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Inch Decimal Wire MM Tap Drill Sizes
0.0059 97 0.15
0.0063 96 0.16
0.0067 95 0.17
0.0071 94 0.18
0.0075 93 0.19
0.0079 92 0.2
0.0083 91 0.21
0.0087 90 0.22
0.0091 89 0.23
0.0094 0.24
0.0095 88
0.0098 0.25
0.01 87
0.0102 0.26
0.0105 86
0.0106 0.27
0.011 85 0.28
0.0114 0.29
0.0115 84
0.0118 0.3
0.012 83
0.0125 82
0.0126 0.32
0.013 81
0.0134 0.34
0.0135 80
0.0138 0.35
0.0142 0.36
0.0145 79
0.015 0.38
1/64 0.0156
0.0157 0.4
0.016 78
0.0165 0.42
0.0173 0.44
0.0177 0.45
0.018 77
0.02 76
0.021 75
0.0225 74
0.024 73
0.025 72
0.0256 0.65
0.026 71
0.028 70
0.0292 69
0.031 68
1/32 0.0312
0.032 67
0.033 66
0.035 65
0.0354 0.9
0.036 64
0.037 63
0.0374 0.95
0.038 62
0.039 61
0.04 60
0.041 59
0.0413 1.05
0.042 58
0.043 57
0.0433 1.1
0.0453 1.15
0.0465 56
3/64 0.0469 #0-80
0.0472 1.2
0.0492 1.25
0.0512 1.3
0.052 55
0.0531 1.35
0.055 54 #1-64
0.0551 1.4
0.0571 1.45
0.0591 1.5
0.0595 53 #1-72
0.061 1.55
1/16 0.0625
0.0635 52
0.065 1.65
0.0669 1.7
0.067 51 #2-56
0.0689 1.75
0.07 50 #2-64
0.0709 1.8
0.0728 1.85
0.073 49
0.0748 1.9
0.076 48
5/64 0.0781 #3-48
0.0785 47
0.0787 2
0.0807 2.05
0.081 46 #3-56
0.082 45
0.0827 2.1
0.0846 2.15
0.086 44 #4-40
0.089 43
0.0935 42 #4-48
3/32 0.0938
0.096 41
0.0965 2.45
0.098 40 #5-40
0.0995 39
0.1015 38 #5-44
0.1024 2.6
0.104 37
0.1063 2.7
0.1065 36 #6-32
7/64 0.1094
0.11 35
0.1102 2.8
0.111 34 #6-40
0.113 33
0.1142 2.9
0.116 32
0.1181 3
0.12 31
0.122 3.1
1/8 0.125 5/32-
0.126 3.2 32NS
0.128 3.25
0.1285 30
0.136 29 #8-32
0.1378 3.5
0.1405 28
9/64 0.1406
0.144 27
0.1457 3.7
0.147 26 #10-24
0.1476 3.75
0.1495 25
0.1496 3.8
0.152 24
0.1535 3.9
0.154 23
5/32 0.1562
0.157 22 #10-32
0.1575 4
0.159 21
0.161 20
0.1614 4.1
0.1654 4.2
0.166 19
0.1673 4.25
0.1693 4.3
0.1695 18
11/64 0.1719
0.173 17
0.1732 4.4 #12-24
0.177 16
0.1772 4.5 7/32
0.18 15 -32NS
0.1811 4.6
0.182 14
0.185 13
0.187 4.75
3/16 0.1875
0.189 4.8
0.189 12
0.191 11
0.1929 4.9
0.1935 10
0.196 9
0.1969 5
0.199 8
0.2008 5.1
0.201 7
13/64 0.2031
0.204 6 1/4/20
0.2047 5.2
0.2055 5
0.2067 5.25
0.2087 5.3
0.209 4
0.2126 5.4
0.213 3
0.2165 5.5
7/32 0.2188 1/4/28
0.2205 5.6
0.221 2
0.2244 5.7
0.2264 5.75
0.228 1
0.2283 5.8
0.234 A
15/64 0.2344
0.2362 6
0.238 B
0.2402 6.1
0.242 C
0.2441 6.2
0.246 D
0.2461 6.25
1/4 0.25 E
0.252 6.4
0.2559 6.5
0.257 F
0.2598 6.6
0.261 G 5/16
0.2638 6.7 -18NC
17/64 0.2656
0.2657 6.75
0.266 H
0.2677 6.8
0.2717 6.9 5/16
0.272 I 24NS
0.2756 7
0.277 J 5/16
0.2795 7.1 32NS
0.281 K
9/32 0.2812
0.2835 7.2
0.2854 7.25
0.2874 7.3
0.29 L
0.2913 7.4
0.295 M
0.2953 7.5
19/64 0.2969
0.2992 7.6
0.302 N
0.3031 7.7
0.3051 7.75
0.3071 7.8
0.311 7.9 3/8-
5/16 0.3125 16NC
0.316 O
0.3189 8.1
0.3228 8.2
0.323 P
0.3248 8.25
0.3268 8.3
21/64 0.3281
0.3307 8.4 3/8-
0.332 Q 24NF
0.3246 8.5
0.3386 8.6 1/8-27
0.339 R Pipe
0.3425 8.7
11/32 0.3438
0.3445 8.75
0.3465 8.8
0.348 S
0.3504 8.9
0.3543 9
0.358 T
0.3583 9.1
23/64 0.3594
0.3622 9.2
0.3642 9.25
0.3661 9.3 7/16-
0.368 U 14NC
0.3701 9.4
0.374 9.5
3/8 0.375
0.377 V
0.378 9.6
0.3819 9.7
0.3839 9.75
0.3858 9.8 7/16-2
0.386 W
0.3898 9.9
25/64 0.3906
0.3937 10
0.397 X
0.404 Y
13/32 0.4062
0.413 Z 1/2-13
0.4134 10.5
27/64 0.4219 1/4-18
0.4331 11 Pipe
7/16 0.4375 1/2-20
0.4528 11.5
29/64 0.4531
15/32 0.4688 9/16-
0.4724 12 12
31/64 0.4844
0.4921 12.5
1/2 0.5
0.5118 13
33/64 0.5156 9/16-18
17/32 0.5312 5/8-11
0.5315 13.5
25/84 0.5469
0.5512 14
9/16 0.5625 5/8-
0.5709 14.5 18 NF
37/64 0.5781
0.5906 15 3/8-18
19/32 0.5938 Pipe
39/64 0.6094
5/8 0.625 11/16-
0.6299 16 16 NS
41/64 0.6406
0.6496 16.5
21/32 0.6562 3/4-10
0.6693 17
43/64 0.6719
11/16 0.6875 3/4-16
0.689 17.5 16 NS
45/64 0.7031
0.748 18
23/32 0.7188 1/2-14
0.7283 Pipe
47/64 0.7344
0.748 19
3/4 0.75
49/64 0.7656
0.7677 7/8-9
25/32 0.7812 NC
0.7874 20
51/64 0.7969
0.8071 20.5
13/16 0.8125 7/8-14
0.8268 21 NF
53/64 0.8281
27/32 0.8438
0.8465 21.5
55/64 0.8594
0.8661 22
7/8 0.875 1-8NC
0.8858 22.5
57/64 0.8906
0.9055 23
29/32 0.9062
59/64 0.9219 3/4-14
0.9252 23.5 Pipe
15/16 0.9375 1-14
0.9449 24 NF
61/64 0.9531
0.9646 24.5
31/32 0.9688
0.9843
63/64 0.9844 1-1/8-
1 1 7 NC
1-1/64 1.0039 25.5
1.0156
1.0236 26
1-1/32 1.0312
1.0433 26.5
1-3/64 1.0469 1-1/8-
1-1/16 1.0625 12 NF
1.063 27
1-5/64 1.0781
1.0827 27.5
1-3/32 1.0938
1.1024 28
1-7/64 1.1094 1-1/4
1.122 28.5 7 NC
1-1/8 1.125
1-9/64 1.1406
1.1417 29
1-5/32 1.1562 1-11
1.1614 29.5 1/2 Pipe
1-11/64 1.1719 1-1/4
12 NF
Decimal Equivalents
Tap Drill Sizes
Conversion Chart
Metric Size Drills
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
UNC (Coarse Thread) UNF (Fine Thread)
Pitch (TPI)Drill size (Inch)Pitch (TPI)Drill Size (Inch)
24-1/21-25/32121-59/64
1-3/451-35/64121-43/64
1-1/261-11/32121-27/64
1-3/861-7/32121-19/64
1-1/471-7/64121-11/64
1-1/8763/64121-1/32
187/81215/16
7/8949/641413/16
3/41021/321611/16
5/81117/321837/64
9/161231/641833/64
1/21327/642029/64
7/16140.368 (U)200.386 (W)
3/8165/16240.332 (Q)
5/16180.257 (F)240.272 (I)
1/4200.201 (#7)280.213 (#3)
#12240.173 (#17)280.180 (#15)
#10240.149 (#25)320.159 (#21)
#8320.136 (#29)360.136 (#29)
#6320.106 (#36)400.113 (#33)
#5400.099 (#39)440.104 (#37)
#4400.089 (#43)480.093 (#42)
#3485/64560.081 (#46)
#2560.067 (#51)640.070 (#50)
#1640.059 (#53)720.059 (#53)
#0--803/64
FractionDecimalMMLetter/Number
 0.0135 80
 0.0145 79
1/640.01560.396 
 0.0160 78
 0.0180 77
 0.0200 76
 0.0210 75
 0.0225 74
 0.0240 73
 0.0250 72
 0.0260 71
 0.0280 70
 0.0292 69
 0.0310 68
1/320.03120.793 
 0.0320 67
 0.0330 66
 0.0350 65
 0.0360 64
 0.0370 63
 0.0380 62
 0.0390 61
 0.0400 60
 0.0410 59
 0.0420 58
 0.0430 57
 0.0465 56
3/640.04681.190 
 0.0520 55
 0.0550 54
 0.0595 53
1/160.06251.587 
 0.0635 52
 0.0670 51
 0.0700 50
 0.0730 49
 0.0760 48
5/640.07811.984 
 0.0785 47
 0.0810 46
 0.0820 45
 0.0860 44
 0.0890 43
 0.0935 42
3/320.09372.381 
 0.0960 41
 0.0980 40
 0.0995 39
 0.1015 38
 0.1040 37
 0.1065 36
7/640.10932.778 
 0.1100 35
 0.1110 34
 0.1130 33
 0.1160 32
 0.1200 31
1/80.1253.175 
 0.1285 30
 0.1360 29
 0.1405 28
9/640.14063.571 
 0.1440 27
 0.1470 26
 0.1495 25
 0.1520 24
 0.1540 23
5/320.15623.968 
 0.1570 22
 0.1590 21
 0.1610 20
 0.1660 19
 0.1695 18
11/640.17184.365 
 0.1730 17
 0.1770 16
 0.1800 15
 0.1820 14
 0.1850 13
3/160.18754.762 
 0.1890 12
 0.1910 11
 0.1935 10
 0.1960 9
 0.1990 8
 0.2010 7
13/640.20315.159 
 0.2040 6
 0.2055 5
 0.2090 4
 0.2130 3
7/320.21875.556 
 0.2210 2
 0.2280 1
 0.2340 A
15/640.23435.953 
1/40.256.350 
 0.2380 B
 0.2420 C
 0.2460 D
 0.2500 E
 0.2570 F
 0.2610 G
17/640.26566.746 
 0.2660 H
 0.2720 I
 0.2770 J
 0.2810 K
9/320.28127.143 
 0.2900 L
 0.2950 M
19/640.29687.540 
 0.3020 N
5/160.31257.937 
 0.3160 O
 0.3230 P
21/640.32818.334 
 0.3320 Q
 0.3390 R
11/320.34378.731 
 0.3480 S
 0.3580 T
23/640.35939.128 
 0.3680 U
3/80.3759.525 
 0.3770 V
 0.3860 W
25/640.39069.921 
 0.3970 X
 0.4040 Y
13/320.406210.318 
 0.4130 Z
27/640.421810.715 
7/160.437511.112 
29/640.453111.509 
15/320.468711.906 
31/640.484312.303 
1/20.50012.700 
33/640.515613.096 
17/320.531213.493 
35/640.546813.890 
9/160.562514.287 
37/640.578114.684 
19/320.593715.081 
39/640.609315.478 
5/80.62515.875 
41/640.640616.271 
21/320.656216.668 
43/640.671817.065 
11/160.687517.462 
45/640.703117.859 
23/320.718718.256 
47/640.734318.653 
3/40.75019.050 
49/640.765619.446 
25/320.781219.843 
51/640.796820.240 
13/160.812520.637 
53/640.828121.034 
27/320.843721.431 
55/640.859321.828 
7/80.87522.225 
57/640.890622.621 
29/320.906223.018 
59/640.921823.415 
15/160.937523.812 
61/640.953124.209 
31/320.968724.606 
63/640.984325.003 
11.00025.400 
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
© 2024 Cobra Carbide Inc. All Rights Reserved.
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