AISI 440C: High carbon martensitic stainless steel commonly used in load carrying components in ball bearings and roller bearings. With a high carbon and chromium content, AISI 440C offers good fatigue life, high strength, and resistance to cracking and burring. It has a typical surface hardness ranging from 58-62 on the Rockwell C scale, which is similar to SAE 52100. In addition, AISI 440C has good corrosion resistance compared to other bearing materials, making it suitable for applications in harsh environments. However, like SAE 52100, the surfaces of AISI 440C bearings must be protected with a coating of rust inhibitor or oil to prevent oxidation. Some common applications of AISI 440C include surgical instruments, aerospace components, and high-performance bearings for industrial equipment, motorsports, and marine applications.

Strengths: excellent corrosion resistance, high hardness, good toughness, and good dimensional stability.
Weaknesses: poor machinability and lower impact resistance than other stainless steels.
Applications: knife blades, surgical instruments, bearings, and other applications where high corrosion resistance and good edge retention are important.

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