Features:
1) American standard
a) Materials: ANSI/ASME A197-79
b) Dimensions:ANSI/ASME B16.3-85
c) Threads: ANSI/ASME B1.20.1

2) Din Standard
a) Materials: DIN1692
b) Dimensions:DIN2950
c) Threads: DIN2999

3) British Standard:
a) Materials: ISO 5922
b) Dimensions: ISO 49
c) Threads: ISO 7/1