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Angular Contact Ball Bearings

Overview

NSK's comprehensive range of angular contact ball bearings has been designed to meet the ever-evolving requirements of equipment manufacturers.
Angular contact ball bearings feature a contact angle that sustains significant axial loads in one direction at the same time as radial loads.
Since an axial component is generated when radial load is applied, these bearings are typically used in pairs or multi-bearing sets.

Angular Contact Ball Bearings

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Product List

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

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

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

The structure of angular contact ball bearings produces an axial component when a radial or combined load is applied; therefore, two opposed bearings or a multi-bearing arrangement are used.
A preload is often used to increase the rigidity of single-row angular contact ball bearings, particularly in the main spindles of machine tools where high running accuracy is crucial.
Bearings with a contact angle of 30° (A) or 40° (B) typically use pressed steel, molded resin, or machined brass cages, though machined synthetic resin or specialized polyamide resin cages are used for certain applications.

Reference 1: Features of Angular Ball Bearings
Series Pressed Steel Cages Machined Brass Cages
79A5,C - 7900-7940
70A 7000-7018 7019-7040
70C - 7000-7022
72A,B 7200-7222 7224-7240
72C - 7200-7240
73A,B 7300-7320 7321-7340

Features

  1. Support both radial and axial loads
    These bearings can take radial loads and axial loads in one direction with typical contact angles of 30° or 40°.
  2. A variety of contact angles
    Larger contact angles offer greater capacity for axial loads, while smaller contact angles are better for high-speed rotation.
  3. Two opposed bearings are used, with the internal clearance adjusted. Pressed steel cages are generally used, though polyamide resin cages are typically used for high-precision bearings with contact angles under 30°.

Applications

  1. High rigidity
    Ideal for applications requiring bearing rigidity.
  2. Pumps, compressors, screw chillers, elevator hoists

Matched Angular Contact Ball Bearings

Matched Angular Contact Ball Bearings

Matched Angular Contact Ball Bearings

Matched angular contact ball bearings come in a variety of arrangment types to suit loads in a particular application.

Reference 2: Types and Features of Matched Angular Ball Bearings
Figure Arrangement Features
Back-to-back Back-to-back
(DB)
(Example)
7208 A DB

Radial loads and axial loads in both directions can be sustained.

Since the distance between the effective load centers a0 is big, this type is suitable if moments are applied.

Face-to-face Face-to-face
(DF)
(Example)
7208 B DF

Radial loads and axial loads in both directions can be sustained.

Compared with the DB Type, the distance between the effective load centers is small, so the capacity to sustain moments is inferior to the DB Type.

Tandem Tandem
(DT)
(Example)
7208 A DT

Radial loads and axial loads in one direction can be sustained. Since two bearings share the axial load, this arrangement is used when the load in one direction is heavy.

Features

  1. Flexible arrangements
    Angular ball bearing sets are defined by how the bearings are combined. Bearings can be arranged with their outer ring front faces aligned (face-to-face/DF), with their back faces aligned (back-to-back/DB), or with both in the same direction (tandem/DT).
  2. Support axial and radial loads
    DF and DB arrangements can sustain radial loads and axial loads in both directions. DT arrangements are used for large axial loads in a single direction.
  3. High precision
    Precision class (P5 or above) arrangements are often used with the main spindle of machine tools. In this case, a preload is applied based on operating conditions to adjust the internal clearance. They also use a special fit.

Applications

  1. Pumps, compressors, screw chillers, elevator hoists

Double-Row Angular Contact Ball Bearings

Double-Row Angular Contact Ball Bearings

Double-Row Angular Contact Ball Bearings

A back-to-back paired mounting of single-row angular contact ball bearings is turned into a bearing with a single inner ring and outer ring. Double-row angular contact ball bearings are often used as fixed-end bearings as they can sustain axial loads in both directions and have the capacity to take moment loads.
These bearings feature pressed steel cages.

Features

  1. Compact design
    Double-row angular contact ball bearings offer an integrated back-to-back mounting of two single-row ACBBs and are composed of a single inner ring and outer ring.
  2. Support axial loads
    Double-row ACBBs can take axial (thrust) loads in both directions.

Applications

  1. Compressors, press machines, automatic guided vehicles (AGVs), belt conveyors

Four-Point-Contact Ball Bearings

Four-Point-Contact Ball Bearings

Four-Point-Contact Ball Bearings

Four-point-contact ball bearings feature an inner ring split into two pieces. Just one of these bearings can sustain significant axial loads in both directions.
A contact angle of 35° allows for high axial load capacity. This type is suited for carrying pure axial loads or combined loads where the axial load is high.
These bearings feature machined brass cages.

Features

  1. Easy to handle
    The outer ring of these specialized single-row angular contact ball bearings can be separated from the two halves of the inner ring split along a plane perpendicular to the shaft center.
  2. High axial load capacity
    With a contact angle of 35°, four-point-contact bearings are well-suited for pure or combined loads where axial load is high.
  3. Compact
    A single bearing can be used to replace a face-to-face or back-to-back arrangement of bearings.

Applications

  1. Tractor transmissions, robot gearboxes, servomotors

FAQ

  • How can you tell angular contact ball bearings (ACBBs) apart from deep groove ball bearings (DGBBs)?
    • The thickness of the outer ring is different for the marked and unmarked sides of angular contact ball bearings. This is due to the contact angle between the outer ring and balls. The thickness of the outer ring for deep groove ball bearings is the same on both sides. Additionally, ACBBs have 7xxx designations, while DGBBs have 6xxx designations.
  • What is the difference between using an angular contact ball bearing arrangement, a double-row angular ball bearing, or two single-row angular contact ball bearings?
    • Double-row ACBBs can take axial loads in both directions, but they have limited contact angles. ACBB arrangements or multiple single-row ACBBs can only take axial load in one direction as determined by how they are combined. However, these options have no limits for contact angle, allowing for a custom selection to best match the ratio of radial load to axial load. Additionally, the clearance and precision of ACBB arrangements is controlled as a set, creating a stable level of vibration/noise and rotational accuracy. However, using two single-row ACBBs that are controlled individually can cause significant variation in their resulting properties when combined.
  • How are angular contact ball bearings unique?
    • As their name implies, the balls and outer ring in an ACBB make contact diagonally according to the contact angle. Larger contact angles increase the inclined contact made between the balls and outer ring, thereby affecting limiting speed and load capacity.

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