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Whitworth & British

Whitworth Fine Thread, 10 TPI

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 LON 286
Flank angle
55°
Sizes listed
22
Range
W 20 x 1/10" LON – W 80 x 1/10" LON
Profile shape (schematic, not to scale)

Thread SizeTapping Drill Size mmCore Area cm²TPIPitch mm
W 20 x 1/10" LON16.7462.20102.54
W 23 x 1/10" LON19.7463.06102.54
W 26 x 1/10" LON22.7464.06102.54
W 30 x 1/10" LON26.7465.62102.54
W 33 x 1/10" LON29.7466.95102.54
W 34 x 1/10" LON30.7467.42102.54
W 36 x 1/10" LON32.7468.42102.54
W 37 x 1/10" LON33.7468.94102.54
W 40 x 1/10" LON36.74610.60102.54
W 42 x 1/10" LON38.74611.78102.54
W 43 x 1/10" LON39.74612.41102.54
W 46 x 1/10" LON42.74614.35102.54
W 50 x 1/10" LON46.74617.16102.54
W 53 x 1/10" LON49.74619.44102.54
W 56 x 1/10" LON52.74621.85102.54
W 60 x 1/10" LON56.74625.29102.54
W 63 x 1/10" LON59.74628.04102.54
W 66 x 1/10" LON62.74630.92102.54
W 70 x 1/10" LON66.74634.99102.54
W 73 x 1/10" LON69.74638.21102.54
W 76 x 1/10" LON72.74641.56102.54
W 80 x 1/10" LON76.74646.26102.54
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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.