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.

Bearing designation

Bearing symbols are applied to the ends of the rings by stamping, etching or electric spark method. On the outer surface of the outer ring - electrochemical etching. See more about bearing marking methods.

In some cases, the symbol on the rings is not applied to miniature and precision bearings. They are recorded in the accompanying documentation and on the packaging.

A wide range of assemblies are found in stores and factories. Each of them is designed for its own task, meets a number of requirements, and is also suitable in size for the specified spare parts. In the article we will give a breakdown of the symbols and bearing numbers.

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

How does a thrust ball bearing work?

The main elements of thrust ball bearings are rings, balls and cages. A single unit consists of two rings - tight and loose, between which the rolling elements are placed, fixed in the cage. The tight ring is pressed onto the mechanism shaft, and the loose ring is installed in the housing. Each ball of the part is located in a separate separator socket, stamped or cast, which ensures that they maintain their structural position during operation. A double thrust bearing also cannot take a radial load, but can be used where force acts on both sides. This type of support has three rings - one of which is tight and two are loose. The balls are located on opposite sides of the tight ring, due to which the assembly works with persistently oriented forces in both directions. Both single-row and double-row bearings for axial loads are made dismountable for the most convenient installation and maintenance.

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

Designation of conical rollers GOST

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

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.

A wide range of assemblies are found in stores and factories. Each of them is designed for its own task, meets a number of requirements, and is also suitable in size for the specified spare parts. In the article we will give a breakdown of the symbols and bearing numbers.

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

GOST designation of spherical rollers

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

Additional designations

There are two categories:

• prefix;
• suffix.

Let's start with the console. It is located in front of the digital code and is compiled according to the rules:

• recording starts on the right;
• missing positions are discarded, and if there is absolutely nothing to write in the addition, then there is no need for dashes separating parts of the encoding.

Let's look at the components from right to left:

1. Accuracy class. The highest abbreviations include “5”, “4”, “T” and “2”. A little worse – “0”, “6”, “6X”, the rest show that the indicator is very bad. Then the product can be considered low quality. This happens when the ratio of all elements is not precisely adjusted. Since bearings are marked after they are manufactured, if an error is found, a bad prefix is ​​indicated.
2. Radial clearance. Classified on a scale from 0 to 9, measured in tenths of a millimeter and shows the distance between the balls, that is, between the rolling elements. Median values ​​are considered optimal. The normal indicator may not appear in any way in the recording.
3. Friction moment series. The main, frequently used group includes 1, 4 and 7. The rest must be verified according to the document RD VNIPP.021-01.
4. Category A, B or C. The latter is standard, it has no special requirements, so it is often not even indicated. But if you are dealing with A or B, then there will be digital values ​​next to them indicating the class.

On the right, in the suffix, there is optional but important information about additional instructions. It is usually needed by those who deal with non-standard models. Indicated in Cyrillic letters. The request can be made in a whole system of standardized lists: GOSTs 5721, 24696, 24850 and 7872.

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.

Designation system according to GOST

We have provided a detailed explanation about the internal size and symbols of rolling bearings. But in marking ball parts, the 2nd recording position plays an important role - a series of diameters. They are indicated according to the table:

But if there is no indication of the tire series, then 0 will also appear here. Additional characteristics are indicated by the following signs in this place:

• 7 – non-standard external size;
• 8 – non-classical width;
• 9 – non-normalized radius of the inner circle.

But in addition to the main core, according to GOST requirements, there are also designations given in the extreme right and left parts of the marking of sealed bearings. Let's look at these rules.

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.

Basic digital markings and diagram

The main thing you need to find out from the seller is which country manufactured the products. The fact is that the accepted norms and standards of Russian and foreign manufacturers differ. For the former, a domestic quality mark is prescribed - GOST 3189-89. It is always observed, this is strictly monitored by supervisory services, since failure to comply with production requirements threatens not only a discrepancy between the order (and it may be a state order) and the final result, but also emergency situations in production.

This part is one of the very important components in virtually every device where mechanical rotational movements are important. Significant damage is usually associated with its deformation. Therefore, you can be sure that when you buy bearings with numbering, you can completely rely on it.

First, we will consider domestic products, since they are more accessible and quite reliable, therefore they are used more often. They look something like this:

Y – XXXXXX – Z

Any number has three components:

• Core (X). Located in the center, it represents a database with basic data about the part. Expressed only in numbers. Six characters represent five indicators. There are hyphens on both sides.
• Prefix (Y). From the name it is clear that this is a preposition, that is, there is an identification mark at the very beginning. Can combine various sign systems. Expresses three interrelated meanings.
• Suffix (Z). Completes the combination and contains a lot of information. Consists mainly of letters of the Cyrillic alphabet (according to Russian GOST), but can be specified with numbers.

Here is a diagram with a breakdown of the markings of rolling bearings (its core)

Х(5) ХХ(4) Х(3) 0Х(2) Х(1)

where by numbers we mean:

1. hole diameter - about this in more detail below;
2. series size, that is, dimensions - multiplied coordinates and their values;
3. node type - from 0 to 9, but the entire list below will be presented in the form of a table, because without it it is difficult to remember this classification;
4. product design - a lot of codes are given for this category, up to 99 pieces, we will not list them in detail, but we will point out that the full list is in the document GOST 3395-89;
5. dimensional category - the very initial number is responsible for a series of widths or heights, highly depends on the radii and cannot always be entered, especially when this indicator is non-standard.

The main difficulties arise when we talk about the size of the inner ring. What if it is larger than 9 mm? After all, only one figure is allocated for this indicator. But what if, on the contrary, the radius is so small that multiplied by 2 it does not even reach the minimum unit to fill the indicated cell of the number? Let's look at it below.

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.

Advantages and disadvantages of ball single-row radial bearings

The undeniable advantages of radial single-row ball bearings include their high speed characteristics. These supports have proven themselves to be excellent in mechanisms with high shaft rotation speeds. Consumers are also attracted by the moderate price of these parts, due to the relatively simple production technology, as well as the ability to choose the size and design from a variety of proposed options. But these products also have a number of important disadvantages: • Bearings using a ball do not tolerate moment loads well; • Single-row type of supports does not have sufficient axial rigidity; • The carrying capacity of the products is limited; • Susceptibility to pollution; • The supports do not withstand vibrations and shocks well. In some cases, a double-row bearing, which is stiffer and more load-bearing, helps out. But, if the operating conditions of the unit are quite severe and there are doubts about the reliability of the ball design, experts recommend using roller models, the internal diameter and external size of which correspond to the parameters of radial rolling bearings with balls.