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🇯🇵 Japan equivalent of

51CrV41.8159

SUP1090%

Standard: JIS · Source: JIS G4801

Japanese spring steel

Other international equivalents

CountryStandardGradeMatch
🇺🇸USAAISIAISI 6150REF
🇪🇺EuropeEN51CrV4100%
🇪🇺EuropeDIN50CrV4 (old)99%
🇨🇳ChinaGB50CrVA93%