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Excavator Slewing Bearing Komatsu 20m-25-81201 Excavator PC15. Professional Measurement: Engineers visit workplaces to measure old rings for precise replacement production. Advanced Manufacturing: Equipped with latest CNC machines for vertical lathes, grinding, and quenching. ISO 9001 Certified: Manufacturing process adheres to ISO 9001:2000 certification standards. Durable Material: Constructed from 50mn/42CrMo material with hardness of 229-269. Fast Delivery: Average lead time within 15 workdays off-season; peak season one month. 18-Month Warranty: Comprehensive 18-month warranty coverage for product quality assurance. Rich Experience: Over 10 years of manufacturing experience and 20 years of engineering expertise.