Black Mild Steel Fittings
Black Mild Steel Fittings Screwed BSP to BS.EN.10241
Often referred to as Wrought Iron Fittings, Mild Steel Fittings
are rated similar to Malleable Fittings but will withstand abrasive
media and more often used for Steam applcations.
To see a Metric/BSP equivalence table click this Link Metric BSP Table