BS EN 10242, officially titled "Fittings made of malleable cast iron for threaded pipe joints," is the governing standard in the United Kingdom and across Europe for these components. It supersedes the long-standing British Standard BS 143, harmonizing requirements with European norms. This paper outlines the technical specifications of BS EN 10242 and its implications for engineering design and safety.
The current version of this standard is (which incorporated later amendments), though it is gradually being superseded by the updated BS EN 10242:2025 . It replaced earlier UK standards like BS 143 and BS 1256, although parts of those remain valid for specific copper alloy fittings not covered by EN 10242. Bs En 10242 Pdf