steel JIS SKS3 Steel: O1 Equivalent — Oil-Hardening Cold-Work Tool Steel for Short-Run Dies
SKS3 (JIS G4404) is Japan's O1-equivalent oil-hardening tool steel — simpler heat treatment than SKD11 with better toughness. Full guide: 1.2510 equivalent, heat treatment, and when SKS3 outperforms SKD11 for cold-work tooling.