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Air Valve Steel Ground Round Rod From Four Point Five mm Starting. Customizable Material Grade: Multiple alloy compositions available upon request beyond standard grades. Custom Heat Treatment: Available annealing, pre-hardening, or quenching and tempering to 28-32 HRC. Custom Length Options: Standard 3m/4m bars or cut-to-length to minimize material waste. High Tensile Strength: Excellent fatigue resistance and wear resistance for dynamic, high-cycle applications. Comprehensive Certification: Mill Test Certificate (MTC) 3.1 standard with optional chemical analysis reports. Versatile Application Scope: Ideal for automotive valvetrain, pneumatic tools, compressor valves, and hydraulic systems.