Application: Fit Kubota KX91-3, KX91-3S & KX91-3S2 Not fit KX71, KX91-2/2S or U35-4 Roller Specifications: 1. Shell Material: 50Mn, through hardened HRC 25-28, case hardened HRC52-56, hardened thickness 5-8mm 2. Side cover: QT450-10 Strength is as follows Tensile strength σb (MPa): ≥450 Yield strength σ0.2 (MPa): ≥310 Hardness: 160 ~ 210 hb 3. Roller, 45# carbon steel or 40Cr, quenched HRC25-30, surface quenched HRC52-58, hardened to a depth of 2-3mm 4. Locking pin, 65Mn or 45 carbon steel, hardened HRC25-28 5. Bolt, grade 12.9, HRC45-52. 6 6. Seal: Nitrile rubber. Operating temperature range -20℃ to 110℃ Description: 1. Wheel body: material 50 Mn, hardening hardness HRC 25-28, case hardening hardness HRC 52-56, hardening thickness 5-8mm 2. Side cover: QT 450-10, strength as follows: tensile strength ob (MPa): 2450 yield strength 00.2 (MPa): 2310 hardness: 160 ~ 210 hb 3. Roller: 45 # carbon steel or 40 Cr. Quenching of HRC25-30 and surface quenching of HRC 52-58. Hardening depth of 2-3mm 4. Lock pin 65 Mn or 45 carbon steel, hardness HRC 25-28 5. Bolts, grade 12.9, HRC 45-52 6. Seal: nitrile rubber. Operating temperature range-20℃ to 110℃ Features: 1. This bottom roller is a durable undercarriage replacement part for your excavator 2. Our rollers utilize special high strength-hardened steel and quality seal groups that provide excellent lubricating oil retention 3. Sealed bearings stop dirt, mud, and grime from penetrating inner components 4. It was designed and manufactured to exact OEM specifications using a high-quality, high-strength steel 5. It will provide long-lasting and dependable performance even if you operate in the most extreme conditions
