There are two types of roller bearing mounts: one is a pressed bearing mount, and the other is a cast iron (gray iron) bearing mount. The pressed bearing mounts are mostly welded to steel pipes, while the cast iron bearing mounts are all extruded with steel pipes. The pressed bearing mounts feature good sealing and strong overall load-bearing capacity. The cast iron bearing mounts are particularly known for their high concentricity, but their load-bearing capacity is lower than that of the pressed bearing mounts.