AS ASME IFI BS DIN EN GB SAE ISO JIS KS NF YJT Others

[M] Metric [UN] UNC/UNF/UNEF/UNR/UNRC/UNRF/UNS/... [MJ/UNJ] MJ/UNJ threads [ST] Self-Tapping Cutting/Locking Thread [G] 55°Pipe Threads where Pressure-Tight Joints are not made on the threads