High Carbon Steel Balls (through hardened) Balls of this material have the advantage of being through hardened and will take higher loads and provide longer life than case hardened balls, for such applications as the cycle industry. These balls are substantially cheaper than balls manufactured from high carbon chrome alloy steels. Hardness: HRC58-64 Size Available: 0.5~ 30mm Grade Available: G20~G1000 Application: Take high load and provide longer life than case hardened carbon balls, applications is the cycle industry, food industry, etc.