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BS EN 10241:2000
Steel threaded pipe fittings (British Standard)
This European standard specifies requirements for threaded fittings of nominal sizes from DN 6 to DN 150 inclusive, made out of welded or seamless steel tubes, forging and rolled bars. It is applicable to those threaded steel pipe fittings that are used in the transportation and distribution of liquid or gas.
British Standards Institution [bsi]