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BSB British Standard Brass Thread. Used brass tubing. BSB has a 26 TPI pitch through the whole range. The flank angle is 55°. Advertising: Nominal Diameter | Diameter Inch | Diameter mm | Tapping Drill Size mm | TPI | Pitch mm | BSB 1/8" | 0.125 | 3.175 | 1.923 | 26 | 0.977 | BSB 1/4" | 0.250 | 5.556 | 5.098 | 26 | 0.977 | BSB 3/8" | 0.375 | 9.525 | 8.273 | 26 | 0.977 | BSB 1/2" | 0.500 | 12.700 | 11.448 | 26 | 0.977 | BSB 5/8" | 0.625 | 15.875 | 14.369 | 26 | 0.977 | BSB 3/4" | 0.750 | 19.050 | 17.798 | 26 | 0.977 | BSB 7/8" | 0.875 | 22.225 | 20.973 | 26 | 0.977 | BSB 1" | 1.000 | 25.400 | 24.148 | 26 | 0.977 | BSB 1 1/8" | 1.500 | 28.575 | 27.323 | 26 | 0.977 | BSB 1 1/4" | 1.250 | 31.750 | 30.498 | 26 | 0.977 | BSB 1 1/2" | 1.500 | 38.100 | 36.848 | 26 | 0.977 |  |
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