The Naming and Basic Code of SKF Bearings

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SKF bearings are identified by a unique naming system that combines a root code with additional elements to describe their design, dimensions, and special features. The root code is the core part of the bearing's name, indicating the type, basic structure, and key dimensions. Additional codes, known as supplementary codes, provide more specific details about variations in design or performance. The basic code of an SKF bearing typically consists of three, four, or five digits, sometimes including letters. The first digit or letter indicates the bearing type, followed by two digits representing the ISO series (width and diameter). The final two digits represent the bore size, which is multiplied by 5 to get the inner diameter in millimeters. However, there are exceptions: 1. In some cases, the type code and series numbers may be omitted. For example: 6(0)208-2Z (0)3209 A. 2. Bearings with an inner diameter of 10 mm or larger, or 500 mm or larger, often have the inner diameter directly indicated in millimeters, without coding. For example: 618/8 (d = 8 mm) or 618/530 MA (d = 530 mm). 3. Bearings with inner diameters of 10, 12, 15, and 17 mm use specific codes: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm, 03 = 17 mm. 4. Smaller bearings with an inner diameter less than 10 mm, such as deep groove ball bearings, self-aligning bearings, and angular contact ball bearings, may show the actual diameter in millimeters directly. For example: 629 or 129 (d = 9 mm). 5. Bearings with non-standard inner diameters are marked with exact measurements in millimeters, separated from the basic code by a slash. For example: 6202/15;875 (d = 15;875 mm). Here are some common SKF bearing types: - **Class 0**: Double-row angular contact ball bearings (often omitted). Example: (0)3204 A - **Class 1**: Self-aligning ball bearings. Example: 1201 ETN9 - **Class 2**: Spherical roller bearings and spherical roller thrust bearings. Example: 22209 E, 29328 E - **Class 3**: Tapered roller bearings. Example: 32016 X/Q - **Class 4**: Double-row deep groove ball bearings. Example: 4206 ATN9 - **Class 5**: Thrust ball bearings. Example: 51100 - **Class 6**: Deep groove ball bearings. Example: 6213-2Z - **Class 7**: Angular contact ball bearings. Example: 7305 BECBM - **Class 8**: Cylindrical roller thrust bearings. Example: 81111 TN - **Class N**: Second or third letter in cylindrical roller bearings, indicating flange configuration. Examples: NJ, NU, NUP. Multi-row bearings are always denoted as NN. Example: NU 2317 ECJ - **Class C**: CARB bearings. Example: C 2205 - **QJ Class**: Four-point contact ball bearings. Example: QJ 217 MA These bearings are designed for high-temperature environments and can also be used in low-speed, heavy-duty applications where resistance to water and chemicals is required.

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**Related Bearing Knowledge** How to choose SKF low-noise bearings • Joint bearings • Characteristics of bearing oscillation and temperature • How to assess bearing smoothness • Fullers pump discharge end bearing heat analysis and solutions This article links to http:// Please indicate the bearing network http://

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