BS 1104:1957

Defines Acme thread; tables of basic sizes, limits and tolerances for standard series of single start threads 3/16 in to 5 in diameter. Agrees with ASA B1.5:1952 except for pitches associated with diameters 3/8 in, 7/16 in, 1 in, 1 3/16 in and 1½ in. 2G, 3G and 4G fits in the American standard included, together with finer class, 5G. Tables of effective diameter tolerances for extended range of diameter/pitch combinations are provided. From these and related tables limiting dimensions for any special diameter/pitch combination for single or multi-start Acme thread can be calculated.Cross References:BS 350BS 2517