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BS21 Standard Specification for Pipe threads for tubes and fittings wher pressure-tight joints are made on the threads(metric dimensions).This British Standard specifies requirements for the following pipe threads.
(A) Jointing threads
(B) Longscrew threads
Thread sizes from 1/16 to 6 inclusive are coverd by this standard and requirements for thread forms,dimensions and tolerances are given,together with the designation of each type of thread.