hemos obtenido ISO 9001, ISO 14001, ISO 45001, CE, certificación de calificación crediticia de nivel AAA, etc.
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.
