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Whitworth & British

Whitworth Fine Thread, Special

British threads based on Whitworth's 55° profile with rounded crests and roots, still found on older machinery, pipe fittings and model engineering.

Standard
DIN 30284 / DIN LON 293
Flank angle
55°
Sizes listed
5
Range
W 14 x 1/12" DIN 30284 – W 18 x 1/11" DIN 30284
Profile shape (schematic, not to scale)

Thread SizeTapping Drill Size mmCore Area cm²TPIPitch mm
W 14 x 1/12" DIN 3028411.2901.00122.117
W 15 x 1/12" DIN 3028412.2901.18122.117
W 17 x 1/11" DIN 3028414.0421.54112.309
W 18 x 1/11" DIN 3028415.0421.77112.309
Thread SizeTapping Drill Size mmCore Area cm²Pitch mm
Sg 56 x 3.75 LON 29352.5021.643.75
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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 BSB British Standard Brass BS 84 11 rows · BSB 1/8" – BSB 1 1/2" 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"

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.