440C stainless steel from Source21 is a high carbon martensitic stainless steel grade engineered for maximum hardness wear resistance and dimensional stability. Known as one of the hardest stainless steels available Type 440C can be heat treated to reach Rockwell C60 making it ideal for applications requiring extreme durability and long service life. It offers good corrosion resistance for a high hardness alloy while maintaining precision and stability under demanding conditions. Common uses include bearings surgical blades dies valve seats and high precision tools where performance and accuracy are critical. Source21 supplies 440C stainless steel in coil, strip, sheet, foil, and bar, all manufactured to meet ASTM A276 and AMS 5630 standards. Contact the Source21 team to place an order review available forms or receive expert guidance for high hardness stainless steel applications supported by reliable supply and responsive service.