Load rollers; indicative sizing

Enclosed length (IL) is the nominal size and therefore doesn't have a tolerance.

Interior Frame Size (IFM) may not be smaller than the enclosed length. This is to avoid having a spindle with internal thread not fit inside the frame or that the frame presses so hard against the labyrinth that the bearings no longer have any axial play and the roller does not rotate.

IFM = IL - 0.0 and + 0.5 mm

Spindle length (AL) may not be longer than the enclosed length if the spindle has an internal thread.
Therefore: AL = IL + 0.0 and - 0.5 mm. For other types of spindle, the spindle length tolerance is not so important.

For spindles with flats or an external thread, or for a stepped spindle, you can use the same tolerance: SWL, LOM or LOT = IL + 0.0 and - 0.5 mm.

Maximum Length across the tubing (LOB-max) should always be 0.5 mm less than the AL-, SWL-, LOM- minus two half nut depths or LOT-size so that it is not possible for the bearings to be put under pressure axially. Therefore: LOB-max = IL - 1.0 mm.

Minimum Length across the tubing (LOB-min) = LOB-max minus the tolerance of the tube, the labyrinths, the bearing cartridges and (where applicable) the conical bearings: LOB min = IL- 1.9 to 2.5 mm.

In the case of a load roller with spring-loaded spindle, for ease of assembly the Maximum Length across the tubing will be: LOB-max = IL - 2 mm.