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BS 21:1985 Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions)
standard by BSI Group, 09/30/1985
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Full Description
Range of threads from 1/16 to 6, together with thread forms, dimensions and tolerances, designations; includes appendices for recommended gauging systems and methods of use of gauges. Requirements for jointing threads for taper external threads, for assembly with either tapes or parallel internal threads and for longscrew threads for longscrews specified in BS 1387.Cross References:
BS 919:Part 2
BS 1387
BS 2779
Partially replaced by BS EN 10226-1:2004.
Incorporates the following:
AMD 6633 published 21 December 1990