Axial/radial bearings YRT, RTC and YRT_Speed and axial angular contact ball bearings ZKLDF are ready-to-fit high precision bearings for high precision applications with combined loads. They can support radial loads, axial loads from both sides and tilting moments without clearance and are particularly suitable for bearing arrangements with high requirements for running accuracy, such as rotary tables, face plates, milling heads and reversible clamps.

Due to the fixing holes in the bearing rings, the units are very easy to fit.

The bearings are radially and axially preloaded after fitting.

The mounting dimensions of all series are identical.

Axial/radial bearings are also available with an angular measuring system. The measuring system can measure angles to an accuracy of a few angular seconds by non-contact, magneto-resistive means.

For standard applications with low speeds and small operating durations, such as indexing tables and swivel type milling heads, the most suitable bearing is generally series YRT, Figure 1. These bearings are available in two axial and radial runout accuracies.

Where comparatively lower friction and higher speeds are required, RTC bearings can be used, Figure 1. For higher requirements in accuracy, these bearings are also available with restricted axial runout accuracy.

For the bearing arrangements of direct drive axes, there is the series  YRT_Speed. Due to their high limiting speeds and very low, uniform frictional torque across the whole speed range, these bearings are particularly suitable for combination with torque motors, Figure 1.

Axial angular contact ball bearings ZKLDF are particularly suitable for high speed applications with long operating duration, Figure 1. They are characterised by high tilting rigidity, low friction and low lubricant consumption.

Axial/radial bearings YRT, RTC and YRT_Speed have an axial component and a radial component.

The axial component comprises an axial needle roller or cylindrical roller and cage assembly, an outer ring, L-section ring and shaft locating washer and is axially preloaded after fitting. The radial component is a full complement (YRT, RTC) or cage‑guided, preloaded cylindrical roller set. The outer ring, L-section ring and shaft locating washer have fixing holes.

The unit is located by means of retaining screws for transport and safe handling.

Axial/radial bearings are supplied without seals.

Bearings of series YRT and YRT_Speed are greased using a lithium complex soap grease to GA08 and can be lubricated via the outer ring and L-section ring. Arcanol LOAD150 is suitable for relubrication.

Bearings of series RTC are greased with Arcanol MULTITOP.

Axial angular contact ball bearings ZKLDF comprise a single-piece outer ring, a two-piece inner ring and two ball and cage assemblies with a contact angle of 60°. The outer ring and inner ring have fixing holes for screw mounting of the bearing on the adjacent construction.

The unit is located by means of retaining screws for transport and safe handling.

Axial angular contact ball bearings have sealing shields on both sides.

The bearings are greased with a barium complex soap grease to DIN 51825–KPE2K–30 and can be lubricated via the outer ring.

Axial/radial bearings and axial angular contact ball bearings are suitable for operating temperatures from –30 °C to +120 °C.

Suffixes for available designs: see table. 

Available by agreement: For YRT, axial and radial runout tolerance restricted by 50%. Additional text: axial and radial runout 50%.

For RTC, axial runout tolerance restricted by 50%. Additional text: axial runout 50%.

For YRT, closer tolerance on mounting dimension H₁ and H_2. Additional text: H₁ with tolerance ± ..., H₂ with tolerance ± ... For restricted tolerance value, see table.