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Bearing Hardness Definition

Bearing Hardness Definition
September 20, 2022

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Bearing hardness is the resistance to indentation, or scratch, of a solid surface by another harder surface. The area of contact between the two surfaces is called the bearing area. A small force, called bearing load, must be applied to maintain this contact. This is because the hardness of the bearing material results in high compressive and tensile stresses that resist dislocation motion. As a result, the applied load is not transmitted directly to the mechanical components below the bearing surface. Bearing hardness is expressed as a number; for example, 30 Rockwell C (RC). This value indicates how many points on the Rockwell scale a material comes from being perfectly hard (100 RC). The higher this number, the harder it is to scratch.

Bearing hardness refers to the ability of the bearing material to withstand pressure.

The surface hardness is measured by indentation, and the average hardness of a certain area is measured by taking a series of measurements in different directions.

The hardness value for different materials is different. For example, brass has a higher hardness than aluminum, but if pressed at the same time, it will deform more easily than aluminum.

Bearing materials are divided into three categories: hardened steel ball bearings (including single-row bearings and double-row bearings), nylon and ceramic bearings (including single-row bearings and double-row bearings).

Bearing steel balls are made from high carbon steels with hardenability and good wear resistance; they are used in high-speed and high-load applications requiring high accuracy when rotating. Nylon bearings have high temperature resistance, low noise and vibration characteristics, good shock absorption properties and excellent lubricity; they are mainly used in low-speed or medium speed applications with heavy load requirements; their main advantages are long service life, low cost and easy maintenance. Ceramic bearings have higher thermal conductivity than steel balls, which means that they can be used at higher temperatures without losing their performance.

There are three methods for determining bearing hardness.

The first is the Brinell hardness test. This test uses a hardened steel ball to press into the surface of the bearing material. The harder it is pressed, the deeper it will go into the bearing material; and a reading can be taken from how deep the ball has gone in.

The second method of testing bearing hardness is using a Vickers hardness tester. This machine uses a diamond tip which is pressed onto the surface of the bearing material to determine its hardness level. The Vickers test is considered more accurate than the Brinell test because it measures different angles of indentation rather than just one point on the surface.

Lastly there’s Rockwell Hardness Testing which uses an adjustable press to push down on your part at different angles until it breaks (or doesn’t).

Bearing hardness is one of the factors affecting bearing performance.

Hardness is a measure of the resistance of a material to permanent deformation. Hardness is commonly measured using the Mohs scale of mineral hardness, which ranks minerals from 1 (softest) to 10 (hardest). A diamond with a hardness of 10 would scratch any other gemstone. Quartz has a hardness of 7.0, making it easy to scratch glass (5.0), but much harder than many minerals including topaz (8.0).

Bearing hardness is one of the factors affecting bearing performance. The hardness of the rolling element surface will affect its wear resistance and also its ability to deform under load, which can cause fretting wear between adjacent rolling elements or raceways and ball-shaped or flat spots on the raceway surface.

For example, if you have an application where there are large angular changes in load direction, such as in a jack shaft application with no intermediate shaft support bearings, then you may find that ball-shaped spots form on the raceway surfaces due to this changing angular load direction.

There are many factors that affect bearing hardness.

The main factors affecting bearing hardness are material, size and speed.


The material of the bearing has a direct effect on its hardness. For example, steel bearings have a lower hardness than those made of nylon or ceramic.


The size of the bearing is also a factor in determining its hardness. Smaller bearings are usually harder than larger ones because they have less surface area touching the shaft and housing, resulting in less friction. Also, large bearings tend to be more flexible due to their size, which increases friction.


Bearing speed also affects their hardness levels. The faster the rotational speed of the shaft, the harder it becomes for the bearing to stay attached to it.

Different bearings have different levels of hardness.

There are many different kinds of bearings. Ball bearings, roller bearings and spherical roller bearings are some common types of bearings.

Different bearings have different levels of hardness. The hardness of a bearing is measured on the Rockwell Hardness scale, which uses a number to indicate how hard or soft a material is. Most ball and roller bearings fall into the range of 60 to 65 HRC (Rockwell Hardness C). A lower number indicates softer materials and higher numbers indicate harder ones.

The hardness level of a bearing determines how well it can handle high-speed rotation without wearing out prematurely. Bearings that rotate fast need more rigid surfaces than those that rotate slowly and therefore need less hardness in their construction; this also makes them less expensive as well as lighter weight.

High hardness bearing material can prolong the service life of the bearing.

The hardness of the bearing is directly related to its wear resistance and load carrying capacity.

High hardness is not only a symbol of high quality, but also a guarantee of high performance.The higher the hardness, the better the wear resistance, but there is a limit to increasing hardness due to internal friction and other factors. In addition, there will be more noise when operating at high speeds because of increased vibration and noise generation.

Since the bearing is usually used in rotating parts with high load and high speed (such as shafts and gears), it should have both high wear resistance and low noise characteristics.

Bearing hardness value is a method of describing how hard the surface of a material is. Bearings are constantly rotating around the shaft they connect to, and they need an even surface to do so.