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Whitworth & British

BSB British Standard Brass

Constant 26 TPI Whitworth-form thread for thin brass tubing and fittings.

Standard
BS 84
Flank angle
55°
Sizes listed
11
Range
BSB 1/8" – BSB 1 1/2"
Profile shape (schematic, not to scale)

Nominal DiameterDiameter InchDiameter mmTapping Drill Size mmTPIPitch mm
BSB 1/8"0.1253.1751.923260.977
BSB 1/4"0.2505.5565.098260.977
BSB 3/8"0.3759.5258.273260.977
BSB 1/2"0.50012.70011.448260.977
BSB 5/8"0.62515.87514.369260.977
BSB 3/4"0.75019.05017.798260.977
BSB 7/8"0.87522.22520.973260.977
BSB 1"1.00025.40024.148260.977
BSB 1 1/8"1.50028.57527.323260.977
BSB 1 1/4"1.25031.75030.498260.977
BSB 1 1/2"1.50038.10036.848260.977
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Related Standards

BSW British Standard Whitworth BS 84 32 rows · W 1/16" – W 4" BSF British Standard Fine BS 84 30 rows · BSF 3/16" – BSF 4 1/4" BA British Association Thread BS 93 26 rows · BA No. 0 – BA No. 25 ME Model Engineer Thread 16 rows · ME 1/8" – ME 1/2" Whitworth Fine Thread 1 DIN 239 91 rows · W 56 x 1/4" – W 499 x 1/4" Whitworth Fine Thread 2 DIN 240 41 rows · W 20 x 1/10" – W 189 x 1/6"

Reference values only. Verify against the current edition of the governing standard before use in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.