The static load safety factor S₀ is the security against permanent deformation at the rolling contact and is determined as follows:

The static load safety factor S₀ must be ≧ 3.

In order to ensure operation without slippage, the bearings must be subjected to a minimum load F_r min in a radial direction. This applies in particular to high speed bearings since, if the radial load is insufficient or not present, damaging sliding motion may occur between the rolling elements and raceways. In continuous operation, a minimum radial load of the order of P ≧ 0,02 · C_r is necessary.

The speeds n_G in the dimension tables are valid for oil lubrication. If grease lubrication is used, the permissible value is 60% of the stated value.

For drawn cup needle roller bearings without an inner ring, the rolling element raceway must be hardened and ground, see table. The surface hardness must be 670 HV, the hardening depth CHD or SHD must be sufficiently large.

In order to fully utilise the load carrying capacity of the bearings, sufficient rigid support must be provided for the thin-walled outer rings.

The bore tolerance is dependent on the housing material. The recommended tolerances are listed in the table.

The shaft and housing bore must have a lead chamfer of 10° to 15°.

Drawn cup needle roller bearings are located in the housing bore by means of a press fit. They are pressed into the bore and require no further axial locating elements.

The bearings should be installed using a special fitting mandrel, Figure 1. The shoulder of the fitting mandrel must rest against the end face of the bearing. This is indicated by the designation.

A toroidal ring should be used to retain the bearing. The length and oversize of the ring must be matched by the customer to the dimensions and mass of the bearing.

If grease lubrication is to be used, the bearings should be lubricated with grease before fitting.

Drawn cup bearings must not be tilted while they are being pressed in.

The forces occurring during pressing-in are dependent on several factors. The fitting situation should be arranged so that the bearing rib on the end face is not deformed.

If the application requires a fitting procedure different from the one described, fitting trials must be carried out in order to ensure that the bearings can be fitted correctly and without causing damage.