Standard Tap Drill / Clearance Holes Table

Thread Tap & Clearance Hole Table

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Machine
Screw
Size Tap Drills Clearance Hole Drills

Aluminum,
Brass &
Plastics
75%Thread

Stainless Steel,
Steels & Iron

50% Thread
All Materials

Close Fit Free Fit

No. or Dia. Threads
Per In. Major
Dia. Minor
Dia. Drill
Size Decimal
Equiv. Drill
Size Decimal
Equiv. Drill
Size Decimal
Equiv. Drill
Size Decimal
Equiv.

0 80 .0600 .0447 3/64 .0469 55 .0520 52 .0635 50 .0700

1 64 .0730 .0538 53 .0595 1/16 .0625 48 .0760 46 .0810

72 .0560 53 .0595 52 .0635

2 56 .0860 .0641 50 .0700 49 .0730 43 .0890 41 .0960

64 .0668 50 .0700 48 .0760

3 48 .0990 .0734 47 .0785 44 .0860 37 .1040 35 .1100

56 .0771 45 .0820 43 .0890

4 40 .1120 .0813 43 .0890 41 .0960 32 .1160 30 .1285

48 .0864 42 .0935 40 .0980

5 40 .1250 .0943 38 .1015 7/64 .1094 30 .1285 29 .1360

44 .0971 37 .1040 35 .1100

6 32 .1380 .0997 36 .1065 32 .1160 27 .1440 25 .1495

40 .1073 33 .1130 31 .1200

8 32 .1640 .1257 29 .1360 27 .1440 18 .1695 16 .1770

36 .1299 29 .1360 26 .1470

10 24 .1900 .1389 25 .1495 20 .1610 9 .1960 7 .2010

32 .1517 21 .1590 18 .1695

12 24 .2160 .1649 16 .1770 12 .1890 2 .2210 1 .2280

28 .1722 14 .1820 10 .1935

32 .1777 13 .1850 9 .1960

1/4 20 .2500 .1887 7 .2010 7/32 .2188 F .2570 H .2660

28 .2062 3 .2130 1 .2280

32 .2117 7/32 .2188 1 .2280

5/16 18 .3125 .2443 F .2570 J .2770 P .3230 Q .3320

24 .2614 I .2720 9/32 .2812

32 .2742 9/32 .2812 L .2900

3/8 16 .3750 .2983 5/16 .3125 Q .3320 W .3860 X .3970

24 .3239 Q .3320 S .3480

32 .3367 11/32 .3438 T .3580

7/16
14
.4375
.3499 U .3680 25/64 .3906
29/64

.4531

15/32

.4687

20 .3762 25/64 .3906 13/32 .4062

28 .3937 Y .4040 Z .4130

1/2 13 .5000 .4056 27/64 .4219 29/64 .4531 33/64 .5156 17/32 .5312

20 .4387 29/64 .4531 15/32 .4688

28 .4562 15/32 .4688 15/32 .4688

9/16 12 .5625 .4603 31/64 .4844 33/64 .5156 37/64 .5781 19/32 .5938

18 .4943 33/64 .5156 17/32 .5312

24 .5114 33/64 .5156 17/32 .5312

5/8 11 .6250 .5135 17/32 .5312 9/16 .5625 41/64 .6406 21/32 .6562

18 .5568 37/64 .5781 19/32 .5938

24 .5739 37/64 .5781 19/32 .5938

11/16 24 .6875 .6364 41/64 .6406 21/32 .6562 45/64 .7031 23/32 .6562

3/4
10
.7500
.6273 21/32 .6562 11/16 .6875
49/64

.7656

25/32

.7812

16 .6733 11/16 .6875 45/64 .7031

20 .6887 45/64 .7031 23/32 .7188

13/16 20 .8125 .7512 49/64 .7656 25/32 .7812 53/64 .8281 27/32 .8438

7/8 9 .8750 .7387 49/64 .7656 51/64 .7969 57/64 .8906 29/32 .9062

14 .7874 13/16 .8125 53/64 .8281

20 .8137 53/64 .8281 27/32 .8438

15/16 20 .9375 .8762 57/64 .8906 29/32 .9062 61/64 .9531 31/32 .9688

1 8 1.000 .8466 7/8 .8750 59/64 .9219 1-1/64 1.0156 1-1/32 1.0313

12 .8978 15/16 .9375 61/64 .9531

20 .9387 61/64 .9531 31/32 .9688

1-1/16 18 1.0625 .9943 1.000 1.000 1-1/64 1.0156 1-5/64 1.0781 1-3/32 1.0938

1-1/8 7 1.1250 .9497 63/64 .9844 1-1/32 1.0313 1-9/64 1.1406 1-5/32 1.1562

12 1.0228 1-3/64 1.0469 1-5/64 1.0781

18 1.0568 1-1/16 1.0625 1-5/64 1.0781

1-3/16 18 1.1875 1.1193 1-1/8 1.1250 1-9/64 1.1406 1-13/64 1.2031 1-7/32 1.2188

1-1/4
7
1.2500
1.0747 1-7/64 1.1094 1-5/32 1.1562
1-17/64

1.2656

1-9/32

1.2812

12 1.1478 1-11/64 1.1719 1-13/64 1.2031

18 1.1818 1-3/16 1.1875 1-13/64 1.2031

1-5/16 18 1.3125 1.2443 1-1/4 1.2500 1-17/64 1.2656 1-21/64 1.3281 1-11/32 1.3438

1-3/8 6 1.3750 1.1705 1-7/32 1.2187 1-17/64 1.2656 1-25/64 1.3906 1-13/32 1.4062

12 1.2728 1-19/64 1.2969 1-21/64 1.3281

18 1.3068 1-5/16 1.3125 1-21/64 1.3281

1-7/16 18 1.4375 1.3693 1-3/8 1.3750 1-25/64 1.3906 1-29/64 1.4531 1-15/32 1.4688

1-1/2 6 1.500 1.2955 1-11/32 1.3437 1-25/64 1.3906 1-33/64 1.5156 1-17/32 1.5312

12 1.3978 1-27/64 1.4219 1-7/16 1.4375

18 1.4318 1-7/16 1.4375 1-29/64 1.4531

1-9/16 18 1.5625 1.4943 1-12 1.500 1-33/64 1.5156 1-37/64 1.5781 1-19/32 1.5938

1-5/8 18 1.625 1.5568 1-9/16 1.5625 1-37/64 1.5781 1-41/64 1.6406 1-21/32 1.6562

1-11/16 18 1.6875 1.6193 1-5/8 1.6250 1-41/64 1.6406 1-45/64 1.7031 1-23/32 1.7188

1-3/4 5 1.750 1.5046 1-9/16 1.5625 1-5/8 1.6250 1-49/64 1.7659 1-25/32 1.7812

Printing page it should autoscale to paper width..Or link to duplicate chart but resized to paper width, may print better
TO Drill bit size chart, ANSI/ metric

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Machine Screw Size				Tap Drills				Clearance Hole Drills
				Aluminum, Brass & Plastics 75%Thread		Stainless Steel, Steels & Iron 50% Thread		All Materials
				Aluminum, Brass & Plastics 75%Thread		Stainless Steel, Steels & Iron 50% Thread		Close Fit		Free Fit
No. or Dia.	Threads Per In.	Major Dia.	Minor Dia.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.
0	80	.0600	.0447	3/64	.0469	55	.0520	52	.0635	50	.0700
1	64	.0730	.0538	53	.0595	1/16	.0625	48	.0760	46	.0810
1	72	.0730	.0560	53	.0595	52	.0635	48	.0760	46	.0810
2	56	.0860	.0641	50	.0700	49	.0730	43	.0890	41	.0960
2	64	.0860	.0668	50	.0700	48	.0760	43	.0890	41	.0960
3	48	.0990	.0734	47	.0785	44	.0860	37	.1040	35	.1100
3	56	.0990	.0771	45	.0820	43	.0890	37	.1040	35	.1100
4	40	.1120	.0813	43	.0890	41	.0960	32	.1160	30	.1285
4	48	.1120	.0864	42	.0935	40	.0980	32	.1160	30	.1285
5	40	.1250	.0943	38	.1015	7/64	.1094	30	.1285	29	.1360
5	44	.1250	.0971	37	.1040	35	.1100	30	.1285	29	.1360
6	32	.1380	.0997	36	.1065	32	.1160	27	.1440	25	.1495
6	40	.1380	.1073	33	.1130	31	.1200	27	.1440	25	.1495
8	32	.1640	.1257	29	.1360	27	.1440	18	.1695	16	.1770
8	36	.1640	.1299	29	.1360	26	.1470	18	.1695	16	.1770
10	24	.1900	.1389	25	.1495	20	.1610	9	.1960	7	.2010
10	32	.1900	.1517	21	.1590	18	.1695	9	.1960	7	.2010
12	24	.2160	.1649	16	.1770	12	.1890	2	.2210	1	.2280
	28		.1722	14	.1820	10	.1935
	32		.1777	13	.1850	9	.1960
1/4	20	.2500	.1887	7	.2010	7/32	.2188	F	.2570	H	.2660
	28		.2062	3	.2130	1	.2280
	32		.2117	7/32	.2188	1	.2280
5/16	18	.3125	.2443	F	.2570	J	.2770	P	.3230	Q	.3320
	24		.2614	I	.2720	9/32	.2812
	32		.2742	9/32	.2812	L	.2900
3/8	16	.3750	.2983	5/16	.3125	Q	.3320	W	.3860	X	.3970
	24		.3239	Q	.3320	S	.3480
	32		.3367	11/32	.3438	T	.3580
7/16	14	.4375	.3499	U	.3680	25/64	.3906	29/64	.4531	15/32	.4687
	20		.3762	25/64	.3906	13/32	.4062
	28		.3937	Y	.4040	Z	.4130
1/2	13	.5000	.4056	27/64	.4219	29/64	.4531	33/64	.5156	17/32	.5312
	20		.4387	29/64	.4531	15/32	.4688
	28		.4562	15/32	.4688	15/32	.4688
9/16	12	.5625	.4603	31/64	.4844	33/64	.5156	37/64	.5781	19/32	.5938
	18		.4943	33/64	.5156	17/32	.5312
	24		.5114	33/64	.5156	17/32	.5312
5/8	11	.6250	.5135	17/32	.5312	9/16	.5625	41/64	.6406	21/32	.6562
	18		.5568	37/64	.5781	19/32	.5938
	24		.5739	37/64	.5781	19/32	.5938
11/16	24	.6875	.6364	41/64	.6406	21/32	.6562	45/64	.7031	23/32	.6562
3/4	10	.7500	.6273	21/32	.6562	11/16	.6875	49/64	.7656	25/32	.7812
	16		.6733	11/16	.6875	45/64	.7031
	20		.6887	45/64	.7031	23/32	.7188
13/16	20	.8125	.7512	49/64	.7656	25/32	.7812	53/64	.8281	27/32	.8438
7/8	9	.8750	.7387	49/64	.7656	51/64	.7969	57/64	.8906	29/32	.9062
	14		.7874	13/16	.8125	53/64	.8281
	20		.8137	53/64	.8281	27/32	.8438
15/16	20	.9375	.8762	57/64	.8906	29/32	.9062	61/64	.9531	31/32	.9688
1	8	1.000	.8466	7/8	.8750	59/64	.9219	1-1/64	1.0156	1-1/32	1.0313
	12		.8978	15/16	.9375	61/64	.9531
	20		.9387	61/64	.9531	31/32	.9688
1-1/16	18	1.0625	.9943	1.000	1.000	1-1/64	1.0156	1-5/64	1.0781	1-3/32	1.0938
1-1/8	7	1.1250	.9497	63/64	.9844	1-1/32	1.0313	1-9/64	1.1406	1-5/32	1.1562
	12		1.0228	1-3/64	1.0469	1-5/64	1.0781
	18		1.0568	1-1/16	1.0625	1-5/64	1.0781
1-3/16	18	1.1875	1.1193	1-1/8	1.1250	1-9/64	1.1406	1-13/64	1.2031	1-7/32	1.2188
1-1/4	7	1.2500	1.0747	1-7/64	1.1094	1-5/32	1.1562	1-17/64	1.2656	1-9/32	1.2812
	12		1.1478	1-11/64	1.1719	1-13/64	1.2031
	18		1.1818	1-3/16	1.1875	1-13/64	1.2031
1-5/16	18	1.3125	1.2443	1-1/4	1.2500	1-17/64	1.2656	1-21/64	1.3281	1-11/32	1.3438
1-3/8	6	1.3750	1.1705	1-7/32	1.2187	1-17/64	1.2656	1-25/64	1.3906	1-13/32	1.4062
	12		1.2728	1-19/64	1.2969	1-21/64	1.3281
	18		1.3068	1-5/16	1.3125	1-21/64	1.3281
1-7/16	18	1.4375	1.3693	1-3/8	1.3750	1-25/64	1.3906	1-29/64	1.4531	1-15/32	1.4688
1-1/2	6	1.500	1.2955	1-11/32	1.3437	1-25/64	1.3906	1-33/64	1.5156	1-17/32	1.5312
	12		1.3978	1-27/64	1.4219	1-7/16	1.4375
	18		1.4318	1-7/16	1.4375	1-29/64	1.4531
1-9/16	18	1.5625	1.4943	1-12	1.500	1-33/64	1.5156	1-37/64	1.5781	1-19/32	1.5938
1-5/8	18	1.625	1.5568	1-9/16	1.5625	1-37/64	1.5781	1-41/64	1.6406	1-21/32	1.6562
1-11/16	18	1.6875	1.6193	1-5/8	1.6250	1-41/64	1.6406	1-45/64	1.7031	1-23/32	1.7188
1-3/4	5	1.750	1.5046	1-9/16	1.5625	1-5/8	1.6250	1-49/64	1.7659	1-25/32	1.7812