High Precision Spindle Ball Bearings

GRW: highest speed and great bearing capacity

Spindle ball bearings are single-row angular contact ball bearings with a contact angle of 15° or 25° that can support load on one side. In respect of their design, their running accuracy and the materials used, they are optimised for highest speed and great bearing capacity.

GRW spindle ball bearings are characterised by the following properties:

  • Manufacture in grade P4 (or ABEC7) or better
  • Rings generally made of corrosion-resistant SV30 high-grade steel
  • Steel or ceramic balls available for all types
  • Machined solid retainer of fiber-reinforced phenolic resin or special materials, for example for applications involving higher temperatures
    15° (C) or 25° (E) contact angle as a standard
  • Optionally, bearings can be paired with three pre-defined preload classes (L, M, S) or individual preload
  • Oil or grease lubrication
  • Open and closed versions available
  • Assembly, lubrication and packaging pursuant to cleanroom grade 10,000

Open spindle ball bearings

  • Standard version with large balls for optimum utilization of the bearing interior and solid retainer for high bearing capacity.
  • The outer ring has one shoulder only. The increased height of the snap feature prevents bearing collapse.
  • Solid retainer guided on outer ring with low cross-section, particularly well suited for oil injection lubrication.

Closed spindle ball bearings

  • The non-contact shields do not cause any additional friction torque
  • The standard shields made of Viton with metal stiffener offer excellent temperature and media resistance
  • Very narrow sealing gap for high dust protection
  • Recommended for grease lubrication, increases the longer service life
  • Same outer dimensions as open spindle bearings
  • This design requires often smaller balls, resulting in a lower bearing capacity but higher axial stiffness and speed limit (usually signified by an index letter after the basic type in the part number).
  • Also available without closure as high-speed version

Handling evidence:

  • Leave the bearing in its air-tight package until you are ready to start the assembly.
  • Ensure extreme cleanliness at the workplace.
  • Avoid shocks and impacts.
  • Axial load must only act on spindle bearings as indicated by the <s></s>marks on the outer ring.
  • Use suitable assembly tools to ensure that no assembly forces can be transferred through the balls.
  • Duplex bearings of pairing types -1 (DB), -2 (DF), -3 (DT) are always packed in pairs and can only be assembled in the specified arrangement with the other bearing in the package.
  • Universally matched bearings can be freely paired with each other, i.e. you may combine bearings from different packages or lots. These bearings may be assembled in any arrangement.
  • Before start of operation, allow the bearing to run in at high speed.