tap drill size chart, drill tap size chart

A Complete Drill Tap Chart

When your job requires tapping a hole in metal, predrilling is a must.  Once you determine what size tap is needed you will have to know what size of hole to pre-drill for that tap.  Our drill tap chart below will assist you in finding the correct size drill bit for fractional, taper pipe, and metric taps.


Fractional Drill Tap Chart

Fractional or
Drill Size
Decimal
Equivalent
Tap Size Fractional or
Drill Size
Decimal
Equivalent
Tap Size
80 .0135 3 .2130 1/4″-28
79 .0145 7/32″ .2188
1/64″ .0156 2 .2210
78 .0160 1 .2280
77 .0180 A .2340
76 .0200 15/64″ .2344
75 .0210 B .2380
74 .0225 C .2420
73 .0240 D .2460
72 .0250 1/4″,E .2500
71 .0260 F .2570 5/16″-18
70 .0292 G .2610
69 .0310 17/64″ .2656
68 .0312 H .2660
1/32″ .0320 I .2720 5/16″-24
67 .0330 J .2770
66 .0350 K .2810
65 .0360 9/32″ .2812
64 .0370 L .2900
63 .0380 M .2950
62 .0390 19/64″ .2969
61 .0400 N .3020
60 .0410 5/16″ .3125 3/8″-16
59 .0420 O .3160
58 .0430 P .3230
57 .0465 21/64″ .3281
56 0.465 Q .3320 3/8″-24
3/64″ .0469 0-80 R .3390
55 .0520 11/32″ .3438
54 .0550 S .3480
53 .0595 1-64,72 T .3580
1/16″ .0625 23/64″ .3594
52 .0635 U .3680 7/16″-14
51 .0670 3/8″ .3750
50 .0700 2-56,64 V .3770
49 .0730 W .3860
48 .0760 25/64″ .3906 7/16″-20
5/64″ .0781 X .3970
47 .0785 3-48 Y .4040
46 .0810 13/32″ .4062
45 .0820 3-56 Z .4130
44 .0860 27/64″ .4219 1/2″-13
43 .0890 4-40 7/16″ .4375
42 .0935 4-48 29/64″ .4531 1/2″-20
3/32″ .0938 15/32″ .4688
41 .0960 31/64″ .4844 9/16″-12
40 .0980 1/2″ .5000
39 .0995 33/64″ .5156 9/16″-18
38 .1015 5-40 17/32″ .5312 5/8″-11
37 .1040 5-44 35/64″ .5469
36 .1065 6-32 9/16″ .5625
7/64″ .1094 37/64″ .5781 5/8″-18
35 .1100 19/32″ .5938
34 .1110 39/64″ .6094
33 .1130 6-40 5/8″ .6250
32 .1160 41/64″ .6406
31 .1200 21/32″ .6562 3/4″-10
1/8″ .1250 43/64″ .6719
30 .1285 11/16″ .6875 3/4″-16
29 .1360 8-32,36 45/64″ .7031
28 .1405 23/32″ .7188
9/64″ .1406 47/64″ .7344
27 .1440 3/4″ .7500
26 .1470 49/64” .7656 7/8″-9
25 .1495 10-24 25/32″ .7812
24 .1520 51/64″ .7969
23 .1540 13/16″ .8125 7/8″-14
5/32″ .1562 53/64″ .8281
22 .1570 27/32″ .8438
21 .1590 10-32 55/64″ .8594
20 .1610 7/8″ .8750 1″-8
19 .1660 57/64″ .8906
18 .1695 29/32″ .9062
11/64″ .1719 59/64″ .9219
17 .1730 15/16″ .9375
16 .1770 12-24 61/64″ .9531
15 .1800 31/32″ .9688
14 .1820 12-28 63/64″ .9844 1-1/8″-7
13 .1850 1″ 1.0000
3/16″ .1875 1-3/64″ 1.0469 1-1/8″-12
12 .1890 1-7/64″ 1.1094 1-1/4″-7
11 ..1910 1-1/8″ 1.1250
10 .1935 1-11/64″ 1.1719 1-1/4″-12
9 .1960 1-7/32″ 1.2188 1-3/8″-6
8 .1990 1-1/4″ 1.2500
7 .2010 1/4″-20 1-19/64″ 1.2969 1-3/8″-12
13/64″ .2031 1-11/32″ 1.3438 1-1/2″-6
6 .2040 1-3/8″ 1.3750
5 .2055 1-27/64″ 1.4219 1-1/2″-12
4 .2090 1-1/2″ 1.5000

Pipe Thread Drill Tap Chart

Taper Pipe
Thread Size
Drill Size (in)
1/8″-27 11/32″
1/4″-18 7/16″
3/8″-18 37/64″
1/2″-14 23/32″
3/4″-14 59/64″
1″-11-1/2 1-5/32″
1-1/4″-11-1/2 1-1/2″
1-1/2″-11-1/2 1-3/4″
2″-11-1/2 2-7/32″
2-1/2″-8 2-21/32″
3″-8 3-1/4″
3-1/2″-8 3-3/4″
4″-8 4-1/4″

Metric Thread Drill Tap Chart

Metric Tap Size Drill Size (mm) Decimal
Equivalent (in)
M1.6X0.35 1.25 .0492
M1.8X0.35 1.45 .0571
M2X0.4 1.60 .0630
M2.2X0.45 1.75 .0689
M2.5X0.45 2.05 .0807
M3X0.5 2.50 .0984
M3.5X0.6 2.90 .1142
M4X0.7 3.30 .1299
M4.5X0.75 3.70 .1457
M5X0.8 4.20 .1654
M6X1 5.00 .1968
M7X1 6.00 .2362
M8X1.25 6.70 .2638
M8X1.25 7.00 .2756
M10X1.5 8.50 .3346
M10X1.25 8.70 .3425
M12X1.75 10.20 .4016
M12.1.25 10.80 .4252
M14X2 12.00 .4724
M14X1.5 12.50 .4921
M16X2 14.00 .5512
M16X1.5 14.50 .5709
M18X2.5 15.50 .6102
M18X1.5 16.50 .6496
M20X2.5 17.50 .6890
M20X1.5 18.50 .7283
M22X2.5 19.50 .7677
M22X1.5 20.50 .8071
M24X3 21.00 .8268
M24X2 22.00 .8661
M27X3 24.00 .9449
M27X2 25.00 .9843
M30X3.5 26.50 1.0433
M30X2 28.00 1.1024
M33X3.5 29.50 1.1614
M33X2 31.00 1.2205
M36X4 32.00 1.2598
M36X3 33.00 1.2992
M39X4 35.00 1.3780
M39X3 36.00 1.4173

 

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