Ball bearing table: numbers, sizes and markings

In our article we will show in detail online the tables and dimensions of ball bearings in millimeters according to GOST. These parts are intermediate links between rotating axes and shafts. They also take on radial or longitudinal loads and transfer them to other parts of the mechanism. With their help, rotation, rocking or regular movement with a low coefficient of friction is ensured.

Kinds

They are classified according to the type of force transmission and the design of the supporting elements (balls, rollers, needles and other complex geometric shapes). All units for this purpose are built on the rolling principle.

Ball ones are divided into:

• • radial;
• • self-centering;
• • supporting;
• • radial contact.

Roller:

• • radial and thrust with cylindrical rolling elements;
• • with conical rotating parts.

Selection of bearings according to parameters

The technical characteristics of the products are not limited to the listed values. The choice is influenced by many other data:

• • The maximum magnitude of the load by its nature and direction. Some parts can only handle radial and axial pressure, while others can handle mixed loads successfully.
• • Number of maintained revolutions per minute. The best performance here is characteristic of nodal rolling bearings.
• • Accuracy class, on which the rotation of the device, and hence the overall operation of the structure, depends.
• • Type of lubricant used (liquid, gas, etc.).
• • The moment of fatigue, that is, the maximum service life of the product.
• • Noise and vibration levels.
• • The actual dimensions, which have already been discussed earlier.

It is also important to take into account the operating conditions of the bearing, including temperature conditions, the ability to use it in water and other features. It can be difficult for the average person to decide on a specific type of support, and the selection form on the Internet is very limited and does not take into account most of the listed parameters. So it can be difficult to do without additional consultation from specialists, especially if the product is purchased to operate an expensive machine.

Registry:

Let's look at the technical parameters in more detail.

Table of seating dimensions and series of single-row radial ball bearings

This type is the most common and is used in mechanisms that have rotating parts: in electric motors, in gearboxes, in belt and chain drives of various sizes, from wristwatches to the power plants of an ocean liner.

The specific markings, table of sizes and numbers of bearings by diameter are the same for all types. They differ in technological features, level of protection and the presence of mounting grooves in the unit.

With one protective washer

The parameters and weight of these parts coincide with the data given above. The only difference for ISO is the additional letter z. For example, 6321 Z. According to GOST, the number 60 is placed in front of the number.

With two protective washers

The data for this type of nodes is the same as in the first statement. They only differ in the addition of the symbol ZZ for ISO and for GOST - the additional 80.

With one-sided seal

The parameters of these nodes coincide with the register above, with the exception of the letters in the ISO marking and the numbers in GOST. Instead of Z, RS is written, and 10 is inserted before the four-digit number.

Double sided

The data for such parts is analogous to the material given in the previous heading. Only the number 2 is inserted before RS, and 180 is written before the number.

With groove on outer ring

The ISO marking says 6003 N, according to GOST 50103.

With groove and one protective washer

Here the designations are as follows: 6003 ZN or 150103.

With groove and two protective washers

ISO – 6003 ZZN, GOST – 450103.

With double seal groove

The groove is designated by the letter N, and the seal is designated by RS or 2RS.

Pros and cons of using

The design features of parts directly affect their useful properties and disadvantages. Let's look at them separately.

Rolling

Among the undoubted advantages of this type of device are:

• • Low cost. This factor is especially relevant given that in some complex mechanisms up to several hundred support units can be used simultaneously.
• • Low friction does not lead to serious losses and strong heating. And in general, the supports behave equally well both at the start of operation and in an already established stable operating mode.
• • A wide variety does not exclude the interchangeability of parts, and easy installation allows you to make repairs quickly and efficiently.
• • For normal operation, virtually no lubricants are needed.
• • Overall, much less care and attention is required to the parts in which these products are installed.

On the downside, rolling devices are quite susceptible to shock and vibration loads due to their rigid design. This precludes their use in some machines. In terms of their dimensions, the products that provide rocking are large, and the work takes place in quite a lot of noise.

Slip

Among the advantages of use are:

• • Small size.
• • The design can be either detachable or prefabricated.
• • Performance in high-speed mechanisms is significantly better than that of other devices.
• • They are resistant to shock waves and vibrations, which increases the possibility of operation.
• • Works in the most adverse environmental conditions.

Among the disadvantages are:

• • The need for constant monitoring of the lubricant level, since without it the technical characteristics deteriorate significantly.
• • During start-up, large losses occur.
• • Efficiency is lower than in rolling bearings.
• • Expensive raw materials are used for production, which increases the overall price.
• • Components are produced unevenly, which complicates the maintenance of the entire machine as a whole.

You can search for a bearing by size online, but many other key parameters will still have to be determined additionally. With the right choice, you can ensure stable operation of the machine and reduce the need for maintenance. Sometimes it is better to seek help from professionals who will answer your questions and advise which option to choose.

Angular contact ball bearings

This type provides a reaction in two planes along the axis and perpendicular to it. When using a two-row model, the shaft is fixed in space.

Dimensions in the table of angular contact ball bearings, single-row, one-piece

Standard sizes and weights of double-row angular contact ball bearings in the table

Correct selection of bearings

Correct selection of bearing sizes directly affects the reliability of equipment. But in order to ensure long-term maintenance-free operation of the mechanisms, it is important to take into account other parameters:

• Magnitude, direction, nature of the load. Bearings of different types can accommodate radial, axial or mixed loads.
• The number of revolutions of both rings per unit time.
• Working life, expressed in working hours or number of revolutions over the entire service life. This is one of the most important parameters characterizing the durability of the mechanism.
• Features of the environment in which the bearing will be operated.

Using the bearing selection form on our website, you can select products of the size you need and compare their performance characteristics. After this, all you have to do is place an order for the desired product.

The choice of product is also influenced by specific requirements, depending on the operating characteristics of a particular unit. always helps his clients. Our specialists will advise you on any issue and help you choose the right bearing. We do everything to make cooperation with us as convenient as possible for you. If you have any questions or need additional information, just call us at 8 (812) 333-00-90 or request a call back.

The variety of types and shapes of support nodes makes it difficult to choose a specific one. You can select a bearing by size from the table online. It's actually not that difficult to decide. To do this, you need to carry out a simple procedure for measuring an existing part that needs to be replaced or use already known parameters. If you follow the rules, you can select a specific model and order its purchase without leaving your home. Let us consider in detail how to do this so as not to make mistakes when purchasing new spare parts.

Thrust ball

This series of parts is designated by two types.

Single

There are no English letters in the ISO marking, and numbers begin with 511. According to the state standard, four-digit numbers with a prefix of 81.

With backing ring

Double row thrust ball bearings

Cylindrical roller bearings

These parts compare favorably with ball parts due to the increased load on the axle. The contact area of ​​the roller is much wider than that of a spherical bearing. Some modifications allow longitudinal displacement along the axis.

We will show tables that can be used to determine the size by bearing number:

Without flanges on the outer ring

With single breasted inner ring

With one built-in and one free flange on the inner ring

Marking and dimensions according to GOST

Requirements for components and parts are formulated by GOST. Rolling bearings are described by GOST 520-2002.

The symbols are based on the following parameters:

• the diameter that the bearing bore has;
• series of widths (or heights) and series of diameters;
• types of bearings;
• technical implementation.

How to correctly determine the dimensions of rolling bearings based on the markings? The notation table will help you cope with this task.

All the above parameters are indicated by signs (or numbers).
What numbers the bearing marking consists of depends on the places they occupy in its symbol, if read from left to right: GOST for plain bearings

Tapered roller bearings

They have the same advantages as cylindrical ones: high load, the ability to disassemble. In addition, they allow you to adjust the gap between the rolling surfaces after working. These include the following types.

Single row

With a large cone angle

Double row

Four-row

Bearings are sealed on both sides

180000 – with two seals;
d - nominal diameter of the hole of the inner ring; D – nominal diameter of the outer cylindrical surface of the outer ring; B is the nominal width of the bearing. Designation according to GOST 8882-75 (ST SEV 3793-82)

Additionally designated: ball bearings with metal rings (non-contact seal) closed on both sides (additional designation 2Z) and bearings with metal-rubber seals (contact seal) (additional designation 2RS).

Compared to sealed bearings on one side, this type of bearing is more versatile and can be installed in places where there is a possibility of contamination on either side.

Spherical roller bearings

They combine the ability to withstand high loads and have a deviation in the axes of landing and rotation. They are also called self-centering.

Double-row with sides on the inner ring

With beadless inner ring

Spherical double-row with sides on the inner ring with a landing cone 1:12

Spherical double-row with sides on the inner ring with a cone 1:30

Spherical double-row with a beadless ring with a hole with a taper of 1:30

Flatbed with inner ring with seat cone 1:12

Thrust spherical single row

Types of bearing seals

Bearing seals are divided into external and built-in. The external seal is a separate part and is supplied separately. They are usually used in conjunction with large bearings that operate under harsh conditions.

Integrated seals are already part of the sealed bearing and are supplied with the bearing. There are two types: shields and rubber seals.

Contact sealing is based on the action of a thin sealing lip, which fits tightly to the contacting surface and protects against the ingress of impurities, moisture or lubricant leakage. It is installed in a groove on the outer ring and touches the inner ring with one or more edges, thereby ensuring a seal. A tight fit is ensured either by the material itself or by a spring.

Non-contact seals are installed in places where, due to lack of space or cost, non-contact seals cannot be installed. The pressed steel shield is inserted into the outer ring and creates a small gap with the inner ring without touching it, so the frictional torque is not increased. Also used where there are high heating conditions or high engine speeds.

Seals are made from stamped steel rings of simple design.

Contact seals are made of metal rubber and have a labyrinth between the sheet element and the rubber lip. Increased protection against contamination. But it is used only at medium engine speeds. Rubber jaws are standardly made of nitrile butadiene rubber with sheet steel reinforcement, the edges of which touch the recesses on the side plane of the inner rings. All sealed bearings do not require re-lubrication; they are filled with grease once during manufacture. When filled with high-quality lubricant, the bearings do not require repeated maintenance.

Plain bearings

This unit does not have rolling elements. Its characteristics are as follows: the inner and outer cages are made along the same radius. Therefore, the axis, relative to the mandrel, has several degrees of freedom. Most often they are used in articulated joints.

Plain bearings with a hole and grooves for lubrication in the inner ring with a single-break ring

With double-break outer ring

With holes and grooves in the inner ring

With grooves on inner and outer rings

Without holes and grooves with single break ring

With holes and grooves on outer and inner rings with single break ring

With double-break outer ring

Below we provide tables of closed sizes of rolling and sliding ball bearings.

Sealed bearings on one side

160000 – with one seal, d - nominal diameter of the inner ring hole;
D – nominal diameter of the outer cylindrical surface of the outer ring; B is the nominal width of the bearing. These single-row bearings are designated according to GOST 8882-75 (ST SEV 3793-82)

Additionally designated: ball bearings with metal rings (non-contact seal), closed on one side (additional designation Z) and bearings with metal-rubber seals (contact seal), closed on one side (additional designation RS).

Needle Bearing Size Chart

Plain bearings

Thrust-radial roller

Table fields

They display the names of the main parameters and their geometric dimensions.

ISO marking

It is standard for most countries of the world, which indicates the number and design features.

GOST

It is a Russian analogue and performs the same functions.

Node internal diameter

It is measured in millimeters (mm) and is designated by the English letter d.

Outside diameter

Denoted as D.

Width

Measured in mm and identified by a capital B.

Weight

The measure is in kilograms (kg).

Scheme

Explains the basic structure.

Benefits of bearings

Each type of support unit has its own unique advantages and disadvantages. But there are also common advantages, which is why their exploitation is so widespread.

Firstly, the operating time of the machine increases, since small parts take on an impressive part of the load. Accordingly, wear occurs later, and repairs are required much less frequently. Secondly, with the help of these products it is easy to increase the accuracy of certain parts of the structure. Thirdly, servicing the mechanism requires less effort, time and money. And finally, they are able to expand the functionality of the equipment in which they are built.

Product sizing

In everyday life or production, these parameters are measured with certain tools: calipers, micrometers, bore gauges.

External Diameter Measurement

Manufacturing parameters are maintained quite accurately. Therefore, you should not trust the readings of a caliper. If it shows a non-standard value, then the real data will be the closest indicators indicated in the register.

How to measure the inner diameter of a product

Construction stores sell a special device called a bore gauge. But it is better to take the closest number from the classic report card as the true value.

Sliding: performance characteristics, advantages and disadvantages

Their design is different from rolling because in fact the two main parts (rings) do not roll on rollers, but slide against each other. The result is an increased area of ​​friction, which consequently makes this force much greater. This is the main disadvantage that is attached to the product. If there is not enough lubricant, the metal will heat up, which can lead to failure.

Let's consider the advantages and disadvantages of the product.

Pros:

• At high rotation speeds they are very reliable, so they are used for turbines, aircraft construction and other important areas. This is ensured by the fact that the rolling body (ball) cannot jump out of the system at high speeds. In fact, this is a very primitive design, and the simpler it is, the fewer malfunctions can occur.
• The large area of ​​the contacting surface leads to the fact that vibrations have little effect on it. This is also ensured by a dense layer of oil. This layer makes any shocks and vibration interference virtually unnoticeable.
• Small radial dimensions.
• It fits perfectly with the crankshaft, attaches to its journal and transmits torque.

There are also disadvantages:

• It loses in the classification of bearings by type of friction, because the mechanism rubs a lot, especially during start-up or low speeds. The metal heats up, its qualities are lost, and it may begin to crack or wear off.
• Wear is higher than that of the rolling unit, replacement is required more often.
• To function, the lubricant must be constantly replenished. This can be either automatic or manual.

Performance characteristics and structure

The inner sleeve, that is, a ring of smaller diameter, is usually created from a material with anti-friction properties. They have a low coefficient of friction, which partially eliminates the problem of all sliding mechanisms. The body is made of steel. It fits tightly onto the bushing. The small gap between them is intended to allow lubricant to flow there. The system assumes automatic feeding. The layer of this liquid is determined depending on pressure, temperature and actual flow.

Based on the type of sliding bearings and their application, the degree of friction can be determined:

• dry;
• borderline;
• hydrodynamic;
• gas-dynamic.

The first ones are most susceptible to rapid wear. It should also be taken into account that during a number of actions, for example, when starting or turning off, during slow rotation, all products belong to the second type, that is, they are at their maximum capabilities.

The durability of the unit is affected not only by operating conditions, but also by the nature of the lubricant used. Its functions are as follows:

• cooling, because when moving, heat is generated, and if there is excess heat, all nearby metal parts can be damaged;
• removal of friction force;
• protection of the part from external influences - not only dust particles and other contaminants, but also moisture can have a negative impact;
• rust prevention.

Another classification is based on the types of thrust sliding bearings based on the lubricant used. It can be dry, classic wet, gas or plastic. The most innovative development is the use of porous metal. This material has pores. It is as if impregnated with a dry substance, which changes its state of aggregation when heated. From the first movements, when the structure heats up, liquid begins to ooze out of small holes in the metal casing or in the bushing. After work, cooling occurs, and at the same time the lubricant returns to a powdery state.

Let's look at the product image:

But the proposed structure with a powder that changes its properties when heated is rather an exception to the rule. This is a difficult device that requires the use of expensive materials. Two other subspecies are considered classics. Types of plain bearings and their purpose, application, depending on the supply of lubricant:

• hydrostatic - it is necessary to maintain the liquid level from the outside, the mechanism receives a request for a low amount of liquid, this is implemented by other structures;
• hydrodynamic - more modern and original, their distinctive feature is that they themselves control the pressure as they rotate, when it becomes lower than it should be, the pump automatically fires, the container supplied from the outside begins to compress, transferring the required amount of lubricant.

And the last classification is the definition of design features. The body can rotate around different bushings. Bearings can be:

• Spherical. The sphere inside has significant deviations from the plane, so skew during movement is allowed. But the effectiveness will be confirmed only at low speeds. If you are tall, you definitely need strong support.
• Persistent. They only support axial loads.
• Linear. This type of bearing is installed in fans and other systems where classic circular rotation is required.

Now let's look at less general product classifications.