American standard:
Materials : ANSI/ASME A197-79
Dimensions: ANSI / ASME B16.3-85
Threads: ANSI / ASME B1.20.1
Din Standard :
Materials: DIN1692
Dimensions: EN10242 DIN2950
Threads: ISO 7/1 DIN2999
British Standard:
Materials : ISO5922 BS143 AND BS1256
Dimensions : ISO49
Threads: ISO 7/1