Material improved over STS 440C
Hardening Depth more than 0.5mm
High-frequency induction hardening
Surface roughness less than 1.5s
Hardness more than HRC 5760
Tolerance or shaft diameter g6

As the SNK stainless shafts are highly anti-corrosive, they are most appropriate for use in the easily axidizing enviromments such as water, chemicals, vapor and sea water.