1.high quality roller 2.fast delivery roller 3.Certification:ISO9001:2000 4.High hardness:HRC55~59 5.Material: 50mn or 40c Excavator carrier roller Features and Benefits 1. Surface hardness: HRC 52-58 2. Hardness depth: 5.5~10mm 3. Technology: forging steel 4. Guarantee time: 6 month 5. Excellent mechanical properties 6. High strength and superior wear resistence 7. Reliable and long life time guaranteed 8. Heavy loaded capacity up to 50tons without compromising proper function of the excavators reliable quality. Description 1.Our track rollers operate perfectly under all working conditions and have high rail wear resistance. The superior quality is the result of a decade of experience in undercarriage parts.On the base of the principle of customer priority and technology, we have produced the bestproduct with special knowhow about forging, casting, heat treatment, welding, oiling and Assy 2.Each roller shaft is engineered drop-forged and machined by the utilization of the most modern technological advances known to the industry , Grinding and finishing methods , etc to guarantees max strength , max life . 3.Each roller shell is carefully heat treated to ensure long wear life and stress resistance . 4.surface hardness HRC52~59for reduced wear and longer life, adding value to your products further to your business by maximizing durability of your products.