Deep Groove Ball Bearings



NSK manufactures a full range of deep groove ball bearings (DGBBs). These versatile bearings are the most common type and serve a wide variety of industries.

Besides radial loads, DGBBs can take axial loads in both directions and offer low frictional torque and high-speed components ideal for applications requiring low noise and vibration.

Product List

Single-Row Deep Groove Ball Bearings

Single-row deep groove ball bearings are the most common type of rolling bearing. The raceway grooves in the inner and outer rings form a circular arc with a radius slightly larger than that of the balls.
In addition to open varieties, these bearings may have steel shields or come pre-lubricated with grease maintained by rubber seals installed on one or both sides. Snap rings are sometimes used on the outside diameter of the outer ring.
Cages are generally made of pressed steel, though large bearings and bearings designed for high-speeds may use machined brass cages.


  • Support radial and axial loads
    Single-row DGBBs can sustain radial loads and axial loads in both directions.
  • Proven performance
    DGBBs are the most common type of bearing and are used in countless applications.


  • Low noise/vibration applications
    DGBBs provide low frictional torque and high rotational speed ideal for equipment where noise and vibration must be avoided.
  • Industrial motors, servomotors, stepper motors, electric machinery, agricultural machinery (tractors, string trimmers), textile machines, carriers/conveyance, film rolling mills, powder/particle clutches, outboard boat motors, etc.
Extra Small Ball Bearings and Miniature Ball Bearings

Small, miniature, and instrument precision bearings broadly come in deep groove and angular contact varieties. Deep-groove types may have a flanged outer ring, special inner ring width, thin-walled cross-sections, or a special shape for synchros. These bearings can come open, sealed, or shielded.


  • Wide lineup
    An assortment of models suit both general and special applications.
  • Various protective configurations
    Available in open, sealed, and shielded types.


  • Measuring instruments
Maximum Ball Bearings

Filling slots in the inner and outer rings allow maximum ball bearings to contain a larger number of balls than normal deep groove ball bearings; however, the slots make them unsuitable for applications with high axial loads.
BL2 and BL3 types have boundary dimensions equal to those of Series 62 and 63 single-row deep groove ball bearings respectively.
ZZ-type shielded bearings are available in addition to open bearings.
When using these bearings, the filling slot in the outer ring should be positioned outside of the loaded zone as much as possible.
Maximum ball bearings feature pressed steel cages.


  • High radial load capacity
    Maximum ball bearings can support large radial loads as they contain more balls than deep groove ball bearings.
    However, they are not suitable for axial loads due to their ball filling slots.
  • Standard dimensions
    Shared boundary dimensions (BL2/Series 62, BL3/Series 63) allow for easy replacement.


  • Transport/conveyance equipment, gearboxes in agricultural machinery
Magneto Bearings

The inner ring groove of magneto bearings is slightly shallower than that of deep groove bearings and the outer ring bore diameter on the side without a shoulder is cylindrical from the bottom. The outer ring may be separated, allowing easier mounting.
In general, two of these bearings are used together in a paired mounting (sometimes called “duplex pairs”).
Magneto bearings are small bearings with a bore diameter of 4 to 20 mm. Pressed brass cages are standard, though machined synthetic resin cages can be used for high-speed rotation.


  • Unique design
    Magneto bearings feature a shallower inner ring groove than deep groove ball bearings and a shoulder on only one side of the outer ring groove (counter-bored outer ring).
  • Easy-to-mount
    A separable outer ring helps make mounting easier.


  • Transport/conveyance equipment, gearboxes in agricultural machinery


answersLoads are defined by their direction. Loads perpendicular to the shaft are called radial loads and loads parallel to the shaft are called axial (thrust) loads.


answersWhile DGBBs can handle axial loads in both directions, single-row angular contact ball bearings can only receive axial load in one direction.


answersSeals and shields offer additional protection for bearing components and help to improve and maintain lubrication. In terms of sealing performance, sealed bearings rank best, followed by shielded bearings, then finally open bearings.
NSK uses supplementary designations D, DU, DW, and V (DD, DDU, DDW, VV) for sealed bearings and Z (ZZ) for shielded bearings. No supplementary designations are listed for open bearings.


Industry Applications