Stressproof^® is a medium carbon free machining steel that has been severely cold reduced to improve its mechanical properties. Its inherent strength, without heat treatment, is comparable to heat treated steels of equal hardness. This permits direct use of many parts following the last machining operation, without the necessity of a further hardening treatment.

Machinability is rated at 83% of B1112, 50 to 100% faster than carbon or alloy steels of equivalent hardness.

Turned and polished.