Design considerations

Single row tapered roller bearings must be used either with a second bearing (fig. 1) or as a matched pair (→ Matched tapered roller bearings). The bearings must be adjusted against each other until the requisite clearance or preload is obtained (→ Selecting preload).
When the operating clearance in a bearing arrangement is too large, the load carrying capacity of both bearings cannot be fully utilized. Excessive preload increases friction, which increases the amount of frictional heat and reduces bearing service life.

Adjustment procedure

When adjusting tapered roller bearings against each other, the bearings must be rotated so that the rollers assume their correct position, i.e. the large end face of the rollers must be in contact with the guide flange.

Fits for inch bearings

In contrast to metric bearings, which are machined to a minus tolerance, inch bearings are machined to a plus tolerance (table 1). Therefore, the deviations for shaft and housing diameters for metric bearings are not applicable.
Table 2 and table 3 provide suitable shaft and housing fits for inch tapered roller bearings. These fits are valid for bearings with Normal tolerances in typical applications.
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