Curved spring washers

The rate is approximately linear between 10% and 80% of available deflection.
Standard finish for high carbon steel is plain finish. Stainless steel is supplied in plain finish. On special order, high carbon steel washers may be mechanically plated, a process which substantially reduces the possibility of hydrogen embrittlement.
Stainless steel (parts with suffix ’S’)
Commercial – Type 301 per ASTM-A666 (chemical only)
High carbon steel:
Commercial – 1074-1095 per ASTM-A684