There are two types of roller bearing mounts: one is a punch bearing mount, and the other is a cast iron (gray iron) bearing mount. The punch bearing mounts are mostly welded to steel pipes, while cast iron bearing mounts are typically extruded onto steel pipes. The punch bearing mounts feature good sealing and strong overall load-bearing capacity. The cast iron bearing mounts, on the other hand, have high concentricity but lower load-bearing capacity compared to the punch bearing mounts.