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Precision Bearings

Further Information

Precision Bearings

Spindle bearings are a 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 suitability for high speeds. They have proved extremely suitable for spindle bearing arrangements in machine tools.

FAG Precision Bearings

Standard spindle bearings B70, B719 and B72 have steel balls.

X-life ultra bearings have bearing rings made from corrosion-resistant steel that contains nitrogen and has a particularly fine structure (prefix X) and ceramic balls. They fulfil very high requirements for speed and load carrying capacity. The bearings have a longer life compared to conventional bearings. Most of the spindle bearings are available as X-life ultra bearings.


  • C: Contact angle 15°
  • E: Contact angle 25°
  • H: High preload
  • L: Slight preload
  • M: Moderate preload
  • P45: Tolerance P45
  • T: Solid window cage made from hard fabric or high performance plastic
  • 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)


Nachi Precision Bearings

Precision bearings from Nachi are renowned worldwide as high-technology components. Industrial automation, robot technology, mechanical engineering, machine tools, printing machines and other applications are areas where series 70,72 and 79 single-row angular contact ball bearings, series NN30 double row cylindrical roller bearings and also TAB series double-row angular contact ball bearings are particularly popular.


  • Single bearing
  • Duplex bearing
  • P4: Tolerance P4



Last Modified: 12th Mar 2021