BA-Thread-Table7:16 p.m.
British Association Thread Chart
Thread Angle 47.5 Degrees
B.A. Size | Mertic Dia | Inch Dia | T.P.I. | Metric T/mm | Pitch | Core Dia | Thread Depth | Crest Radius | Hex A/Flats | Hex A/Flats | Tapping Size " | Tapping mm | Number Drill |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 | 5.999 | 0.2362 | 25.4 | 1.00 | 0.0394 | 0.1887 | 0.0236 | 0.0071 | 0.413 | 10.5 | 0.2008 | 5.1 | 9 |
1 | 5.301 | 0.2087 | 28.2 | 1.11 | 0.0354 | 0.1665 | 0.0213 | 0.0064 | 0.365 | 9.3 | 0.1772 | 4.5 | 16 |
2 | 4.699 | 0.185 | 31.4 | 1.24 | 0.0319 | 0.1467 | 0.0191 | 0.0057 | 0.324 | 8.2 | 0.1575 | 4 | 22 |
3 | 4.100 | 0.1614 | 34.8 | 1.37 | 0.0287 | 0.1266 | 0.0173 | 0.0052 | 0.282 | 7.2 | 0.1339 | 3.4 | 29 |
4 | 3.599 | 0.1417 | 38.5 | 1.52 | 0.026 | 0.1108 | 0.0156 | 0.0047 | 0.248 | 6.3 | 0.1181 | 3 | 31 |
5 | 3.200 | 0.126 | 43 | 1.69 | 0.0232 | 0.0981 | 0.014 | 0.0042 | 0.22 | 5.6 | 0.1043 | 2.65 | 37 |
6 | 2.799 | 0.1102 | 47.9 | 1.89 | 0.0209 | 0.0849 | 0.0126 | 0.0038 | 0.193 | 4.9 | 0.0906 | 2.3 | 42 |
7 | 2.499 | 0.0984 | 52.9 | 2.08 | 0.0189 | 0.0753 | 0.0114 | 0.0034 | 0.172 | 4.4 | 0.0807 | 2.05 | 46 |
8 | 2.200 | 0.0866 | 59.1 | 2.33 | 0.0169 | 0.0657 | 0.0102 | 0.0031 | 0.152 | 3.9 | 0.0709 | 1.8 | 50 |
9 | 1.900 | 0.0748 | 65.1 | 2.56 | 0.0154 | 0.0565 | 0.0093 | 0.0028 | 0.131 | 3.3 | 0.061 | 1.55 | NA |
10 | 1.699 | 0.0669 | 72.6 | 2.86 | 0.0138 | 0.0504 | 0.0083 | 0.0025 | 0.117 | 3.0 | 0.0551 | 1.4 | 54 |
11 | 1.499 | 0.059 | 82 | 3.23 | 0.0122 | 0.0443 | 0.0073 | 0.0022 | 0.0 | 0.0472 | 1.2 | 56 | |
12 | 1.298 | 0.0511 | 90.7 | 3.57 | 0.011 | 0.0378 | 0.0067 | 0.002 | 0.0 | 0.0413 | 1.05 | 60 | |
13 | 1.199 | 0.0472 | 102 | 4.02 | 0.0098 | 0.0352 | 0.0059 | 0.0018 | 0.0 | 0.0386 | 0.98 | 62 | |
14 | 1.001 | 0.0394 | 110 | 4.33 | 0.0091 | 0.028 | 0.0055 | 0.0016 | 0.0 | 0.0315 | 0.8 | NA | |
15 | 0.899 | 0.0354 | 121 | 4.76 | 0.0083 | 0.025 | 0.0049 | 0.0015 | 0.0 | 0.0276 | 0.7 | 70 | |
16 | 0.790 | 0.0311 | 134 | 5.28 | 0.0075 | 0.022 | 0.0045 | 0.0014 | 0.0 | 0.0236 | 0.6 | 73 |
10/12/2013 Page 1 of 1 7:16 p.m.