DRILL TAP SIZES
*Sizes in Red are Most Available

SCREW SIZE	75%	70%	65%	MAJOR DIAMETER	MINOR DIAMETER	PITCH	CLEARANCE DRILL
0-80	56	56	3/64	.060	.0447	.0125	51
1-64	54	54	53	.073	.0538	.01563	47
1-72	54	54	53	.073	.0560	.01389	47
2-56	51	51	50	.086	.0641	.01786	42
2-64	50	-	49	.086	.0668	.01563	42
3-48	48	47	46	.099	.0734	.02083	36
3-56	47	46	45	.099	.0771	.01786	36
4-40	44	44	43	.112	.0813	.0250	31
4-48	43	42	3/32	.112	.0864	.02083	31
SCREW SIZE	75%	70%	65%	MAJOR DIAMETER	MINOR DIAMETER	PITCH	CLEARANCE DRILL
5-40	39	38	37	.125	.0943	.0250	29
5-44	38	-	37	.125	.0971	.02273	29
6-32	36	35	33	.138	.0997	.03125	25
6-40	34	33	32	.138	.1073	.0250	25
8-32	30	29	28	.164	.1257	.03125	16
8-36	29	-	28	.164	.1299	.02778	16
10-24	25	24	22	.190	.1389	.04167	13/64
10-32	21	20	19	.190	.1517	.03125	13/64
SCREW SIZE	75%	70%	65%	MAJOR DIAMETER	MINOR DIAMETER	PITCH	CLEARANCE DRILL
12-24	17	16	14	.216	.1649	.04167	7/32
12-28	15	14	12	.216	.1722	.03571	7/32
1/4-20	7	6	4	.250	.1887	.050	17/64
1/4-28	3	3	2	.250	.2062	.03571	17/64
5/16-18	F	G	H	.3125	.2443	.05556	21/64
5/16-24	I	I	9/32	.3125	.2614	.04167	21/64
3/8-16	5/16	O	P	.375	.2983	.06250	25/64
3/8-24	Q	R	11/32	.375	.3239	.04167	25/64
7/16-14	U	3/8	W	.4375	.3499	.07143	29/64
7/16-20	W	25/64	X	.4375	.3762	.050	29/64
SCREW SIZE	75%	70%	65%	MAJOR DIAMETER	MINOR DIAMETER	PITCH	CLEARANCE DRILL
1/2-13	-	7/16	7/16	.500	.4056	.07692	33/64
1/2-20	29/64	29/64	-	.500	.4387	.050	33/64
9/16-12	31/64	31/64	1/2	.5625	.4603	.08333	37/64
9/16-18	33/64	33/64	-	.5625	.4943	.05556	37/64
5/8-11	35/64	-	-	.625	.5135	.09091	41/64
5/8-18	-	-	37/64	.625	.5568	.05556	41/64
3/4-10	21/32	-	43/64	.750	.6273	.100	49/64
3/4-16	11/16	-	45/64	.750	.6733	.06250	49/64
7/8-9	49/64	-	-	.875	.7387	.11111	57/64
7/8-14	-	13/16	-	.875	.7874	.07143	57/64
1-8	7/8	-	29/32	1.00	.8466	.01250	1-1/64
1-12	29/32	59/64	15/16	1.00	.8960	.08333	1-1/64
SCREW SIZE	75%	70%	65%	MAJOR DIAMETER	MINOR DIAMETER	PITCH	CLEARANCE DRILL