35MnBH Steel Excavator Track Chain Link with HRC 40-55 Hardness and 190.0 mm Link Pitch for Kobelco Undercarriage

The SK200-SK350-TL Track Chain Link is a premium undercarriage component manufactured by YT (YinTai Parts), engineered for demanding excavator and bulldozer applications across construction, mining, and earthmoving projects. With over 35 years of manufacturing expertise based in Quanzhou, Fujian, China, our factory produces track chain links that meet stringent OEM specifications for major equipment brands worldwide.

Each track chain link is forged from 35MnBH high-grade alloy steel and undergoes a rigorous heat treatment process to achieve surface hardness levels of HRC 40-55 with a hardened depth of 4-10 mm. This advanced metallurgical treatment ensures exceptional wear resistance, extended service life, and reliable performance even in abrasive working conditions commonly encountered in mining, quarrying, heavy construction, and forestry operations.

• Kobelco-Specific Dimensional Engineering: Link geometry and pin bore positions are precisely engineered to match Kobelco SK series undercarriage specifications, ensuring perfect sprocket tooth engagement and smooth track rotation without binding or skipping during machine travel and swing operations.
• Dual-Stage Heat Treatment Process: Our two-stage heat treatment combines high-temperature austenitizing for complete phase transformation with precisely controlled tempering to achieve the optimal balance of surface hardness and core ductility required for the varied working conditions encountered by Kobelco excavators.
• Shot Peened Surface Conditioning: All critical link surfaces undergo controlled shot peening after heat treatment to induce beneficial compressive residual stresses, significantly improving fatigue resistance and extending the operational life of components subjected to cyclic bending and impact loading.
• Precision Bore Finishing: Pin and bushing bores are finished to exact dimensional tolerances using CNC honing equipment, ensuring consistent interference fits that prevent loosening while allowing proper pin rotation for even wear distribution across all joint surfaces.
• Corrosion Inhibitor Coating: A specialized rust-preventive coating is applied to all link surfaces after final machining, providing extended corrosion protection during overseas shipping container transport and outdoor storage at distributor warehouses and job sites.
• Complete Quality Documentation Package: Each shipment includes material test certificates, heat treatment process records with hardness testing data, dimensional inspection reports, and certificate of origin, supporting customs clearance and end-user quality assurance requirements.

At YT(YinTai Parts), our manufacturing process begins with the careful selection of 35MnBH steel raw material sourced from certified Chinese steel mills. The steel billets are heated to precise forging temperatures of 1100-1200 degrees Celsius in computer-controlled induction furnaces before being shaped under 2500-ton forging presses. Each link blank undergoes precision machining on CNC milling centers to achieve exact dimensional tolerances within ±0.1mm accuracy. The critical heat treatment stage involves austenitizing at 850-880 degrees Celsius followed by controlled oil quenching and tempering to achieve the specified HRC 40-55 surface hardness with 4-10mm hardened case depth. After heat treatment, every link passes through shot blasting for surface cleaning and stress relief. Final quality inspection includes magnetic particle testing for surface defects, ultrasonic testing for internal integrity, and coordinate measuring machine verification of all critical dimensions against OEM specifications.

YT (YinTai Parts) has been a trusted manufacturer of construction machinery undercarriage components since 1988, accumulating over 35 years of industry experience from our production base in Quanzhou, Fujian Province. Our 50,000-square-meter manufacturing facility is equipped with advanced forging lines, CNC machining centers, automated heat treatment furnaces, and comprehensive material testing laboratories. We hold ISO 9001:2008 quality management certification and CE certification for our exported products, ensuring compliance with international quality and safety standards. Our dedicated R&D team of 25 engineers continuously works on material improvements and design optimization to extend product service life. With an annual production capacity exceeding 120,000 track chain link assemblies, we serve distributors, equipment dealers, and end users in over 60 countries across Southeast Asia, the Middle East, Africa, South America, and Europe. Our in-house logistics team manages container loading, customs documentation, and international shipping coordination to ensure timely delivery worldwide.

These excavator track chain links are designed for Kobelco SK200 through SK350 series hydraulic excavators, covering the complete range of 20 to 35 ton machines commonly used in urban construction, road works, utility trenching, demolition, and general earthmoving applications. Kobelco excavators are recognized for their fuel efficiency and operator comfort in the Asia-Pacific, Middle East, and European markets, where our aftermarket undercarriage components provide cost-effective maintenance solutions without compromising machine performance. Equipment rental companies with mixed Kobelco fleets benefit from reduced undercarriage maintenance costs, while independent repair workshops appreciate the consistent quality and straightforward installation of our direct-fit replacement links during track chain rebuilds.

Q: Are these links compatible with both Kobelco SK200 Mark III and Mark IV series?

Yes, our SK200 SK350 track chain links are designed for compatibility across Kobelco SK200 Mark III, Mark IV, and subsequent series machines as well as SK210, SK250, SK290, SK300, SK330, and SK350LC models. The undercarriage specifications remained consistent through these model iterations. We recommend confirming your machine serial number for final compatibility verification.

Q: How do these links perform in demolition applications with continuous concrete debris contact?

The HRC 40-55 surface hardness and 4-10mm hardened case depth provide good resistance to abrasive wear from concrete debris. For intensive demolition work, we recommend more frequent undercarriage inspections at 250-hour intervals to monitor link rail and pin boss wear conditions compared to the standard 500-hour inspection schedule for general construction.

Q: Can you provide track chains with master links for on-site installation?

Yes, our track chain assemblies are supplied with master pin connections for straightforward on-site installation. Complete installation instructions are included with each shipment. We recommend using a portable track press tool for safe and efficient master pin installation and removal.

Q: What is the weight of a complete track chain assembly for shipping calculations?

A complete pair of track chain assemblies for SK200 series machines weighs approximately 1,200-1,500 kg depending on the number of links. For SK350 series machines, the weight ranges from 1,800-2,200 kg. Exact shipping weights and dimensions are provided with each quotation for accurate freight cost calculations.

Q: Do you stock these links for immediate dispatch or are they made to order?

We maintain safety stock for popular Kobelco SK200 and SK210 series track chain links to support urgent requirements with 7-10 day dispatch. Less common SK250, SK300, SK330, and SK350 links are typically manufactured to order with a 15-25 day lead time. We recommend contacting our sales team to check current stock availability for your required specifications.

All track chain link assemblies are packaged in export-grade wooden pallets or steel crates with protective anti-rust coating applied to all machined surfaces before shipment. Each pallet is clearly labeled with product model, quantity, batch number, and manufacturing date for easy identification and inventory management. We offer comprehensive warranty coverage of 18-24 months from the date of shipment against manufacturing defects and premature wear under normal operating conditions. In the unlikely event of a warranty claim, our technical support team provides prompt response within 24 hours and arranges replacement parts shipment within 7 working days. Custom packaging options including branded packaging, retail-ready box packaging, and OEM neutral packaging are available upon request to meet specific distribution channel requirements.