Free Cutting Steels are steels produced by adding elements such as Sulfur or Lead to improve machinability.
Qualities:11SMnPb30 - (9SMnPb28) (SAE 12L13), 11SMnPb37 - (9SMnPb36) (SAE 12L14), 11SMn30 - (9SMn28) (SAE 1213), 11SMn37 - (9SMn36) (SAE1215)