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Excavator Slewing Bearing Slewng Ring 21K-25-00101 PC160-7. Custom Measurement: Engineers visit sites to measure old rings for precise replacement production. Fast Delivery: Short delivery time with some models in stock and 15-day lead time for others. Quality Assurance: 18-month warranty and 10 years of professional manufacturing experience. Advanced Manufacturing: Equipped with latest CNC machines for vertical lathes and gear processing. Flexible MOQ: No minimum order quantity requirements; any quantity is acceptable. Global Shipping: Easy transport from Shanghai/Qingdao ports via sea, air, rail, or express. Durable Material: Made of alloy steel with hardness 229-269 and Q+T heat treatment.