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Radial ball bearings

Deep groove ball bearings

Photo: Deep groove ball bearings

The most typical type of bearing, these are used in a wide range of fields. They include grease-enclosed sealed and shield bearings for ease of use.

Other types include bearings with a locating snap-ring to facilitate positioning when mounting the outer ring, expansion compensating bearings that absorb variations in bearing fitting surface dimensions due to housing temperature, and TAB bearings that are resistant to contamination in lubricating oil.

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Angular contact ball bearings

Photo: Angular contact ball bearings

In these ball bearings, the direct line that connects the inner ring, balls, and outer ring has a given angle in the radial direction (the contact angle).

This angle is generally designed with three kinds of contact angle.

These bearings can bear axial loads, but because of the contact angle cannot be used singly and must be used in pairs or combinations.

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Duplex angular contact ball bearings

Photo: Duplex angular contact ball bearings

These are bearings combining two or more angular ball bearings in back-to-back arrangement, face-to-face arrangement, or tandem arrangement.

Face-to-face duplex (DF) or back-to-back duplex (DB) bearings can bear axial loads in both directions. Back-to-back duplex bearings have a higher moment load bearing capacity than face-to-face duplex bearings. Tandem duplex bearings can bear a larger single-direction axial load than single bearings.

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Four-point contact ball bearings

Photo: Four-point contact ball bearings

These are angular contact ball bearings with the inner ring divided into two. When the outer ring and inner ring are pushed in the radial direction, the balls make contact with the inner ring and outer ring at four points. One bearing is able to bear an axial load from both directions, and can be used in a two-point contact state under a general pure axial load or under a composite load with large axial load.

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Double-row angular contact ball bearings

Photo: Double-row angular contact ball bearings

These have a structure that arranges single row angular contact ball bearings as back-to-back duplex (DB) bearings, uniting both the inner ring and outer ring.

They are able to bear radial loads and bi-directional axial loads, with ability to bear moment loads as well.

Both seal-type and shield-type bearings are available, with rated loads differing from open types.

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Self-aligning ball bearings

Photo: Self-aligning ball bearings

These ball bearings have a spherical surface with a point at which the center of the outer ring track surface matches the center of the bearing, and the inner ring has a two-row track groove.

The balls, cage, and inner ring are able to tilt freely to a degree with respect to the outer ring, and rotate. As such, misalignment caused by processing errors in the axis or housing, or by mounting of the bearing, is automatically corrected.

However, as the capacity to bear axial loads is not so great, the bearings are not suited to locations with large axial loads.

The bearings are often used in applications such as drive shafts, as mounting and un-mounting are easy if an adapter is used for bearings with tapered bore calibers.

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Ball bearings for rolling bearing units

Photo: Ball bearings for rolling bearing units

NTN uses the same steel balls and cage as used in the 62.63 deep groove ball bearing series. In addition, the units feature a double seal that combines oil-resistant synthetic rubber seals on both sides and NTN's unique slinger (also called flinger).

The products include those with a wide inner ring that is tightened to the shaft with screws having mounting balls at two locations, and those that have a tapered bore caliber surface and are mounted on the shaft using an adapter. There are also products using the off-center collar method in which the inner ring is fixed on the shaft by means of an off-center groove on the inner groove and an off-center groove on the collar, and those in which the inner ring is mounted on the shaft through interference between the inner ring and shaft, as in the deep groove ball bearing products.

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