1/2" BSP 

Female x Female Black Steel Socket

Black steel is made by adding carbon to iron during the smelting process. 

This creates iron-carbon alloys that are harder than pure iron but more brittle than other types of steel. 

Black steel has a matte finish that does not rust or corrode as easily as regular carbon steel due to its higher carbon content levels.

 

A - 37.0mm

C - 27.0mm