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British Association Standard Thread. Used for instruments and clocks. Replaced by the metric ISO thread and the ISO fine thread. The flank angle is 47.5°. Advertising: BA Thread No. | Diameter mm | Tapping Drill Size mm | Pitch mm | BA No. 0 | 6.00 | 4.80 | 1.00 | BA No. 1 | 5.30 | 4.22 | 0.90 | BA No. 2 | 4.70 | 3.73 | 0.81 | BA No. 3 | 4.10 | 3.22 | 0.73 | BA No. 4 | 3.60 | 2.81 | 0.66 | BA No. 5 | 3.20 | 2.49 | 0.59 | BA No. 6 | 2.80 | 2.16 | 0.53 | BA No. 7 | 2.50 | 1.92 | 0.48 | BA No. 8 | 2.20 | 1.68 | 0.43 | BA No. 9 | 1.90 | 1.43 | 0.39 | BA No. 10 | 1.70 | 1.28 | 0.35 | BA No. 11 | 1.50 | 1.13 | 0.31 | BA No. 12 | 1.30 | 0.96 | 0.28 | BA No. 13 | 1.20 | 0.90 | 0.25 | BA No. 14 | 1.00 | 0.72 | 0.23 | BA No. 15 | 0.90 | 0.65 | 0.21 | BA No. 16 | 0.79 | 0.65 | 0.19 | BA No. 17 | 0.70 | 0.50 | 0.17 | BA No. 18 | 0.62 | 0.44 | 0.15 | BA No. 19 | 0.54 | 0.37 | 0.14 | BA No. 20 | 0.48 | 0.34 | 0.12 | BA No. 21 | 0.42 | 0.29 | 0.11 | BA No. 22 | 0.37 | 0.25 | 0.098 | BA No. 23 | 0.33 | 0.22 | 0.090 | BA No. 24 | 0.29 | 0.19 | 0.080 | BA No. 25 | 0.25 | 0.16 | 0.072 |  |
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