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Polished Air Valve Steel Round Rod for Compressor and Pump Valve Plates. Customizable Dimensions: Diameter range 4.50mm-80.00mm with custom lengths available. Custom Heat Treatment: Hardness 28-32 HRC with annealing or pre-hardening options. High Wear Resistance: Ideal for high-cycle dynamic applications in automotive and pneumatic systems. Alloy Steel Composition: Available in multiple grades including 4140 and 4340 upon request. Tight Tolerance Control: Standard h6/h7 with h5 available for high-precision needs. Comprehensive Certification: Includes MTC 3.1 with optional chemical analysis reports. Versatile Application Scope: Suitable for automotive valves, compressors, and hydraulic systems.