Pressed steel cage, roller guided, not hardened, sometimes followed by a number to indicate different designs, such as J1

Used to indicate the wide temperature grease used in the bearing (-40 to +160°C). Different greases within this temperature range are indicated with a two-digit number following WT. Different fill quantities are indicated with a letter or a letter-number combination following WT, using the same codes as HT. For example: WT or WTF1

Modified internal design, same external dimensions. For example: 21306 C indicates a spherical roller bearing with two pressed steel window-type cages, no flanges on the inner ring, and a guide ring centered on the inner ring

Modified internal design, same external dimensions. For example: 4210 A indicates a double row deep groove ball bearing without filling slots; 3220 A indicates a double row angular contact ball bearing with a 30° contact angle

The basic bearing code consists of three parts: bearing type code, size series code, and inner diameter code. Here is a detailed description:

Bearing codeschart

1, C-type spherical roller bearing with a machined brass cage, flanges on both sides of the inner ring, and a guide ring centered on the inner ring; 2, universal matched pair bearing, with axial clearance smaller than normal group (CB)

Modified internal design, same external dimensions. For example: 7224 B indicates a single row angular contact ball bearing with a 40° contact angle; 32210 B indicates a tapered roller bearing with a larger contact angle

Bearingsize calculator

1, C-type spherical roller bearing with improved roller guiding; 2, universal matched pair bearing with axial clearance greater than normal group (CB) when arranged back-to-back or face-to-face

Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings paired in tandem

Bearing codesand sizes

1, Universal matched pair bearing with normal axial clearance when arranged back-to-back or face-to-face; 2, double row angular contact ball bearing with specific axial clearance

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Used to indicate the grease used in the bearing. The second letter indicates the temperature range of the grease, and the third letter indicates a specific type of grease.

1, C-type spherical roller bearing with improved roller guiding; 2, universal matched pair bearing with axial clearance greater than normal group (CB) when arranged back-to-back or face-to-face

Bearingnumber identification

1, C-type spherical roller bearing with a machined brass cage, flanges on both sides of the inner ring, and a guide ring centered on the inner ring; 2, universal matched pair bearing, with axial clearance smaller than normal group (CB)

For the 3D drawing, we prefer to STEP, IGS or X_T format. The maximum supported file size is 10MB, For larger or multiple files please place into one folder and compress into a ZIP or RAR file and sent to info@aubearing.com

Combination of B with a two- or three-digit number, indicating some variants with no suitable suffix. For example: B20 indicates a narrowed width tolerance

Bearingnumber and size chart pdf

A letter following V indicates a specific feature different from the standard bearing. A three- or four-digit number following V indicates its specific meaning. For example: VA: indicates a specific application; VB: dimensional differences; VE: external or internal differences; VL: coating; VQ: different quality and tolerance; VS: clearance and preload; VT: lubrication; VU: various other features

Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings paired face-to-face

Bearing with one side fitted with a steel skeleton nitrile rubber (NBR) contact seal and the other side with a pressed steel dust cover

Shifted clearance range, corresponding to the upper half of the normal group clearance range and the lower half of the C3 clearance range

Bearing codesSKF

Normal radial clearance, usually used only in combination with the following letters to indicate narrower or shifted clearance ranges

Modified internal design, same external dimensions. For example: 21306 C indicates a spherical roller bearing with two pressed steel window-type cages, no flanges on the inner ring, and a guide ring centered on the inner ring

Modified internal design, same external dimensions. For example: 4210 A indicates a double row deep groove ball bearing without filling slots; 3220 A indicates a double row angular contact ball bearing with a 30° contact angle

Bearing codespdf

Modified internal design, same external dimensions. For example: 7224 B indicates a single row angular contact ball bearing with a 40° contact angle; 32210 B indicates a tapered roller bearing with a larger contact angle

Combination of B with a two- or three-digit number, indicating some variants with no suitable suffix. For example: B20 indicates a narrowed width tolerance

Universal paired single row angular contact ball bearings, with a certain preload when arranged face-to-face or back-to-back

Bearings are key transmission components in mechanical equipment. Correctly selecting and understanding bearing model codes is crucial to the performance and life of mechanical equipment. Therefore, it is very necessary for engineers and technicians to understand and master the meaning of bearing model codes. This article will introduce the components of bearing model codes in detail, including basic codes, size codes, and prefix and suffix codes of bearings of different well-known brands, to help you better understand and apply bearing codes.

Bearing codeslist

A number following U indicates a narrowed width tolerance band, used for tapered roller bearings or their inner or outer rings. For example: U2: width tolerance +0.05/0mm; U4: width tolerance +0.10/0mm

1, Universal matched pair bearing with normal axial clearance when arranged back-to-back or face-to-face; 2, double row angular contact ball bearing with specific axial clearance