BS 4084:1978

Determines the basic triangular profile for inch series UNJ threads with controlled root radius. Gives a system of designating and also, for diameters from 0.060 in to 6 in, 3 series of diameter/pitch combinations and basic dimensions and tolerances. Also specifies the gauge procedures to be used. National appendix adds 20 UNJ constant pitch series for diameters up to and including 3 inches.