Removing the rollers is equally as simple. The keeper bar is welded to the frame and rests against the flat surface of the axle, preventing it from rotating. The hole is for a cotter pin which holds the axle in the frame. Wall thickness is expressed in either a gauge or a decimal dimension. Counter Bored rollers have a tube which has its inside diameter bored to the correct size for the bearing to be press fit into place.
Crimped rollers have a tube which is crimped down over the bearing to hold it into place.
Bearings installed in this manner are non-replaceable. Rollers provided with an Adapter use a combination of a bearing and an adapter. The bearing is first press fit into the adapter and the adapter is then press fit into the tube. Roller Capacities Roller capacity refers to the maximum load a single roller can support. Angular deflection of axle at the bearings is limited to .75 for cylindrical semi-precision and precision bearings.