~body:Surface Hardness HRC 50~54Use MnB as material and fully heat-treated technology to enhance wear-resistance. Axle:Surface heat-treated to ensure the strength and performance of products/ using 100% Digital-control processing device to ensure the dimensional accuracy and quality stability. Cover: Made by high-quality casting steel. Seal:Special casting steel ring with O-ring, apply to extremely working environment. Sleeve:Surface-coated with Copper to enhance wear-resistance Supply ...