American standard:

1) Materials: ANSI/ASME A197-79

2) Dimensions: ANSI/ASME B 16.3-85

3) Threads: ANSI/ASME B1.20.1



DIN standard: 

1) Materials: DIN1692

2) Dimensions: DIN2950

3) Threads: DIN2999



British standard:

1) Materials: ISO5922

2) Dimensions: ISO49

3) Threads: ISO 7/1

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

4) Available in galvanised, black, banded, beaded and plain