Understanding the Rear Code of NSK Bearings

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NSK bearings are known for their high precision and reliability, and understanding the rear code is essential for selecting the right bearing for your application. The rear code provides detailed information about the internal structure, materials, seals, and other specific features of the bearing. ### 1. Internal Structure - **A**: Angular contact ball bearing with a contact angle of 30 degrees. - **A5**: Angular contact ball bearing with a contact angle of 25 degrees. - **B**: Angular contact ball bearing with a contact angle of 40 degrees. - **C**: Angular contact ball bearing with a contact angle of 15 degrees. - **C**: Tapered roller bearing with a contact angle of 20 degrees. - **D**: Tapered roller bearing with a contact angle of 28 degrees. - **C, CA (with brass cage), CD (with high load spherical roller bearing).** - **E**: High-load cylindrical roller bearing. - **H**: High-load thrust spherical roller bearing. - **J**: Tapered roller bearing with a smaller outer ring diameter and standard width according to ISO standards. ### 2. Material Information - **G**: Inner and outer rings made of carburized steel. - **H**: Inner and outer rings made of stainless steel. ### 3. Cage Type - **M**: Solid copper alloy cage. - **T**: Synthetic resin cage. - **W**: Stamped steel cage. - **V**: No cage. ### 4. Seals and Dust Covers - **Z**: Single-sided dust cover. - **ZS**: Steel dust cover on one side. - **ZZ**: Steel dust cover on both sides. - **D**: Single-sided rubber seal. - **DD**: Double-sided rubber seal. - **V**: Single-sided non-contact rubber seal. - **VV**: Double-sided non-contact rubber seal. ### 5. Outer Ring Shape - **K**: Tapered bore, ratio 1:12. - **K30**: Tapered bore, ratio 1:30. - **E**: Outer ring with grooves or oil holes. - **E4**: Outer ring with oil groove and hole. - **N**: Outer ring with a stop groove on the outer diameter. - **NR**: Outer ring with a stop groove and stop ring. ### 6. Pairing and Adjustment - **DB**: Back-to-back arrangement. - **DF**: Face-to-face arrangement. - **DT**: Series arrangement. - **+K**: Outer ring with adjustment. - **+L**: Inner ring with adjustment. - **+KL**: Both inner and outer rings with adjustment. ### 7. Radial Clearance - **C1**: Smaller than C2 clearance. - **C2**: Smaller than CN clearance. - **CN**: Standard clearance. - **C3**: Larger than CN clearance. - **C4**: Larger than C3. - **C5**: Larger than C4. - **CC1**: Small cylindrical roller bearing, smaller than CC2. - **CC2**: Smaller than CN. - **CC3**: Standard clearance for cylindrical roller bearings. - **CC4**: Larger than CC3. - **CC5**: Larger than CC4. - **MC1-MC6**: Miniature ball bearings with varying radial clearances. - **CM**: Clearance for deep groove ball bearings used in motor applications. - **CT**: Clearance for cylindrical roller bearings used in motor applications. ### 8. Precision Level - **P0**: Corresponds to JIS level 0. - **P6**: Corresponds to JIS level 6. - **P6X**: Corresponds to JIS level 6X. - **P5**: Corresponds to JIS level 5. - **P4**: Corresponds to JIS level 4. - **P2**: Corresponds to JIS level 2. ### 9. Special Standards - **X26**: Temperature limit below 150°C. - **X28**: Temperature limit below 200°C. - **X29**: Temperature limit below 250°C. - **S11**: Spherical roller bearing with temperature limit below 200°C. --- **Related Articles:** - High-speed bearing installation and adjustment - Wheel bearing inspection and protection - Protection of cylindrical roller bearings - Rolling bearing measurement errors - Analysis of NSK bearing noise This article is sourced from China Bearing Network. For more information, visit [China Bearing Network](http://www.chinabearing.net). Previous: Four typical dynamic pressure bearings and their application environments Next: Bearing blanking techniques and manufacturing skills

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