BA THREAD SIZES
BA THREAD SIZES | |||||
Numbers | Diameter of Screw over thread | Head Across Flats | Threads per inch | Pitch | Tapping Drill Size |
0 BA | 0.2360 inch | 0.413 inch | 25.4 tpi | 0.0394 inch | 5.1 mm |
1 BA | 0.2090 inch | 0.366 inch | 28.2 tpi | 0.0354 inch | 4.5 mm |
2 BA | 0.1850 inch | 0.324 inch | 31.4 tpi | 0.0319 inch | 4 mm |
3 BA | 0.1610 inch | 0.282 inch | 34.8 tpi | 0.0287 inch | 3.4 mm |
4 BA | 0.1420 inch | 0.249 inch | 38.5 tpi | 0.0260 inch | 3 mm |
5 BA | 0.126 inch | 0.221 inch | 43 tpi | 0.0232 inch | 2.65 mm |
6 BA | 0.11 inch | 0.193 inch | 47.9 tpi | 0.0209 inch | 2.3 mm |
7 BA | 0.0982 inch | 0.172 inch | 52.9 tpi | 0.0189 inch | 2.05 mm |
8 BA | 0.086 inch | 0.151 inch | 59.1 tpi | 0.0169 inch | 1.8 mm |
9 BA | 0.075 inch | 0.131 inch | 65.1 tpi | 0.0154 inch | 1.55 mm |
10 BA | 0.067 inch | 0.117 inch | 72.6 tpi | 0.0138 inch | 1.4 mm |
11 BA | 0.059 inch | 0.103 inch | 81.9 tpi | 0.0122 inch | 1.2 mm |
12 BA | 0.051 inch | 0.089 inch | 90.9 tpi | 0.011 inch | 1.05 mm |
13 BA | 0.047 inch | 0.082 inch | 102 tpi | 0.0098 inch | 0.98 mm |
14 BA | 0.039 inch | 0.068 inch | 109.9 tpi | 0.0091 inch | 0.8 mm |
15 BA | 0.035 inch | 0.061 inch | 120.5 tpi | 0.0083 inch | 0.7 mm |
16 BA | 0.0310 inch | 0.054 inch | 133.3 tpi | 0.0075 inch | 0.6 mm |