Seal carrier assemblies DRS are screw mounted to the outer ring of needle roller/axial cylindrical roller bearings ZARF(L) and precisely centred in this position, Figure 1, . They seal the bearings against outside influences.

The sealing elements are supplied as a complete kit and comprise a seal carrier with an integral rotary shaft seal, a gasket and hexagonal socket cap screws for fixing the carrier to the central washer of the bearing.

Seal carrier assemblies are suitable for operating temperatures from –30 °C to +120 °C, restricted by the seal material.

Precision locknuts are used where high axial forces must be supported and high runout accuracy and rigidity are required, Figure 2, , Figure 3, .

The thread and the axial face of the locknut in contact with the rolling bearing are produced in a single clamping operation. This allows very high runout accuracy to be achieved.

Locknuts are available in the designs AM, ZM and ZMA. If handled correctly, they can be reused several times.

Locknuts of series AM are divided into several segments for applying the locking forces. When the hexagonal socket grub screws are tightened, the segments are elastically deformed. As a result, the thread flanks of the segments are pressed against the flanks of the shaft thread and give a high frictional force that acts to prevent loosening of the nut. The runout of the nut is not affected by this method of locking.

Locknuts ZM and ZMA are secured against rotation by means of two radially acting locking pegs, Figure 3, . ZMA is the heavy series.

The locking pegs are manufactured together with the internal thread of the locknut. They mesh in the thread of the shaft without affecting the runout or damaging the thread, Figure 3, .

The locking pegs are secured by grub screws with a hexagonal socket arranged concentrically over the locking pegs, Figure 3, .