2013BS EN ISO 1179-1:2013 Connections for general use and fluid power. Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing. Threaded ports
2009BS EN ISO 1179-1:2008 Connections for general use and fluid power - Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing - Threaded ports
1984BS 5380:1984 Specification for hydraulic port and stud coupling using 'O'-ring sealing and 'G' series fastening threads