Specifications of International Thread Standards

The British Model Engineer Thread is based on the Whitworth thread with a pitch of 32 and 40 TPI. A commercial use of this standard does not exist.
The flank angle is 55°.

Thread SizeDiameter
Inch
Diameter
mm
Tapping Drill Size
mm
TPIPitch
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
ME Thread