The suffix and prefix are separated from the rest of the designation number by a hyphen, space, or an oblique stroke. Figure 2 shows the bearing part number as S 1 27 02 2, decoded as follows:

Bearingnumber identification

The designation of a roller bearing part number consists of a basic number, surrounded by auxiliary codes- suffixes and prefixes, which describe the internal clearance, tolerance, and other design parameters.

Bearingnumber meaning pdf

If the diameter of the bore is greater than 20mm, multiply the bore diameter (which is given as a two-digit code DE) with 5 to get the actual bore diameter in mm. For bore diameters less than this value, use the code identifications in Table 1.

Bearingnumber List

Bearings support mechanical rotating bodies, thus reducing their coefficient of friction during movement and ensuring better accuracy of rotation. Bearings are used in a wide range of mechanical applications and adhere to standardized designs and international regulations. International bodies like ISO and ANSI regulate a portion of bearing’s regulations, leaving innovation space for manufacturers and a chance to develop unique designs that are specifically devised to help distinguish themselves from other producers.

The width and the outer diameter (BC) are internationally standardized, also referred to as the dimensional series of the bearing. The dimensional series (BC), together with the bearing type (A), is referred to as the bearing series symbol (ABC).

The individual parts of a bearing part number can be compared against the values given in the tables below to get adequate information about the bearing being used.

As an example, the typical bearing part numbering will look like 'A BC DE.' Consider an example shown in Figure 2. The overall bearing designation looks like Prefix A BC DE suffix.

Prefixes are used to define the variations or components of a bearing. Suffixes indicate design parameters like bearing external or internal design (seals, snap ring groove), materials and heat treatment, cage design, and clearance. Tables 3-5 show common prefixes and suffixes used in roller bearing designations.