Car & Truck Radiators. OFFER ACCEPTED or WATCH IT, WE SEND U OFFER. Note: Pls check the item. To get the suitable item. Part Type: Bottom Roller. Compatible Equipment Type: Excavator. Material 50Mn, through hardened HRC 25-28, CASE hardened HRC52-56, hardened thickness 5-8mm. Yield strength? 0.2 (MPa):? 310. Roller, 45# carbon steel or 40Cr, quenched HRC25-30, surface quenched HRC52-58, hardened to a depth of 2-3mm. Bolt, grade 12.9, HRC45-52. This bottom roller is a durable undercarriage replacement part for your excavator. Our rollers utilize special high strength-hardened steel and quality seal groups that provide excellent lubricating oil retention. Sealed bearings stop dirt, mud, and grime from penetrating inner components. It was designed and manufactured to exact OEM specifications using a high-quality, high-strength steel. It will provide long-lasting and dependable performance even if you operate in the most extreme conditions. Please make sure it will fit your machine before purchasing it. If you are not 100% sure this is what you need, please find out your engine model, series number and contact our Customer-service. Communication is the best way to solve the problem. If you have any problems after you. Our items include car/motor radiator(1/2/3/4/ Row Core), intercooler, overflow tank, exhaust pipe hose, wheel spacers. We pay high attention to customer service, and cherish every customer. So if you have any problem. Pls feel free to contact with us. Radiator is a performance aftermarket car parts company providing a variety of aluminum radiator for all sorts of makes and models. Shop with us with confidence you would be receiving the best quality products for the value. No matter if it’s for a car or truck we have exactly what you’re looking for! We accept return in 30 days and appreciate communication in advance! All return items MUST be in brand new condition which means the item is never installed and kept in the original packaging. With RA#, we may address return issues with high efficiency.