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Whitworth & British

ME Model Engineer Thread

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

Flank angle
55°
Sizes listed
16
Range
ME 1/8" – ME 1/2"
Profile shape (schematic, not to scale)

Thread SizeDiameter InchDiameter mmTapping Drill Size mmTPIPitch mm
ME 1/8"1/83.1752.362400.635
ME 5/32"5/323.9693.155400.635
ME 3/16"3/164.7633.949400.635
ME 7/32"7/325.5564.743400.635
ME 1/4"1/46.3505.333320.794
ME 1/4"1/46.3505.537400.635
ME 9/32"9/327.1446.127320.794
ME 9/32"9/327.1446.330400.635
ME 5/16"5/167.9386.920320.794
ME 5/16"5/167.9387.124400.635
ME 3/8"3/89.5258.508320.794
ME 3/8"3/89.5258.712400.635
ME 7/16"7/1611.11310.096320.794
ME 7/16"7/1611.11310.300400.635
ME 1/2"1/212.70011.683320.794
ME 1/2"1/212.70011.887400.635
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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" 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.