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Alloy Steel Precision Pin for Machinery with Zinc Plating. Long-Term Durability: Carbon steel base with zinc/chrome plating extends service life by over 3 times compared to standard pins. Multi-Scenario Application: Suitable for machinery, automotive, electronics, and automated equipment assembly needs. Noise Reduction: Cylindrical body and flat notch design reduce equipment vibration noise by 5-8dB in electronic scenarios.