D6D Bulldozer Bottom Track Rollers Double Flanged OEM Supported

Roller Body: Forged by 40Mn2 steel, which has good strength and wear - resistance. Center Shaft: Forged by 42CrMo steel, with high strength and good toughness. Heat Treatment Roller Body: The surface heat treatment hardness is HRC 48 - 55, and the heat - treatment depth is 5 - 8 mm. Center Shaft: The surface heat - treatment hardness can reach HRC 48 - 55, which is more wear - resistant, and the core hardness is HRC 28 or above, not easy to fracture.