S5 is a tool steel with high toughness and is able to hardened to Rc 62. It has the highest impact toughness of the S type steels.
Specifications:
UNS T41905, AISI S5, ASTM A681, QQ-T-570, SAE J437, SAE J438, ASTM S5
Applications:AISI S
hand chisels, pneumatic tools, hammers, stamps, brake dies, shear blade, drift pins, slitters, collets