Imperial Machine Screw Sizes.

I had a hard time finding this in such a convenient table, so I've copied this here.

Machine Screw Size	Number of Threads Per Inch	Minor Dia.	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.	Major Dia.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.
0	.0600	80	.0447	3/64	.0469	55	.0520	52	.0635	50	.0700
1	.0730	64	.0538	53	.0595	1/16	.0625	48	.0760	46	.0810
72		.0560	53	.0595	52	.0635
2	.0860	56	.0641	50	.0700	49	.0730	43	.0890	41	.0960
64		.0668	50	.0700	48	.0760
3	.0990	48	.0734	47	.0785	44	.0860	37	.1040	35	.1100
56		.0771	45	.0820	43	.0890
4	.1120	40	.0813	43	.0890	41	.0960	32	.1160	30	.1285
48		.0864	42	.0935	40	.0980
5	.1250	40	.0943	38	.1015	7/64	.1094	30	.1285	29	.1360
44		.0971	37	.1040	35	.1100
6	.1380	32	.0997	36	.1065	32	.1160	27	.1440	25	.1495

Machine Screw Size	Number of Threads Per Inch	Minor Dia.	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.	Major Dia.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.
8	.1640	32	.1257	29	.1360	27	.1440	18	.1695	16	.1770
36		.1299	29	.1360	26	.1470
10	.1900	24	.1389	25	.1495	20	.1610	9	.1960	7	.2010
32		.1517	21	.1590	18	.1695
12	.2160	24	.1649	16	.1770	12	.1890	2	.2210	1	.2280
28		.1722	14	.1820	10	.1935
32		.1777	13	.1850	9	.1960
1/4	.2500	20	.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	.3125	18	.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	.3750	16	.2983	5/16	.3125	Q	.3320	W	.3860	X	.3970
24		.3239	Q	.3320	S	.3480
32		.3367	11/32	.3438	T	.3580

Machine Screw Size	Number of Threads Per Inch	Minor Dia.	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.	Major Dia.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.
7/16	.4375	14	.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	.5000	13	.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	.5625	12	.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	.6250	11	.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	.6875	24	.6364	41/64	.6406	21/32	.6562	45/64	.7031	23/32	.6562

Machine Screw Size	Number of Threads Per Inch	Minor Dia.	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.	Major Dia.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.
3/4	.7500	10	.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	.8125	20	.7512	49/64	.7656	25/32	.7812	53/64	.8281	27/32	.8438
7/8	.8750	9	.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	.9375	20	.8762	57/64	.8906	29/32	.9062	61/64	.9531	31/32	.9688
1	1.000	8	.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	1.0625	18	.9943	1.000	1.000	1-1/64	1.0156	1-5/64	1.0781	1-3/32	1.0938
1-1/8	1.1250	7	.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	1.1875	18	1.1193	1-1/8	1.1250	1-9/64	1.1406	1-13/64	1.2031	1-7/32	1.2188

Machine Screw Size	Number of Threads Per Inch	Minor Dia.	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.	Major Dia.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.	Drill Size	Decimal Equiv.
1-1/4	1.2500	7	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	1.3125	18	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	1.3750	6	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	1.4375	18	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	1.500	6	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	1.5625	18	1.4943	1-12	1.500	1-33/64	1.5156	1-37/64	1.5781	1-19/32	1.5938
	1.625	18	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	1.6875	18	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	1.750	5	1.5046	1-9/16	1.5625	1-5/8	1.6250	1-49/64	1.7659	1-25/32	1.7812

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