Ball Bearings

1.Angular contact ball bearings
These types of bearings have raceways of both inner and outer rings that are displaced relative to one another in the bearing axis direction. This means that these types of bearings are designed in such a way that they can accommodate combined loads (simultaneously acting axial and radial loads). These types of bearings are available in different design styles, with shielding or seals.
hese do not only prevent contamination but also act as retainers for lubricants. These bearings are made from the following materials: ceramic hybrid materials, stainless steel, cadmium, or plastic, and maybe plated with chrome, or other materials. They can also be re-lubricated, pre-lubricated, or can feature solid lubrication. Angular contact bearings are classified further into the following subtypes:

2.Single row angular contact bearing
These types of bearings incorporate a high number of balls to provide a relatively high load carrying capacity, and they can accommodate axial loads in a single direction only. They are typically adjusted against a second bearing, and consist of non-separable rings.

3.Double row angular contact ball bearing
These bearings have a design that corresponds to two single row bearings arranged back-to-back, but where two single bearings take too much axial space. They can accommodate axial and radial loads in either direction and tilting moments.

4.Four points angular contact bearing
These types of bearings have a design that allows them to support axial loads in all directions and their carrying capacity is high. They can support a radial load that is limited for a given axial load, they are separable, and use limited axial space than double row bearings.

5.Deep groove ball bearing
These types of bearings are the most commonly used types of ball bearings. They are available in the shield, seal, and snap-ring arrangements. The dimensions of the race within these kinds of bearings closely match the dimensions of the contained ball. They also have the ability to support heavy loads. Deep groove bearings offer both axial and radial support.
However, the relative levels of such loads can’t be varied because the contact angle can’t be adjusted. Deep groove ball bearings are classified further into the following classes.

6.Single row deep groove ball bearing
These are the most common types of all bearings. They are widely used. There are circular arcs of a radius that is slightly larger than that of the balls on the raceway grooves of the inner and outer rings. To add on top of radial loads, the imposition of axial loads can be done in either direction. These types of ball bearings have a low torque, and are highly suited for applications in which high speeds and low power loss are required. To add on top of open type bearings, these bearings often have shields made of steel or installed rubber seals on one side or both sides and are pre-lubricated with grease.

7.Double row deep groove ball bearing
These types of ball bearings have a design that corresponds to single row deep groove ball bearings. They have raceway grooves that are deep and uninterrupted and have a close osculation with the balls. This enables the bearings to accommodate axial and radial loads in both directions.
Double row deep groove ball bearings perfectly fit bearing arrangements in which there is an inadequate load-carrying capacity of a single row. Double row deep groove bearings are slightly wider compared to single row bearings in the 63 and 62 series, for the same bore and outside diameter. But they have a load-carrying capacity that is considerably high. These types of ball bearings are only found as open bearings (without any seals or shields).

8.Duplex ball bearing
These types of ball bearings are formed by a combination of two angular contact bearings. The combinations that are possible include back-to-back (type DB), face-to-face (type DF) with the faces of the outer ring together, or both front faces being in the same direction (type DT).
DB and DF duplex bearings are able to take axial and radial loads in either direction. When an axial load is strong, and in one direction and the imposition of the load equally on each bearing is necessary, type DT is used.

9.Hybrid ball bearings using ceramic balls
Ceramic bearing balls can have a weight of up to 40% less than steel ones, depending on the material and size. This results in the reduction of the centrifugal loading and skidding, so hybrid ceramic ball bearings can operate 20% to 40% faster than conventional bearings. The meaning of this is that, the force exerted inwards against the ball during the spinning of the bearing, by the outer race groove is less.
This reduction in force will reduce the friction as well as the rolling resistance. The bearing is allowed to spin faster by the lighter balls, and the bearing uses less power to maintain its speed. The ceramic balls are harder as compared to the race. Ceramic hybrid ball bearings are constructed with inner and outer steel rings and ceramic is stronger than steel. But it is also stiffer, resulting in increased stresses on the rings, and hence the load capacity is decreased.

10.Miniature bearings
These are small bearings having balls as their rolling element. Miniature bearings are sometimes referred to as micro bearings or instrument bearings with inner and outer rings, snap rings, balls, and retainers. These types of bearings are utilized in industrial and medical handpieces and other precision applications. Ball bearing designs include angular, radial, thrust, and pivot.
Miniature bearings are manufactured under the standard European metric sizes under 20 millimeters. They vary from one eighth of an inch in their overall diameter to 20 millimeters in their overall size. One of the smallest sizes is a bore of 0.04 and an overall size of one eighth of an inch. Because of its unique size, this type of bearing is helpful in a broad range of applications.
Miniature bearings are designed to achieve high performance that is reliable for moderate thrust and radial loads at low operating torque. Therefore the attributes that are most important with miniature bearings are accuracy, speed, and longevity. To add on top, the silence of a bearing running at high speeds can also be of vital importance. Miniature bearings are not used in applications involving high loads, and due to the small amount of material used, stainless steel is used to produce many of the bearings.

11.Precision ball bearings
These types of bearings allow for extra fine precision and tolerance. Precision ball bearings are ideal for applications having stringent requirements for speed and guidance accuracy. Precision ball bearings are available in two main types which are angular contact bearings and deep groove bearings. Deep groove ball bearings have full shoulders on either side of the raceways of the inner and outer ring, allowing for the addition of seals or shields with ease.
These bearings are capable of handling thrust loads, radial loads, or a combination of both. They are available in multiple sizes that include miniature precision bearings, and are available with various types of cages. Deep groove bearings are extremely versatile and are found among the most widely used bearing types.
Angular contact bearings are composed of one complete ring shoulder; the other ring is not present because it is partially or totally removed. This in turn will allow them to have a larger ball, which provides greater load capacity and speed capability. There are also various cage designs that are available to meet specific high-speed requirements.
Angular contact bearings can support thrust loads or a combination of both radial and thrust loads, but they are not capable of supporting radial loads on their own. Angular contact bearings can support thrust loads in both directions when implemented face-to-face or back-to-back.