50Mn Steel Single Flange Bottom Track Roller with HRC 40-55 Hardness for Kobelco Excavators

The YT brand single flange track bottom roller is engineered as a direct replacement for Kobelco SK200 and SK350 series hydraulic excavators. Kobelco machines are renowned for their fuel efficiency and precision hydraulics, and our YT undercarriage components are manufactured to complement these performance characteristics. Each roller is forged from premium 50Mn steel and precision-machined to match OEM dimensional specifications. The tread surface undergoes induction hardening achieving HRC 40-55 with a 4-10 mm effective case depth for superior wear resistance. Sealed double-tapered roller bearings with lifetime grease lubrication ensure smooth rotation and minimal maintenance requirements. With over 35 years of undercarriage manufacturing expertise and ISO 9001:2008 certification, YT YinTai Parts provides reliable aftermarket solutions for Kobelco equipment fleets worldwide.

• Single flange profile engineered for precise track alignment on Kobelco SK200 and SK350 excavator undercarriages
• Forged 50Mn steel construction with optimal grain flow orientation for maximum fatigue resistance under cyclic loading
• Induction hardened tread surface at HRC 40-55 with 4-10 mm hardened depth for extended wear life in abrasive conditions
• Precision-ground roller tread minimizes vibration and noise during high-speed travel on pavement and hard surfaces
• Sealed lifetime-lubricated bearing system eliminates daily greasing and prevents water and dirt ingress
• Direct bolt-on replacement for Kobelco SK200-6, SK200-8, SK200-10, SK350LC-8, and SK350LC-10 models
• Environmentally durable coating system protects against corrosion in coastal, tropical, and high-humidity work sites

YT YinTai Parts operates a fully integrated manufacturing facility in Quanzhou, Fujian, China, spanning over 20,000 square meters. Our track bottom rollers undergo a rigorous production workflow: raw 50Mn steel inspection and cutting, precision forging or casting using 800-ton presses, CNC machining for exact dimensional accuracy to within ±0.02mm tolerance, heat treatment through induction hardening achieving HRC 40-55 surface hardness with 4-10mm hardened depth, precision grinding, shot blasting for surface finish, rigorous quality inspection including ultrasonic flaw detection and dimensional verification, anti-corrosion coating application, and final assembly with sealed lifetime-lubricated bearings. Each roller passes a 100% load testing protocol before shipment.

YinTai Parts (YT Brand) has served the global undercarriage parts market for over 35 years. Our factory in Quanzhou, Fujian Province, houses advanced CNC machining centers, automated forging lines, and in-house heat treatment facilities. We hold ISO 9001:2008 certification and CE marking, ensuring compliance with international quality and safety standards. Our engineering team of 50+ technical professionals continuously improves product designs using finite element analysis and fatigue testing. We export to over 60 countries across Asia, Europe, Africa, the Middle East, and the Americas, with an annual production capacity exceeding 120,000 track rollers. Our OEM and aftermarket replacement parts are trusted by construction companies, mining operations, and equipment dealers worldwide.

YT track bottom rollers for Kobelco SK200 and SK350 excavators are deployed across diverse applications including urban infrastructure construction, port and harbor development, mining support operations, forestry work, and demolition projects. Kobelco excavators are highly regarded in Japan and across Asian markets for their advanced hydraulic systems and fuel economy, making them a popular choice for contractors focused on operational cost efficiency. YT replacement rollers support these machines in general earthmoving, foundation digging, material loading, and site preparation tasks. The aftermarket availability of quality undercarriage parts enables Kobelco equipment owners to manage total cost of ownership while maintaining high machine availability during critical project phases.

Q1: Are YT bottom rollers compatible with all generations of Kobelco SK200 and SK350 excavators?
A1: Yes, our YT-SK200-350-SF bottom rollers are designed for compatibility with Kobelco SK200-6, SK200-8, SK200-10, SK350LC-8, and SK350LC-10 models. Please verify your specific model year with our technical team if you have an earlier generation machine.

Q2: Why is heat treatment important for track roller performance?
A2: Heat treatment through induction hardening creates a hard, wear-resistant surface (HRC 40-55) while maintaining a tough, impact-resistant core. This dual-property combination is essential for track rollers that must resist surface abrasion from soil and rocks while surviving impact forces from the machine weight and terrain.

Q3: How does YT ensure the dimensional accuracy of Kobelco replacement rollers?
A3: We use precision CNC machining centers calibrated to ±0.02mm tolerance. Each production batch is verified against OEM reference dimensions using coordinate measuring machines and specialized undercarriage inspection fixtures to ensure perfect mounting and alignment.

Q4: What is the advantage of using YT aftermarket rollers versus OEM Kobelco parts?
A4: YT aftermarket rollers offer 40-60% cost savings compared to OEM Kobelco parts while delivering comparable quality and performance. Our 35 years of undercarriage manufacturing experience and ISO 9001:2008 certification ensure consistent quality across all production batches.

Q5: Do you provide technical data sheets with hardness and material certification?
A5: Yes, each shipment can be accompanied by material certification documents, hardness test reports, and dimensional inspection records upon request. These documents support quality assurance processes for large fleet operators and government procurement requirements.

Q6: Can you manufacture rollers for older discontinued Kobelco models?
A6: Yes, our reverse-engineering capability allows us to manufacture bottom rollers for discontinued and legacy Kobelco models where OEM parts are no longer available. Provide a sample or detailed specifications for quotation.

All YT track bottom rollers are packaged in export-grade materials for maximum protection during transit. Standard packaging includes individual plastic wrapping, foam cushioning, and sturdy wooden pallets or plywood cases. Custom packaging options are available upon request including branded boxes and bulk packaging. Our products carry a warranty period of 12-18 months from the date of shipment, covering manufacturing defects and premature wear under normal operating conditions. Warranty claims are processed within 15 business days with photographic evidence and failure analysis. We provide full technical support and replacement parts for any warranty-covered issue.