Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1:2000); German version EN ISO 228-1:2003— 11 стр.
Geometrical Product Specifications (GPS) - Indication of surface texture in technical product documentation (ISO 1302:2002); German version EN ISO 1302:2002— 51 стр.