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Precision Forging Adjustment Block for 20cr Semi-Trailer Air Suspension. OEM Customization Available: Supports custom weight and specifications for tailored automotive solutions. High Precision Forging: Forging tolerance of +/-0.5mm ensures unmatched durability and precision. ISO 9001 Certified: Manufactured under ISO 9001:2000 and ISO 9001:2008 quality standards. Durable Steel Material: Made from 20Cr steel with quenching heat treatment and sand blasting. Large Production Capacity: Monthly production capacity of 30,000 units to meet bulk demands. Specialized Application: Specifically engineered for optimal performance in semi-trailer air suspension.