Decimal Equivalents

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Drill Size Decimal Inches
97 0.0059
.15mm 0.0059
96 0.0063
.16mm 0.0063
95 0.0067
.17mm 0.0067
94 0.0071
.18mm 0.0071
93 0.0075
.19mm 0.0075
92 0.0079
.2mm 0.0079
91 0.0083
.21mm 0.0083
90 0.0087
.22mm 0.0087
89 0.0091
.23mm 0.0091
.24mm 0.0094
88 0.0095
.25mm 0.0098
87 0.0100
.26mm 0.0102
86 0.0105
.27mm 0.0106
85 0.0110
.28mm 0.0110
.29mm 0.0114
84 0.0115
.3mm 0.0118
83 0.0120
82 0.0125
.32mm 0.0126
81 0.0130
.34mm 0.0134
80 0.0135
.35mm 0.0138
.36mm 0.0142
79 0.0145
.38mm 0.0150
1/64 0.0156
.4mm 0.0157
78 0.0160
.42mm 0.0165
.44mm 0.0173
.45mm 0.0177
77 0.0180
.46mm 0.0181
.48mm 0.0189
.5mm 0.0197
76 0.0200
75 0.0210
.55mm 0.0217
74 0.0225
.6mm 0.0236
73 0.0240
72 0.0250
.65mm 0.0256
71 0.0260
.7mm 0.0276
70 0.0280
69 0.0292
.75mm 0.0295
68 0.0310
1/32 0.0312
.8mm 0.0315
67 0.0320
66 0.0330
.85mm 0.0335
65 0.0350
.9mm 0.0354
64 0.0360
63 0.0370
.95mm 0.0374
62 0.0380
61 0.0390
1mm 0.0394
60 0.0400
59 0.0410
1.05mm 0.0413
Drill Size Decimal Inches Tap Size
58 0.0420
57 0.0430
1.1mm 0.0433
1.15mm 0.0453
56 0.0465
3/64 0.0469 #0-80
1.2mm 0.0472
1.25mm 0.0492 M1.6×0.35
1.3mm 0.0512
55 0.0520
1.35mm 0.0531
54 0.0550
1.4mm 0.0551
1.45mm 0.0571 M1.8×0.35
1.5mm 0.0591
53 0.0595 #1-64,72
1.55mm 0.0610
1/16 0.0625
1.6mm 0.0630 M2x0.4
52 0.0635
1.65mm 0.0650
1.7mm 0.0669
51 0.0670 #2-56
1.75mm 0.0689 M2.2×0.45
50 0.0700 #2-64
1.8mm 0.0709
1.85mm 0.0728
49 0.0730
1.9mm 0.0748 M2.3x.04
48 0.0760
1.95mm 0.0768
5/64 0.0781
47 0.0785 #3-48
2mm 0.0787
2.05mm 0.0807 M2.5×0.45
46 0.0810
45 0.0820 #3-56
2.1mm 0.0827
2.15mm 0.0846 M2.6×0.45
44 0.0860 #4-36
2.2mm 0.0866
2.25mm 0.0886
43 0.0890 #4-40
2.3mm 0.0906
2.35mm 0.0925
42 0.0936 #4-48
3/32 0.0938
2.4mm 0.0945
41 0.0960
2.45mm 0.0965
40 0.0980
2.5mm 0.0984 M3x0.5
39 0.0995
38 0.1015 #5-40
2.6mm 0.1024
37 0.1040 #5-44
2.7mm 0.1063
36 0.1065 #6-32
2.75mm 0.1083
7/64 0.1094
35 0.1100
2.8mm 0.1102
34 0.1110
33 0.1130 #6-40
2.9mm 0.1142 M3.5×0.6
32 0.1160
3mm 0.1181
31 0.1200
3.1mm 0.1220
1/8 0.1250 5/32-32NS
3.2mm 0.1260
3.25mm 0.1280
30 0.1285 5/32-36NS
3.3mm 0.1299 M4x0.70
3.4mm 0.1339
29 0.1360 #8-32
3.5mm 0.1378
28 0.1405
9/64 0.1406
3.6mm 0.1417
Drill Size Decimal Inches Tap Size
27 0.1440
3.7mm 0.1457
26 0.1470 3/16-24NS
3.75mm 0.1476 M4.5×0.75
25 0.1495 #10-24
3.8mm 0.1496
24 0.1520
3.9mm 0.1535
23 0.1540
5/32 0.1562
22 0.1570 3/16-32NS
4mm 0.1575
21 0.1590 #10-32
20 0.1610
4.1mm 0.1614
4.2mm 0.1654 M5x0.8
19 0.1660
4.25mm 0.1673
4.3mm 0.1693
18 0.1695
11 64 0.1719
17 0.1730
4.4mm 0.1732
16 0.1770 #12-24
4.5mm 0.1772
15 0.1800
4.6mm 0.1811
14 0.1820 #12-28
13 0.1850
4.7mm 0.1850
4.75mm 0.1870
3/16 0.1875
4.8mm 0.1890
12 0.1890 7/32-32NS
11 0.1910
4.9mm 0.1929
10 0.1935
9 0.1960
5mm 0.1969 M6x1
8 0.1990
5.1m 0.2008
7 0.2010 1/4-20
13 64 0.2031
6 0.2040
5.2mm 0.2047
5 0.2055
5.25mm 0.2067 M6x0.75
5.3mm 0.2087
4 0.2090 1/4-24
5.4mm 0.2126
3 0.2130 1/4-28
5.5mm 0.2165
7/32 0.2188
5.6mm 0.2205
2 0.2210
5.7mm 0.2244
5.75mm 0.2264
1 0.2280
5.8mm 0.2283
5.9mm 0.2323
A 0.2340
15 64 0.2344
6mm 0.2362 M7x1
B 0.2380
6.1mm 0.2402
C 0.2420
6.2mm 0.2441
D 0.2460
6.25mm 0.2461 1/16-27NPT
6.3mm 0.2480
E 0.2500 1/16-27NPT
1/4 0.2500
6.4mm 0.2520
6.5mm 0.2559
F 0.2570 5/16-18NC
6.6mm 0.2598
G 0.2610
6.7mm 0.2638
17 64 0.2656
6.75mm 0.2657 M8x1.25
Drill Size Decimal Inches Tap Size
H 0.2660
6.8mm 0.2677
6.9mm 0.2717
I 0.2720 5/16-24NF
7mm 0.2756 M8x1
J 0.2770
7.1mm 0.2795
K 0.2810
9/32 0.2812 5/16-32NS
7.2mm 0.2835
7.25mm 0.2854
7.30mm 0.2874
L 0.2900
7.4mm 0.2913
M 0.2950
7.5mm 0.2953
19/64 0.2969
7.6mm 0.2992
N 0.3020
7.7mm 0.3031
7.75mm 0.3051 M9x1.25
7.8mm 0.3071
7.9mm 0.3110
5/16 0.3125 3/8-16NC
8mm 0.3150
O 0.3160
8.1mm 0.3189
8.2mm 0.3228
P 0.3230
8.25mm 0.3248
8.3mm 0.3268
21/64 0.3281
8.4mm 0.3307
Q 0.3320 3/8-24NF
8.5mm 0.3346 M10x1.5
8.6mm 0.3386
R 0.3390 1/8-27NPT
8.7mm 0.3425
11/32 0.3438
8.75mm 0.3445 M10x1.25
8.8mm 0.3465
S 0.3480 1/8-27NPT
8.9mm 0.3504
9mm 0.3543 M10x1.00
T 0.3580
9.1mm 0.3583
23/64 0.3594
9.2mm 0.3622
9.25mm 0.3642
9.3mm 0.3661
U 0.3680 7/16-14NC
9.4mm 0.3701
9.5mm 0.3740 M11x1.50
3/8 0.3750
V 0.3770
9.6mm 0.3780
9.7mm 0.3819
9.75mm 0.3839
9.8mm 0.3858
W 0.3860
9.9mm 0.3998
25/64 0.3906 7/16-20
10mm 0.3937 M12x1.75
X 0.3970
Y 0.4040
13/32 0.4062
Z 0.4130
10.5mm 0.4131 M12x1.25
27/64 0.4219 1/2-13
11mm 0.4331
7/16 0.4375 1/4-18NPT
11.5mm 0.4528
29/64 0.4531 1/4-18NPT 1/2-20
15/32 0.4688
12mm 0.4724 M14x2
31/64 0.4844 9/16-12
12.5mm 0.4921 M14x1.5
1/2 0.5000
13mm 0.5118 M14x1.25
33/64 0.5156 9/16-18
Drill Size Decimal Inches Tap Size
17/32 0.5312 5/8-11
13.5mm 0.5315
35/64 0.5469
14mm 0.5512 m16x2
9/16 0.5625
14.5mm 0.5709 M16x1.5
37/64 0.5781 3/8-18NPT 5/8-18NF
15mm 0.5906
19/32 0.5938 3/8-18NPS
39/64 0.6094
15.5mm 0.6102 M18x2.5
5/8 0.6250 11/16-16NS
16mm 0.6299 M18x20
41/64 0.6406
16.5mm 0.6496
21/32 0.6562 3/4-10NC
17mm 0.6693
43/64 0.6719
11/16 0.6875 3/4-16NF
17.5mm 0.6890 M20x2.5
45/64 0.7031
18mm 0.7087 M20x2.0
23/32 0.7188 1/2-14NPT
18.5mm 0.7283 M20x1.5
47/64 0.7344 1/2-14NPS
19mm 0.7480
3/4 0.7500
49/64 0.7656 7/8-9NC
19.5mm 0.7677 M22x2.5
25/32 0.7812
20mm 0.7874 M22x2.0
51/64 0.7969
20.5mm 0.8071 M22x1.5
13/16 0.8125 7/8-14NF
21mm 0.8268 M24x3
53/64 0.8281
27/32 0.8438
21.5mm 0.8465
55/64 0.8594
22mm 0.8661 M24x2
7/8 0.8750 1-8NC
22.25mm 0.8760
22.5mm 0.8858 M24x1.50
57/64 0.8906
23mm 0.9055
29/32 0.9062
59/64 0.9219 3/4-14NPT
23.5mm 0.9252
15/16 0.9375 3/4-14NPS
24mm 0.9449 >M27x3
61/64 0.9531
24.5mm 0.9646
31/32 0.9688
25mm 0.9843 M27x2
63/64 0.9844 1-1/8-7NC
1 1.00
25.5mm 1.0039
1-1/64 1.0156
26mm 1.0236
1-1/32 1.0312
26.5mm 1.0433 M30x3.5
1-3/64 1.0469 1-1/8-12NF
1-1/16 1.0625
27mm 1.0630
1-5/64 1.0781
27.5mm 1.0827
1-3/32 1.0938
28mm 1.1024 M30x2.0
1-7/64 1.1094 1-1/4-7NC
28.5mm 1.1220
1-1/8 1.1250
1-9/64 1.1406
29mm 1.1417
1-5/32 1.1562 1-11-1/2NPT
29.5mm 1.1614
1-11/64 1.1719 1-1/4-12NF