| Place of Origin |
Jiangsu China (Mainland) |
1.Material of knurling bushing machinery parts: C20,C45, 16Mn, St37-2 alloy steel,free cutting steel. 2.processing method: turning knurling turning grinding. 3.heat treating:annealing. 4.surface treatment:Zinc electro plated. 5.checking: Tensile and Yield Strength Surface Roughness geometric tolerance Form and Position Tolerance hardness and thickness of coating neutral salt spray test (NSS).