Production process of Malleable iron pipe fittings,

The surface of malleable iron pipe fittings can be different. Normally, it can divide to black, baked galvanize and hot dipped galvanize.Black: as per the meaning of the word, factory don't do any further procedures for surface, in case of rusting, factory will fill with anti-rusting oil for protect

The max size of malleable iron pipe fitting is up to 6".It is threaded fittings, the threading machine cannot process upper than 6", also larger size cannot be operated by labor.Normally, malleable iron pipe fittings size range is 1/4" to 6", popular size is from 1/2" to 2".