Bearing Suffix Conclusion

/..: Standardized rolling bearings with uncoded inner diameters A: Single row angular contact ball bearing with 30° contact angle AC: Single row angular contact ball bearing with 25° contact angle ACD: Single row angular contact ball bearing, optimised internal design, 25° contact angle ADA: Double row full complement cylindrical roller bearing with wide snap ring grooves in outer ring, two inner ring halves held together by U-shaped retaining ring AS: Needle roller bearing with lubrication hole(s) in outer ring. A figure following the AS indicates the number of holes ASR: Needle roller bearing with annular groove and lubrication hole(s) in outer ring. A figure following the ASR indicates the number of holes Axx(x): A combined with a two or three-figure number identifies variants of the standard design, which cannot be identified by generally applicable suffixes B: Deviating or modified internal design with same boundary dimensions. As a rule the significance of the letter is bound to the particular bearing or bearing series Examples: 7210 B Single row angular contact ball bearing with 40° contact angle 32210 B Taper roller bearing with steep contact angle (steeper than 32210) BE: Single row angular contact ball bearing with 40° contact angle and optimised…

Bearings Don’t Like Particles
Bearing knowledge / 2020-03-09

The performance of ball bearings can be critically affected by minute particles. Particles as small as 0.005mm can cause problems. To prevent such problems, we use a class 1,000 clean room throughout our bearing assembly operation. “Keeping bearings clean” is the most important rule of bearing use. Avoid exposing bearings to any environment where particles may be present. Once inside a bearing, such particles can cause raceway scratches, abrasion and shortened life. They can also generate acoustic noise and vibration. We use shields or seals to keep particles out. But there is still a gap between the shield and inner ring of shields and non-contact seals. This gap may permit particle entry. So it is important to observe the following procedures carefully. 1. Keep your bearing handling area as clean as possible. 2. Do not remove the bearings from their packaging until just before use. If you move the bearings to a container, be sure the container is clean. Its lid should be kept closed and it should be cleaned every day to prevent particle accumulation. 3. Never use a bearing that has been dropped. It may be brinelled (race track dented). In use, a brinelled bearing will generate a…

Gearboxes

Gearboxes are used in a very wide range of industrial fields. Thanks to the use of gearboxes, a small rotation force (torque) can be used to produce a much greater rotation force, and a slow rate of revolution can be speeded up. In many industries, the gearbox, which is the equipment that transmits mechanical power, is an essential piece of equipment. This step-up unit is the: heart of a wind turbine transmission in an automobile the reduction gears in a Ferris wheel By supplying bearings for gearboxes such as these in support of their most important function: “revolving,” we believe that it can even be said to be supporting the world. However, because there are many instances where the breakdown of a gearbox would have serious implications, extremely high reliability is demanded. Naturally, we seek to ensure that its designs closely match customer needs, and the company is always aiming to enhance product quality. We supply bearings that offer long life to reduce equipment maintenance costs, can handle high load capacities, and are extremely reliable. We will continue to pool our comprehensive strengths. With environmental issues firmly in its sights, our company will continue product development efforts so that it…

Bearings with black oxide finish – Increased performance in critical applications

At this year’s Hannover Messe in Germany, bearing manufacturer NKE Austria GmbH presents bearings with black oxide finish. The protective layer improves run-in and wear characteristics and protects against environmental effects. Especially in critical applications such as wind turbine gear boxes, black oxide finish is a cost-effective and technically viable means of prolonging the service life and performance of rolling bearings. The black oxide finish forms a protective layer for steel parts. In a multistage chemical process, the surface layer of the treated parts is converted into a 1 to 2 micrometer thin mixed ferrous oxide layer that causes the characteristic black appearance. Black oxide finished bearing components feature a set of special technical characteristics, especially in the case of components that move relative to each other. Multiple protective effects can be achieved if only one functional element (typically the rolling elements) is treated. For best effect, however, all functional surfaces of a rolling element bearing, including the inner and outer ring as well as the rolling elements, should be black oxide finished. Black oxide finishing is already an established method in other industries. NKE uses this technology to further improve the technical properties of rolling bearings. The method has…

How to prevent bearing from corrosion

Stainless steel and chrome steel are normally corrosion-resistant, not easy to rust. However, improper storage or handling at high humidity, condensation environment will reduce bearing life. How does the corrosion of bearings happen? If the bearing is prolonged exposure to water can cause rust. With the passage of time can cause peeling and crack formation, which are premature bearing failures. In addition, if the bearing is too loose or improper installated, contact corrosion will occur.. Bearing corrosion will reduce the machine performance and productivity, increasing the cost of operation. Common raceway corrosions include, bearing contact corrosion, corrosion of the outer surface and the inner ring of holes. How to prevent bearing corrosion? Prevention is the main thing. Here are some methods which can prevent bearing corrosion Use waterproof grease, it can form a protective barrier in the wet environment Add some protective coatings, such as chrome, nickel, zinc Adjust bearing, if it is suspected of contact corrosion Try to use a different material, in extremely corrosive environment, you can use ceramic bearings for example.

Needle roller bearings

Most rolling-element bearings are either ball or roller bearings. The roller bearing family consists basically of cylindrical, tapered, spherical, and needle bearings. Needle roller bearings are the smallest and lightest of the roller bearing family. That gives them specific advantages for certain applications, particularly those requiring reduced weight and space. The high roller length-to-diameter ratio helped give the bearings their name as well as their operating characteristics. Essentially, needle roller bearings have: • Higher load capacity than single-row ball or roller bearings of comparable OD.• The ability to handle a larger, more rigid shaft in a given application.• Excellent rolling characteristics within a small cross section.• Generally lower cost, especially for the drawn-cup type compared with machined versions. Needle rollers The most economical type of needle roller bearing is a full-complement of loose needle rollers assembled directly between a hardened and ground shaft and housing. Generally, hardened end washers provide axial location. This type appears in many applications such as those where a hardened and ground gear bore serves as the outer raceway. When application requirements are met and assembly is not difficult, a full complement of rollers forms a bearing of small cross section and high load capacity. It…

Heat Treatment of Bearing Steels

When bearing steels are in their soft (unhardened) state, metallurgists refer to their structure as being in the pearlite state. In order to harden the steel it must be heated to a very high temperature and then cooled very rapidly. When heated in the heat treat furnace to 1,750°F, the structure transforms from pearlite to what is known as austenite. After quenching (very rapid cooling), the structure then transforms from austenite to martensite. Once transformed to martensite, the steel becomes very hard. However, at this point it is not considered “thermally stabilized”. This is because not all of the austenite transforms into martensite during the quenching process. This phenomenon is called “retained “austenite”. If the steel is not thermally stabilized, the retained austenite will over an extended period of time (possibly years) transform into martensite. This transformation is accompanied by an increase in volume that is called metallurgical growth (not to be confused with thermal growth). Metallurgical Growth will cause a change in dimension and form of any steel parts such as bearings’ even at room temperature. While not a problem with low precision commodity type bearings, in high precision (ABEC 5P, 7P, 9P) miniature bearings this lack of dimensional…

Service Life of Spherical Plain Bearings

In our previous blog entry, we examined static and dynamic load ratings for spherical plain bearings. This week, we continue our look into this bearing segment with some further information on the operating life of spherical plain bearings, and factors which can shorten or extend their use. The service life of a spherical plain bearing operated under mixed or dry friction conditions is determined by the increase in bearing clearance or bearing friction caused by progressive wear of the sliding surfaces, plastic deformation of the sliding material, or fatigue of the sliding surface. Depending on the application, the permissible wear or permissible increase in friction will be different. This means that under the same operating conditions the service life which can be obtained in practice will be different. The service life of a spherical plain bearing is the number of oscillating movements, or the number of operating hours, which the bearing will service before a defined increase in bearing clearance or a defined increase in friction is reached. The effective service life is that life which will be attained by a given spherical plain bearing under actual operating conditions. It is determined by the magnitude and type of load, but also by…

Bearing FAQs

We have assembled a wide variety of frequently asked questions (FAQs) about bearings (e.g. ball bearings, roller bearings, plain bearings, linear bearings) and bearing related products (and bearing services too). Just refer to the question you’re interested in below and you will be taken to a remarkably succinct, straight-forward, and accurate answer: Q1: Can bearings be refurbished? Yes, but it depends… Generally speaking, for small bearings it is uneconomical to attempt to refurbish a bearing product. However, for larger size bearings (6 inch bore and above) there potentially could be economic gains. In particular, bearings such as slewing rings, cylindrical roller bearings, and spherical roller bearings are candidates for refurbishing. But beyond the accumulated wear there are many other factors involved in this financial decision including maintenance cycles, lubrication, MTBF, environmental considerations and more. Q2: What’s The Difference Between Bearing Seals And Shields? Seals and shields are both in place to keep contaminants out of a bearing. In order of effectiveness, the enclosures that are offered are as follows: metal shields, rubber non-contact seals, Teflon non-contact seals, and rubber contact seals. Not surprisingly, as the sealing performance is increased, the torque required to turn the bearing will also increase due…

Bearing rings and rolling elements materials

1) High carbon chromium bearing steel High carbon chromium bearing steel specified in JIS is used as a general material in bearing rings (inner rings, outer rings) and rolling elements (balls, rollers).Their chemical composition classified by steel type is given in “Table 13-1 Chemical composition of high carbon chromium bearing steel”.Among these steel types, SUJ 2 is generally used. SUJ 3, which contains additional Mn and Si, possesses high hardenability and is commonly used for thick section bearings.SUJ 5 has increased hardenability, because it was developed by adding Mo to SUJ 3.For small and medium size bearings, SUJ 2 and SUJ 3 are used, and for large size and extra-large size bearings with thick sections, SUJ 5 is widely used.Generally, these materials are processed into the specified shape and then undergo hardening and annealing treatment until they attain a hardness of 57 to 64 HRC. 2) Case carburizing bearing steel (case hardened steel) When a bearing receives heavy impact loads, the surface of the bearing should be hard and the inside soft.Such materials should possess a proper amount of carbon, dense structure, and carburizing case depth on their surface, while having proper hardness and fine structure internally.For this purpose, chromium steel…