Tap Size	Drill Size	Probable % Thread	Tap Size	Drill Size	Probable % Thread	Tap Size	Drill Size	Probable % Thread
0-80	3/64	71  - 81	10-24	25	69  - 75	9/16-18	33/64	58  - 65
M1.6 X 0.35	1.25mm	69 - 77	10-32	21	68  - 76	5/8-11	17/32	75  - 79
1-64	53	59  - 67	M5.0 X 0.8	4.2mm	69 - 77	5/8-18	37/64	58  - 65
M2.0 X 0.4	1/16	72 - 79	12-24	17	73  - 79	M16 X 2	35/64	76 - 81
1-72	53	67  - 75	12-28	15	70  - 78	3/4-10	21/32	68  - 72
2-56	51	74  - 82	M8.0 X 1.25	10	76 - 84	3/4-16	11/16	71  - 77
2-64	50	70  - 79	1/4-20	7	70  - 75	M20 X 2.5	11/19	74 - 78
M2.5 X 0.45	2.05mm	69 - 77	1/4-28	3	72  - 80	7/8-9	49/64	72  - 76
3-48	5/64	70  - 77	5/16-18	F	72  - 77	7/8-14	13/16	62  - 67
3-56	46	69  - 78	5/16-24	I	67  - 75	M24 X 3	53/64	72  - 76
4-40	44	74  - 80	M8.0 X 1	6.7mm	74 - 80	1-8	7/8	73  - 77
4-48	42	61  - 68	3/8-16	5/16	72  - 77	1 1/8-7	63/64	72  - 76
M3.0 X 0.5	40	70 - 79	3/8-24	Q	71  - 79	1 1/8-12	1 3/64	66  - 72
5-40	39	71  - 79	M10 X 1.5	8.4mm	76 - 82	M30 X 3.5	1 3/64	75
5-44	38	72  - 79	7/16-14	U	70  - 75	1 1/4-7	1 7/64	76
M3.5 X 0.6	33	72 - 81	7/16-20	25/64	65  - 72	1 1/4-12	1 11/64	72
6-32	36	72  - 78	M12 X 1.75	13/32	69 - 74	1 3/8-6	1 7/32	72
6-40	33	69  - 77	1/2-13	27/64	73  - 78	1 3/8-12	1 19/64	72
M4.0 X 0.7	3.25mm	74 - 82	1/2-20	29/64	65  - 72	M36 X 4	1 19/64	82
8-32	29	62  - 69	M14 X 2	15/32	76 - 81	1 1/2-6	1 11/32	72
8-36	29	70  - 78	9/16-12	31/64	68  - 72	1 1/2-12	1 27/64	72