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Section A British Threads of Whitworth Form
Glossary English French and German
29-deg Stub American Acme AMERICAN THREADS angle 20 basic dimensions Basic Form Dimensions Basic Major Diameter Basic Sizes Black Bolts BOTTLE CLOSURE THREADS British Standard Whitworth Class 2A classes of fit clearance cosec crest and root Depth of engagement Depth of thread Diameter of Nut diameter of screw Dimensions in Inches Dryseal Edison Screw Effective Diameter Flank angle formula gas pressure regulators Gauge Length given in Table height H helix angle Horological inch Major Diam Inches Threads internal thread Maximum Metal Dimensions Metric Thread nominal diameter Radius at root screw axis screw threads Screws and Nuts SERIES Basic Shortening at crest shown in Fig specified by B-S tan2 Taper Pipe Thread Taper Threads Tapping Drill Sizes Thread angle 26 thread form thread h Thread—Basic Threads per inch Tolerances and Allowances Triangular height truncation U.N.C. UNIFIED UNIFIED AND AMERICAN Whitworth form Width across Flats Wmax