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buy D6H D6R Undercarriage Track Carrier Rollers LB 82.2 B-6

Material: They are usually made of high - quality alloy steel, such as 35MnB, 40MnB, or 50Mn. For example, some track carrier rollers use 50Mn steel, and the surface hardness can reach 56 - 62 HRC. Surface Hardness and Hardening Depth: The surface hardness is generally in the range of HRC 52 - 58, and the hardening depth is 8…