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Cycle Engineer Institution Thread, used in the British bicycle industry. Smetimes the name "BSC" or "BSCy" is used. This series replaced the Cycle Engineers Institute (CEI) thread. Though the two series are somewhat different. The flank angle is 60°. Major Diameter Inch | Major Diameter mm | Tapping Drill Size mm | TPI | Pitch mm | 0.056 | 1.422 | 0.965 | 62 | 0.409 | 0.064 | 1.626 | 1.190 | 62 | 0.409 | 0.072 | 1.829 | 1.393 | 62 | 0.409 | 0.080 | 2.032 | 1.596 | 62 | 0.409 | 0.092 | 2.337 | 1.854 | 56 | 0.453 | 0.104 | 2.642 | 2.642 | 44 | 0.577 | 0.125 | 3.175 | 2.499 | 40 | 0.635 | 0.154 | 3.912 | 3.236 | 40 | 0.635 | 0.175 | 4.445 | 3.600 | 32 | 0.794 | 0.187 | 4.762 | 3.917 | 32 | 0.794 | 0.250 | 6.350 | 5.309 | 26 | 0.977 | 0.266 | 6.756 | 5.715 | 26 | 0.977 | 0.281 | 7.137 | 6.096 | 26 | 0.977 | 0.312 | 7.937 | 6.896 | 26 | 0.977 | 0.375 | 9.525 | 8.484 | 26 | 0.977 | 0.562 | 14.287 | 12.287 | 20 | 1.270 | 1.000 | 25.400 | 24.359 | 26 | 0.977 | 1.290 | 32.766 | 31.639 | 24 | 1.058 | 1.370 | 34.797 | 33.670 | 24 | 1.058 | 1.437 | 36.512 | 35.385 | 24 | 1.058 | 1.500 | 38.100 | 36.973 | 24 | 1.058 |  |
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