1. BA, Brass & Model Engineer Threads
  2. British Std Brass

British Std Brass

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Total record count: 11.

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BSB has a 26 TPI pitch through the whole range and is often confused with BS Cycle thread the difference being that brass thread has an angle of 55 degrees whereas Cycle is 60 degrees. Brass threads are usually confined to fittings and adjusters on cables. Brass thread taps and dies are sold and advertised as 26 tpi and are identified by the letters BSB.
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Size Outside Dia Inch Tpi Pitch Inch Core Dia Inch Radius Inch Thread Depth Thou Tapping Drill Size Inch Tapping Drill Size Mm Letter Or Number
1/8 0.13 26 0.04 0.08 0.01 25 0.08 2.0 47
1/4 0.25 26 0.04 0.20 0.01 25 0.20 5.2 6
3/8 0.38 26 0.04 0.33 0.01 25 0.33 8.5 Q
1/2 0.50 26 0.04 0.45 0.01 25 0.45 11.5 29/64
5/8 0.63 26 0.04 0.57 0.01 25 0.58 14.7 37/64
3/4 0.75 26 0.04 0.70 0.01 25 0.70 17.9 45/64
7/8 0.88 26 0.04 0.83 0.01 25 0.83 21.0 53/64
1 1.00 26 0.04 0.95 0.01 25 0.95 24.2 61/64
1 - 1/8 1.13 26 0.04 1.08 0.01 25 1.08 27.4 1 - 5/64
1 - 1/4 1.25 26 0.04 1.20 0.01 25 1.20 30.6 1 - 13/64
1 - 1/2 1.50 26 0.04 1.45 0.01 25 1.45 36.8 1 - 29/64

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