Adapter and Withdrawal Sleeves are devices using to mount and secure rolling bearings with tapered bores onto cylindrical shaft seats.

This enables the mounting or dismounting of rolling element bearings in a simple and effective way for a variety of applications.

Since, adapter and withdrawal sleeves are able to adapt to shaft diameter variations within certain limits, larger than normal shaft diameter tolerances are accommodated.

The geometrical accuracy, however, must be more closely defined, as the form errors of the shaft affect the running accuracy of the total bearing arrangement in a direct way.

Furthermore, using adapter or withdrawal sleeves allows bearing seats with lower surface qualities, (e.g. turned surfaces) to be acceptable.

For applications where no accurate shaft guidance of bearings is required, bright drawn round bar stock may also be used.

Adapter sleeves (see sketch below) are slotted steel sleeves that have a tapered outer diameter, taper 1:12 on one side and a thread on the opposite side.
Small adapter sleeves may have phosphated surfaces, normally they are only oil preserved.

NKE adapter sleeves are supplied complete with lock nut and locking washer as standard.

Beside the standard design (see figure a ), there are also larger adapter sleeves available with oil bores and oil distribution ducts, (prefix OH) as required for applying the oil injection method as shown in figure b.

All information courtesy and copyright NKE Bearings Austria www.nke.at