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Ball Bearing

NSK manufacture a full range of deep groove ball bearings. These bearings are the most common type and are used in a wide variety of applications.

Product List

Single-Row Deep Groove Ball Bearings

Pressed Steel Cages
Single-row deep groove ball bearings are the most common type of rolling bearings. Their use is very widespread.
In addition to open type bearings, these bearings often have steel shields or rubber seals installed on one or both sides and are prelubricated with grease. Also, snap rings are sometimes used on the periphery. As to cages, pressed steel ones are the most common.
For big deep groove ball bearings, machined brass cages are used.
Machined cages are also used for high speed applications.

 


Extra Small Ball Bearings and Miniature Ball Bearings

Miniature and instrument ball bearings can be divided into two basic types, deep groove and angular contact. The first (deep groove) can be further divided into the following five classes depending on their design details:

  • Standard type
  • Flanged outer ring
  • Extended inner ring
  • Expanded type in which one ring has a radial thickness that is larger than normal compared with the bearing width.
  • Thin section type in which both rings are extra thin in the radial direction. They can also be classified as: open, shielded, or sealed.

    Maximum-Type Ball Bearings

    Maximum-Type ball Bearings contain a larger number of balls than normal deep groove ball bearings because of filling slots in the inner and outer rings. Because of their filling slots, they are not suitable for applications with high axial loads. BL2 and BL3 types of bearings have boundary dimensions equal to those of single-row deep groove ball bearings of Series 62 and 63 respectively. Besides the open type, ZZ type shielded bearings are also available. When using these bearings, it is important for the filling slot in the outer ring to be outside of the loaded zone as much as possible. Their cages are pressed steel.


    Magneto Bearings

    The inner groove of magneto bearings is a little shallower than that of deep groove bearings. Since the outer ring has a shoulder on only one side, the outer ring may be removed. This is often advantageous for mounting. In general, two such bearings are used in duplex pairs. Magneto bearings are small bearings with a bore diameter of 4 to 20 mm and are mainly used for small magnetos, gyroscopes, instruments, etc. Pressed brass cages are generally used.

The NSK range of angular contact ball bearings has been designed to meet the increasingly demanding requirements of original equipment manufacturers. These bearings have a contact angle so that they can sustain significant axial loads in one direction together with radial loads. Furthermore, since an axial component is generated when a radial load is applied, these bearings are generally used in pairs, triplex sets, quadruplex sets, or multiplex sets. NSK offers one of the most comprehensive ranges of angular contact ball bearings available.

Features

  1. High Quality Steel — Ultra clean steel to extend bearing life by up to 80%.
  2. Advanced Grease Technology — NSK lubricants that can extend grease life and performance.
  3. High Grade Balls — Quiet and smooth operation even at high speed.
  4. Super Finished Raceways — Specially honed to minimise noise and improve lubricant distribution and life.
  5. Contact Angle — Offered in 15, 25, 30 and 40 degree angles.
  6. Cages — Available in a range of Polyamide, steel and brass cage assemblies.

Product List

Single-Row Angular Contact Ball Bearings
(Pressed Steel Cages & Machined Brass Cages)

Since these bearings have a contact angle, they can sustain significant axial loads in one direction together with radial loads. Because of their design, when a radial load is applied, an axial force component is produced; therefore, two opposed bearings or a combination of more than two must be used.
Since the rigidity of single-row angular contact ball bearings can be increased by preloading, they are often used in the main spindles of machine tools, for which high running accuracy is required.
Usually, the cages for angular contact ball bearings with a contact angle of 30° (Symbol A) or 40° (Symbol B) are in accordance with Table 1, but depending on the application, machined synthetic resin cages or molded polyamide resin cages are also used. The basic load ratings given in the bearing tables are based on the cage classification listed in Table 1


Matched Angular Contact Ball Bearings

The types and features of matched angular Contact Ball bearings are shown in Table 2

 

 


Double-Row Angular Contact Ball Bearings

This is basically a back-to-back mounting of two single-row angular contact ball bearings, but their inner and outer rings are each integrated into one. Axial loads in both directions can be sustained, and the capacity to sustain moments is good. This type is used as fixed-end bearings.
Their cages are pressed steel.

 

 


Four-Point Contact Ball Bearings

The inner ring is split radially into two pieces. Their design allows one bearing to sustain significant axial loads in either direction.
The contact angle is 35°, so the axial load capacity is high. This type is suitable for carrying pure axial loads or combined loads where the axial loads are high.
The cages are made of machined brass.

This type of ball bearing is recommended when alignment of the shaft and housing is difficult and the shaft may flex. The outer ring has a spherical raceway and its center of curvature coincides with that of the bearing; therefore, the axis of the inner ring, balls and cage can deflect to some extent around the bearing center. Pressed steel cages are usually used. Since the contact angle is small, the axial load capacity is low. The permissible dynamic misalignment is approximately 0.07 to 0.12 radian (4 to 7 degrees) under normal loads.
However, depending on the surrounding structure, such an angle may not be possible.

Product List

Thrust ball bearings are classified into those with flat seats or aligning seats depending on the shape of the outer ring seat (housing washer). They can sustain axial loads but no radial loads. For Single-Direction Thrust Ball Bearings, pressed steel cages and machined brass cages are usually used The cages in Double- Direction Thrust Ball Bearings are the same as those in Single-Direction Thrust Ball Bearings of the same diameter series.

 

 

Features

  1. Available in two designs: single direction and double direction.
  2. To accommodate initial misalignments in an assembly both designs are available with spherical aligning seats or aligning seat washers.
  3. High quality steel-ultra clean steel to extend bearing life by up to 80%.
  4. Advanced Grease Technology — NSK lubricants that can extend grease life and performance.
  5. High Grade Balls — Quiet and smooth operation even at high speed.
  6. Optional seating rings take initial misalignment.

Product List

Single-Direction Thrust Ball Bearings

Axial loads in one direction can be sustained.

 

 

 

 

 


Double-Direction Thrust Ball Bearings

Axial loads in both directions can be sustained by shaft sleeve.

 

Extremely thin-section ball bearings and roller bearings contributing to downsizing, weight saving, and reduction of torque loss of robots, construction equipments, and industrial machinery.
Features
1. Low frictional and irregular torque ensure highly efficient power transmission and smooth rotating performance.
2. The high accuracy of the bearings enables excellent high-speed performance.

Product List

Basic Specification

  • n/am³/hr
  • n/abar
  • n/acPs
  • n/a°C
  • 0mm
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