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3mm to 8mm Brass Motor Shaft Hex Joint Coupling for RC Car Truck Train Boat. High Torque Capacity: Torque exceeds 80N.M for reliable power transmission. Wide Bore Range: Compatible with shafts from 3mm to 8mm diameter. High Speed Performance: Rated for speeds up to 8000r/M. Diverse Material Options: Available in Brass, Aluminum, Stainless Steel, and Titanium. ISO 9001:2018 Certified: Manufacturing processes strictly adhere to international quality standards. Full Customization Support: OEM and ODM services available with flexible customization options. 100% Quality Inspection: Comprehensive testing from incoming materials to final shipment. Advanced CNC Machining: Utilizes precision CNC turning, milling, and laser cutting technologies.