Amazing Tools


Tools professionals and amateurs use for home and garden improvements

What are ball bearings?


A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the inner and outer races. Ball or spherical bearings (in which the contact surfaces are curved) are typically used in applications where the misalignment angle can be up to 20 degrees, although close tolerance angular contact ball bearings offer even greater adjustability.

Ball bearings are available in a comprehensive range of sizes yet prices can vary considerably. Most bearing suppliers offer chrome-steel and stainless steel ball bearings in both imperial and metric sizes, as well as a host of other related products.

The main ball bearing types are as follows:

Angular contact ball bearings, low-friction roller bearings (causing less friction than normal bearings), and versatile SKF double direction angular contact ball bearings.

There is also a special category of super precision deep groove ball bearings, which allow virtually zero clearance to be achieved between inner and outer races even at high speeds. These super-precision bearings can accommodate shafts with keyways or non-circular holes in the bore as well as providing for angular misalignment. The range includes high speed, large diameter, shallow groove versions along with smaller capacity but higher load carrying premium models.

They consist of an inner ring with raceways that form a close fit around the shaft. You also have an outer ring that has raceways or grooves for the balls. The bearings are separated by a thin layer of lubricating oil and supported by ball bearings that fit into the inner bearing’s groove.

The main function of ball bearings is to support shafts that transmit rotational force through their centre. A major application for ball bearings is in car engines, where there may be several dozen sets supporting the rotating parts such as crankshafts or camshafts. In this type of engine design, most if not all modern automobiles use individual ‘boxed’ ball-bearings within each pair of connecting rods to allow them to pivot freely at one end while transferring power from cylinder liners (or cast pistons).

What are Barrel Roller Bearings?

A barrel roller bearing makes use of two or four curved cylindrical rollers that are installed either in pairs or in sets of four, respectively. The name is derived from the roller’s resemblance to a barrel or drum. These rollers can be made from various materials such as steel, stainless steel, brass and bronze.

These bearings make use of large cylindrical rollers that are mounted on a shaft at one end and this shaft is secured by means of a flange at the other end (see picture). Rollers within a pair alternate between inner and outer positions relative to each other, while those within sets may also alternate their position but not with respect to one another.

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