Specifications :
Standard : ISO 13337, ISO 8752, ISO 8750, ISO 8748, ISO 8751
Material : Hardened spring steel
Surface Treatment : Thermally blackened, zinc passivation
Standard : ISO 13337, DIN 7346
Sizes : As per the attached PDF file
Material : Spring steel, EN 42J, CK 70-80, SAE 1070-1080
Hardness : Heat treated to 420-520 HV
Surface Treatment : Thermally blackened, zinc passivation, Phosphated