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Angular contact Ball Bearing

Available as Single or Double row, Matched Pair and Four Point Contact.

Available as Single or Double row, Matched Pair and Four Point Contact.

Designed for high accuracy and excellent high-speed performance. Angular contact ball bearings are designed to carry combined loads: both axial and radial.

Angular contact bearings are designed such that a contact angle between the races and the balls is formed when the bearing is in use. The major design characteristic of this type of bearing is that one, or both of the ring races have one shoulder relieved, or higher than the other. In order for these bearings to function properly, they must be assembled with a thrust load. This loading (or preload) creates a line of contact (or contact angle) between the inner race, the ball and the outer race. The preload can be built into the bearing or created when the bearing is inserted into an assembly. The contact angle varies from 15° to 40° and is measured relative to a line running perpendicular to the bearing axis. Angular contact bearings are unidirectional thrust bearings that can withstand heavy thrust loads and moderate radial loads.

Important dimensions to consider when searching for angular contact bearings include design units bore, outside diameters, and outer ring width.  Design units can be in either inches or metric units.  Some manufacturers may specify parts in both.  The bearing industry uses a standard number system for bearings with metric diameter bores.  For bore sizes 04 and up multiply by 5 to obtain the bore in millimeters. 

Important operating specifications to consider when searching for angular contact bearings include rated speed, static radial load, and dynamic radial load.  The rated speed of a bearing running with grease lubrication is lower than that of a bearing with oil lubrication.  The static radial load is the maximum radial load a bearing can endure without excessive permanent deformation.  The dynamic radial load is the calculated constant radial load, which a group of identical bearings with stationary outer rings can theoretically endure for a rating life of 1 million revolutions of the inner ring.

Manufacturers typically assign an ABEC rating to bearings.  ABEC (Annular Bearing Engineers' Committee) ratings classify different accuracy and tolerance ranges for bearings. The higher the ABEC number the tighter the bearing tolerances.  Please consult the tables in the search form for Angular Contact Bearings for tolerances and other rating equivalents.

Angular contact bearings can have a number of different styles of seals or shielding.  Seals and shields provide protection from contamination and serve as a retainer for lubricant.  Seals provide better protection and lubricant containment than shields, but have lower maximum speed capabilities.  The different types include single/double seal or single/double shield.  Angular contact bearings may be constructed of special materials including stainless steel, plastic, and ceramic hybrid. They may also be plated; common plating materials are cadmium and chrome.

Bearing design for angular contact bearings can be one directional thrust, double directional thrust, double row, double row maximum capacity angular, duplex thrust, and four-pointed contact.  Thin-section bearings have small cross-sections with respect to their diameter.   Bearings with ball screw support are specially designed for use in ball screw or lead screw applications.  Some bearings may also be flanged.  Angular contact bearings may have a variety of lubrication options. They can be re-lubricated, pre-lubricated, or have solid lubrication.

Angular contact ball bearings are suitable for applications which require high accuracy and good high-speed performance. This type of bearing is designed to carry a combined load.

Bearing 3D

What is an angular contact ball bearing?

An angular contact ball bearing uses axially asymmetric races. An axial load passes in a straight line through the bearing, whereas a radial load takes an oblique path that tends to want to separate the races axially. So the angle of contact on the inner race is the same as that on the outer race. Angular contact bearings better support "combined loads" (loading in both the radial and axial directions) and the contact angle of the bearing should be matched to the relative proportions of each. The larger the contact angle (typically in the range 10 to 45 degrees), the higher the axial load supported, but the lower the radial load. In high speed applications, such as turbines, jet engines, and dentistry equipment, the centrifugal forces generated by the balls changes the contact angle at the inner and outer race. Ceramics such as silicon nitride are now regularly used in such applications due to their low density (40% of steel). These materials significantly reduce centrifugal force and function well in high temperature environments. They also tend to wear in a similar way to bearing steel—rather than cracking or shattering like glass or porcelain.

Most bicycles use angular-contact bearings in the headsets because the forces on these bearings are in both the radial and axial direction.

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