BA size chart

Screw Numbers	Diameter of Screw Over Thread	Threads per inch	Pitch	Diameter at Thread Bottom	Tapping Drill Size	BUY Taps and Dies
16 BA	0.0310 inch	133.3 tpi	0.0075 inch	0.0220 inch	Number drill 73 0.6 mm 0.0236 inch	N/A
15 BA	0.035 inch	120.5 tpi	0.0083 inch	0.025 inch	Number drill 70 0.7 mm 0.0276 inch	N/A
14 BA	0.039 inch	109.9 tpi	0.0091inch	0.028 inch	0.8 mm 0.0315 inch	N/A
12 BA	0.051 inch	90.9 tpi	0.011 inch	0.0378 inch	Number drill 60 1.05 mm 0.0413 inch	N/A
11 BA	0.059 inch	81.9 tpi	0.0122 inch	0.0443 inch	Number drill 56 1.2 mm 0.0472 inch	N/A
10 BA	0.067 inch	72.6 tpi	0.0138 inch	0.0504 inch	Number drill 54 1.4 mm 0.0551 inch	Taps and Dies
9 BA	0.075 inch	65.1 tpi	0.0154 inch	0.0565 inch	1.55 mm 0.061 inch	Taps and Dies
8 BA	0.086 inch	59.1 tpi	0.0169 inch	0.0657 inch	Number drill 50 1.8 mm 0.0709 inch	Taps and Dies
7 BA	0.0982 inch	52.9 tpi	0.0189 inch	0.0753 inch	Number drill 46 2.05 mm 0.0807 inch	Taps and Dies
6 BA	0.11 inch	47.9 tpi	0.0209 inch	0.0849 inch	2.3 mm 0.0906 inch	Taps and Dies
5 BA	0.126 inch	43 tpi	0.0232 inch	0.0981 inch	Number drill 37 2.65 mm 0.1043 inch	Taps and Dies
4 BA	0.1420 inch	38.5 tpi	0.0260 inch	0.1108 inch	Number drill 31 3 mm 0.1181 inch	Taps and Dies
3 BA	0.1610 inch	34.8 tpi	0.0287 inch	0.1266 inch	Number drill 29 3.4 mm 0.1339 inch	Taps and Dies
2 BA	0.1850 inch	31.4 tpi	0.0319 inch	0.1467 inch	Number drill 22 4 mm 0.1575 inch	Taps and Dies
1 BA	0.2090 inch	28.2 tpi	0.0354 inch	0.1665 inch	Number drill 16 4.5 mm 0.1772 inch	Taps and Dies
0 BA	0.2360 inch	25.4 tpi	0.0394 inch	0.1887 inch	Number drill 9 5.1 mm 0.2008 inch	Taps and Dies