[国外标准] BS EN 10226-3-2005 Pipe threads where pressure-tight joints are made on the threads — Part 3 Verific
[国外标准] BS EN 10226-2-2005 Pipe threads where pressure tight joints are made on the threads. Taper external
[国外标准] BS EN 10226-1-2004 Pipe threads where pressure tight joints are made on the threads. Taper external