.2055
Y
0.4040
21mm
0.8268
41
0.0960
4
0.2090
13/32"
0.4062
53/64"
0.8281
40
0.0980
3
0.2130
Z
0.4130
27/32"
0.8438
2.5mm
0.0984
5.5mm
0.2165
10.5mm
0.4134
21.5mm
0.8465
39
0.0995
7/32"
0.2188
27/64"
0.4219
55/64"
0.8594
38
0.1015
2
0.2210
11mm
0.4331
22mm
0.8661
37
0.1040
1
0.2280
7/16"
0.4375
7/8"
0.8750
36
0.1065
A
0.2340
11.5mm
0.4528
22.5mm
0.8858
7/64"
0.1094
15/64"
0.2344
29/64"
0.4531
57/64"
0.8906
35
0.1100
6mm
0.2362
15/32"
0.4688
23mm
0.9055
34
0.1110
B
0.2380
12mm
0.4724
29/32"
0.9062
33
0.1130
C
0.2420
31/64"
0.4844
59/64"
0.9219
32
0.1160
D
0.2460
12.5mm
0.4921
23.5mm
0.9252
3mm
0.1181
1/4" & E 0.2500
1/2"
0.5000
15/16"
0.9375
31
0.1200
6.5mm
0.2559
13mm
0.5118
24mm
0.9449
1/8"
0.1250
F
0.2570
33/64"
0.5156
61/64"
0.9531
30
0.1285
G
0.2610
17/32"
0.5313
24.5mm
0.9646
29
0.1360
17/64"
0.2656
13.5mm
0.5315
31/32"
0.9688
3.5mm
0.1378
H
0.2260
35/64"
0.5469
25mm
0.9843
28
0.1405
I
0.2720
14mm
0.5512
63/64"
0.9844
9/64"
0.1406
7mm
0.2756
9/16"
0.5625
1"
1.0000
27
0.1440
J
0.2770
14.5mm
0.5709
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