TAP DRILL SIZES						METRIC TAP DRILL SIZES
TAP SIZE	DRILL SIZE	PROB. % THREAD	TAP SIZE	DRILL SIZE	PROB. % THREAD	TAP SIZE	DRILL SIZE	PROB. % THREAD	TAP SIZE	DRILL SIZE	PROB. % THREAD
0-80	56	74	3/8-24	Q	75	1.6x.35	1.25mm	69	9.0x1.25	7.75mm	73
	3/64	71		8.50mm	70	1.8x.35	1.45mm	69	10x1.5	8.5mm	71
1-64	54	81	7/16-14	U	75	2.0x.4	1.60mm	69		Q	75
	53	59	7/16-20	W	75		52	66	10x1.25	8.70mm	73
1-72	1.50mm	68		25/64	68	2.2x.45	1.75mm	70		11/32	71
	53	67	1/2-13	27/64	75	2.5x.45	2.05mm	69	11x1.5	9.50mm	70
2-56	51	74		11.00mm	64		46	67		3/8	71
	50	62	1/2-20	11.40mm	74	3.0x.5	2.50mm	68	12x1.75	10.20mm	74
2-64	50	70		29/64	67		40	70		Y	71
	49	56	9/16-12	15/32	84	3.5x.6	2.90mm	68	12x1.25	10.80mm	67
3-48	48	78		31/64	69		33	72		27/64	72
	5/64	70	9/16-18	1/2	82	4.0x.7	3.30mm	69	14x2.0	12.00mm	72
3-56	46	69		33/64	60		30	73		15/32	76
	45	56	5/8-11	17/32	76	4.5x.75	3.70mm	74	14x1.5	12.50mm	71
4-40	44	74		35/64	63		26	70	16x20	14.00mm	72
	43	65	5/8-18	9/16	82	5.0x.8	4.20mm	69		35/64	76
4-48	2.35mm	72		37/64	60		19	68	16x1.5	14.50mm	71
	42	61	11/16-11	19/32	75	5.5x.9	4.60mm	68	18x2.5	15.50mm	73
5-40	39	71	11/16-16	5/8	75		14	67		39/64	74
	38	65	3/4-10	41/64	81	6.0x.75	5.30mm	74	18x1.5	16.50mm	70
5-44	38	72		21/32	69		4	73	20x2.5	17.50mm	73
	37	63	3/4-16	11/16	72	6.0x1.0	5.00mm	70		11/16	74
6-32	36	72		17.50mm	70		9	71	22x2.5	19.50mm	73
	7/64	64	7/8-9	49/64	73	7.0x.75	6.30mm	74		49/64	75
6-40	33	69		25/32	62		D	72	24x3.0	21.00mm	73
	32	60	7/8-14	51/64	79	7.0x1.0	6.00mm	70		53/64	72
8-32	3.40mm	74		13/16	62		15/64	73	27x3.0	24.00mm	73
	29	62	1-8	7/8	74	8.0x1.25	6.70mm	74		15/16	78
8-36	29	70		57/64	64		17/64	71	30x3.5	26.50mm	74
	9/64	60	1-12	29/32	82	8.0x1.0	7.00mm	69		1-3/64	73
10-24	3.70mm	76		59/64	68		J	66	33x3.5	29.50mm	74
	25	69	1-14	59/64	79					1-11/64	72
10-32	5/32	75		15/16	62
	21	68	1-1/8-7	63/64	73				PIPE TAP DRILL SIZES
12-24	11/64	75		1	65
	17	73	1-1/8-12	1-1/32	82
12-28	16	77		1-3/64	67			TAP SIZE	NPT TAP DRILL	NPS TAP DRILL
	15	70	1-1/4-7	1-3/32	81
1/4-20	9	77		1/7-64	73			1/16-27	D	1/4
	7	70		1-1/8	64			1/8-27	Q	11/32
	13/64	66	1-1/4-12	1-5/32	81			1/4-18	7/16	7/16
1/4-28	3	70		1-11/64	67			3/8-18	9/16	37/64
	5.50mm	67	1-3/8-6	1-13/64	81			1/2-14	45/64	23/32
5/16-18	F	72		1-19/64	66			3/4-14	29/32	59/64
	G	66	1-3/8-12	1-9/32	81			1-11-1/2	1-9/64	1-5/32
5/16-24	6.80mm	78		1-19/64	66			1-1/4-11-1/2	1-31/64	1-1/2
	I	70	1-1/2-6	1-11/32	69			1-1/2-11-1/2	1-47/64	1-3/4
3/8-16	5/16	74		1-23/64	62			2-11-1/2	2-13/64	2-7/32
	O	69	1-1/2-12	1-13/32	80			2-1/2-8	2-5/8	2-21/32
				1-27/64	66