Malleable iron pipe fittings
The sizes are from 1/8" to 6", widely uesed in various pipelines to convery gas, water, oil and so on. .

American standard:
Material: ASTM A - 197,
Dimensions: ASME B16.3, B16.14, B16.39
Threads: ANSI B1.20.1

British standard
Material: ASTM A - 197
Dimensions: BS EN 10242, BS 143&1256
Threads: ISO7/1

Din standard
Material: ASTM A - 197
Dimensions: ISO49, DIN 2950
Threads: DIN 2999.