Spindle bearings are single row angular contact ball bearings, comprising solid inner and outer rings and ball and cage assemblies with solid window cages. They cannot be dismantled. The bearings are available in open and sealed designs.
Spindle bearings have restricted tolerances. They are particularly suitable for bearing arrangements with very high requirements for guidance accuracy and high speeds. They have proved extremely suitable for main spindle bearing arrangements in machine tools.

Radial and axial load capacity:
The bearings can support axial forces in one direction as well as radial forces. Spindle bearings used in an O or X arrangement can support axial forces in both directions and moments. Bearings in a tandem arrangement can only support axial loads in one direction.
Spindle bearings are available with a contact angle α = 15° (suffix C) or α = 25° (suffix E).

Standard spindle bearings:
Standard spindle bearings B70, B719 and B72 have steel balls.
Spindle bearings HCB70, HCB719 and HCB72 have ceramic balls in standard sizes made from ceramic (hybrid bearings).
Spindle bearings B70..-2RSD, B719..-2RSD, B72..-2RSD,HCB70..-2RSD, HCB719..-2RSD and HCB72..-2RSD are sealed on both sides by gap seals.
Sealed bearings are greased with high performance grease and are maintenance-free.

High speed spindle bearings:
High speed spindle bearings HSS70 and HSS719 have smaller steel balls.
high speed spindle bearings HCS70 and HCS719 have ceramic balls in standard sizes made from ceramic (hybrid bearings).
These four series thus achieve higher speeds, have lower friction and heat generation, place less strain on the lubricant and have a longer operating life.
The bearings are sealed on both sides by gap seals.
Open bearings of series HS70 and HS719 as well as HC70 and HC719are also available.
Sealed bearings are greased with high performance grease and are maintenance-free.

Universal designs:
Spindle bearings of universal design can be fitted in any arrangement or combined in various sets without any loss of performance. The position of the pressure cone is marked on the cylindrical surface of the outer ring.
Bearings with the suffix UL are designed for slight preload in an X or O arrangement.
The preload is altered by mounting and the operating conditions.

Operating temperature:
The bearings are suitable for operating temperatures from –30 °C to+100 °C, restricted by the seal or cage material.
The standard grease for sealed spindle bearings is suitable up to a continuous temperature of +80 °C.
The operating temperature must be taken into consideration when selecting the lubricant.

Cage:
Spindle bearings have solid window cages made from hard fabric (suffixT). The cage is guided on the outer ring.

Suffix:
C Contact angle 15 °
E Contact angle 25 °
H High preload
L Slight preload
M Moderate preload
P4S Tolerance class P4S
T  Solid window cage made from hard fabric
UL Universal design, for example for fitting in pairs, bearing pair has slight preload in O and X arrangement
2RSD Spindle bearing with sealing shields on both sides (in series B and HCB)






Spindle bearings HC70..-E, adjusted, in pairs or sets, contact angle α = 25°, with ceramic balls, restricted tolerances
Spindle bearings HC719..-E, adjusted, in pairs or sets, contact angle α = 25°, with ceramic balls, restricted tolerances