Historical
DIN EN 1254-1:1998
Copper and copper alloy plumbing fittings - Part 1: Fittings with ends for capillary soldering or capillary brazing to copper tubes
The document specifies the maximum permissible temperatures and pressures, materials, assembly dimensions and tolerances and test requirements for fittings of copper and copper alloys with or without plating. This part 1 specifies connection end dimensions of capillary soldering and brazing ends for the purposes of joining copper tubes specified in EN 1057.
Deutsches Institut für Normung [din]