... Item: Malleable Iron Pipe Fittings(elbows, tees, sockets, bends, nipples, unions, crosses, flanges, plugs, backnuts, crosses over, round caps, etc. ) 2. Thread Standard: British standard, American standard & DIN ... Threads: ISO 7/1 DIN2999 British Standard: Materials: ISO 5922 BS 143 and BS1256 Dimensions: ISO 49, Threads: ISO 7/1 Malleable Iron Pipe Fittings