BA sizes	Maj.dia.	Pitch mm	ISO Metric sizes		US Screw	No. or Dia."	Major Dia."	tpi	Maj.dia.mm	Pitch mm	Tapping drill
			Dia mm	Pitch mm							Dia mm
					0.25-32		0.25	32	6.35	0.79	5.56
0	6.00	1.00	6	1	0.25-28		0.25	28	6.35	0.91	5.41
					0.25-20	1/4	0.25	20	6.35	1.27	5.11
			5	0.8	12-32		0.216	32	5.49	0.79	4.70
1	5.30	0.90			12-28		0.216	28	5.49	0.91	4.62
					12-24	12	0.216	24	5.49	1.06	4.50
2	4.70	0.81	4.5	0.75	10-32		0.19	32	4.83	0.79	4.04
					10-24	10	0.19	24	4.83	1.06	3.80
3	4.10	0.73	4	0.7	8-36		0.164	36	4.17	0.71	3.45
					8-32	8	0.164	32	4.17	0.79	3.45
4	3.60	0.66	3.5	0.6	6-40		0.138	40	3.51	0.64	2.87
					6-32	6	0.138	32	3.51	0.79	2.71
5	3.20	0.59	3	0.5	5-44		0.125	44	3.18	0.58	2.64
					5-40	5	0.125	40	3.18	0.64	2.58
6	2.80	0.53			4-48		0.112	48	2.84	0.53	2.37
					4-40	4	0.112	40	2.84	0.64	2.26
7	2.50	0.48	2.5	0.45	3-56		0.099	56	2.51	0.45	2.08
					3-48	3	0.099	48	2.51	0.53	1.99
			2	0.4	2-64		0.086	64	2.18	0.40	1.78
8	2.20	0.43	2.2	0.45	2-56	2	0.086	56	2.18	0.45	1.78
9	1.90	0.39			1-64	1	0.073	64	1.85