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BS 93:1951
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BS 93:1951 Specification for British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A
standard by BSI Group, 05/25/1951
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Form of thread defined. Tables: basic sizes from 0 B.A. to 25 B.A. Dimensions and tolerances for a 'normal' series from 0 B.A. to 16 B.A.; and for a 'close' class from 0 B.A. to 10 B.A. Recommended gauging system, tables of inch equivalents, in appendices. Data on bases of B.A. sizes, allowances and tolerances.Cross References:
BS 919
BS 1044
BS 1580
BS 3643:Part 1
BS 3643:Part 2
Handbook No. 18