NSK miniature ball bearings can be divided into two basic types, NSK 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 NSK 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.
NSK miniature ball bearing products
NSK miniature single-row deep groove ball bearings
NSK deep groove ball bearings have two inherent advantages; they can sustain some axial load in either direction as well as radial loads, and the two raceway cross-sections are simple circular arcs which can be very precisely finished so the miniature ball bearings have low friction and very little noise or vibration. Several different cage designs are available with different characteristics and the choice depends upon the individual application.
NSK deep groove ball bearings with flanged outer rings
NSK deep groove ball bearings with flanged outer rings correspond to ordinary ball bearings with snap rings. The flange extends around the entire circumference of the outer ring due to the size limitation and to improve its running accuracy. Since it is not necessary to provide a shoulder on the housing bore if this NSK bearing is used, the bore can be a simple cylindrical shape which facilitates high precision machining and also reduces the machining time.
NSK deep groove ball bearings with extended inner rings
NSK deep groove ball bearings with extended inner rings are inch series NSK miniature ball bearings with their inner rings extended equally on both sides by 1/64 inch (0.0156inch, 0.397mm) beyond the width of the outer ring. Since the inner ring is therefore wider by 1/32 inch than the outer ring, it is not necessary to provide a projection on parts installed in contact with the inner ring. This feature simplifies the design and fabrication of parts immediately surrounding the NSK bearing.
NSK deep groove ball bearings for synchros
NSK ball bearings for synchros are inch series bearings with their outer rings thickened radially. Their outer diameter is, therefore, large relative to the bore diameter. These bearings are mainly used for synchros but are convenient in some other applications.
NSK extra-thin-section deep groove ball bearings
NSK extra-thin-section deep groove ball bearings have a small radial cross-sectional thickness. NSK offers such bearings with bore diameters from 10 to 15mm. They are used when extreme compactness is improtant.
NSK miniature shielded and sealed bearings
NSK deep groove ball bearings often have shields or seals intalled on both sides and are factory-packed with a lubricant. The use of such NSK miniature ball bearings simplifies the structure around them and also their installation. It also eliminates the need for relubrication and, therefore, reduces maintenance costs. There are three types of such NSK bearings: shielded bearings, contact sealed bearings, and non-contact sealed bearings.
NSK miniature sigle-row angular contact ball bearings
NSK angular contact ball bearings can sustain radial loads and axial loads in only one direction. Those with one shoulder on the outer ring are generally used, but for extra-high speed operation, NSK miniature ball bearings with one shoulder on the inner ring are available. Angular contact ball bearings must be used in duplex pairs with a suitalbe preload. They are recommended for applications requring high speed and rigidity.
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