DRILL AND TAP CHART SAE

When drilling and tapping a hole you need to drill your workpiece to the right size and in order to tap your workpiece to the correct size. Below is an SAE drill and tap chart on both coarse thread and fine thread. You can find a metric drill and tap chart here. You can also find an article on how to drill and tap a hole properly here.

COARSE THREAD

TAP SIZE	DRILL SIZE	DECIMAL	MILLIMETERS
1-64	#53	0.0595	1.511
2-56	#50	0.0700	1.778
3-48	#47	0.0785	1.994
4-40	#43	0.0890	2.261
5-40	#38	0.1015	2.578
6-32	#36	0.1065	2.705
8-32	#29	0.1360	3.454
10-24	#26	0.1470	3.734
12-24	#16	0.1770	4.496
1/4-20	#7	0.2010	5.105
5/16-18	F	0.2570	6.528
3/8-16	5/16	0.3125	7.938
7/16-14	U	0.3680	9.347
1/2-13	27/64	0.4219	10.716
9/16-12	31/64	0.4844	12.304
5/8-11	17/32	0.5312	13.492
3/4-10	21/32	0.6562	16.667
7/8-9	49/64	0.7656	19.446
1-8	7/8	0.8750	22.225
1 1/8-7	63/64	0.9844	25.004
1 1/4-7	1 7/64	1.1094	28.179
1 3/8-6	1 7/32	1.2187	30.955
1 1/2-6	1 11/32	1.3437	34.130
1 3/4 -5	1 9/16	1.5625	39.688
2-4 1/2	1 25/32	1.7812	45.242

FINE THREAD

TAP SIZE	DRILL SIZE	DECIMAL	MILLIMETERS
0-80	3/64	0.0469	1.191
1-72	#53	0.0595	1.511
2-64	#50	0.0700	1.778
3-56	#46	0.0810	2.057
4-48	#42	0.0953	2.375
5-44	#37	0.1040	2.642
6-40	#33	0.1130	2.870
8-36	#29	0.1360	3.454
10-32	#21	0.1590	4.039
12-28	#15	0.1800	4.572
1/4-28	#3	0.2130	5.410
5/16-24	I	0.2720	6.909
3/8-24	Q	0.3320	8.433
7/16-20	25/64	0.3906	9.921
1/2-20	29/64	0.4531	11.509
9/16-18	33/64	0.5156	13.096
5/8-18	37/64	0.5781	14.684
3/4-16	11/16	0.6875	17.463
7/8-14	13/16	0.8125	20.638
1-12	59/64	0.9219	23.416
1 1/8-12	1 3/64	1.0469	26.591
1 1/4-12	1 11/64	1.1719	29.766
1 3/8-12	1 19/64	1.2969	32.941
1 1/2-12	1 27/64	1.4219	36.116