BA

BA Screws and Threads

BA	Thread pitch	Outside diameter	Threads density	Outside diameter	Spanner		Tapping Drill Size
	(mm)	(mm)	threads per inch(tpi)	(in)	(mm)	(in)	(mm)
0	1.00	6.00	25.40	0.2362	10.5000	0.4134	5.1
1	0.90	5.30	28.22	0.2087	9.2750	0.3652	4.5
2	0.81	4.70	31.36	0.1850	8.2250	0.3238	4
3	0.73	4.10	34.79	0.1614	7.1750	0.2825	3.4
4	0.66	3.60	38.48	0.1417	6.3000	0.2480	3
5	0.59	3.20	43.05	0.1260	5.6000	0.2205	2.65
6	0.53	2.80	47.92	0.1102	4.9000	0.1929	2.3
7	0.48	2.50	52.92	0.0984	4.3750	0.1722	2.05
8	0.43	2.20	59.07	0.0866	3.8500	0.1516	1.8
9	0.39	1.90	65.13	0.0748	3.3250	0.1309	1.55
10	0.35	1.70	72.57	0.0669	2.9750	0.1171	1.4
⋮
25	0.072	0.25	352.78	0.0098	0.4375	0.0172	.