Understanding the Rear Code of NSK Bearings

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NSK bearings are widely used in various mechanical applications, and understanding their rear code is essential for selecting the right bearing. The rear code provides detailed information about the bearing’s design, materials, and performance characteristics. **1. Internal Structure:** - A: Angular contact ball bearing with a 30° contact angle. - A5: Angular contact ball bearing with a 25° contact angle. - B: Angular contact ball bearing with a 40° contact angle. - C: Angular contact ball bearing with a 15° contact angle. - C: Tapered roller bearing with a 20° contact angle. - D: Tapered roller bearing with a 28° contact angle. - C (or CD): High-load spherical roller bearing with a brass cage. - 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. Materials:** - 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 Shields:** - Z: One-sided steel dust cover. - ZZ: Two-sided steel dust cover. - DS: One-sided rubber seal. - DD: Two-sided rubber seal. - V: One-sided non-contact rubber seal. - VV: Two-sided non-contact rubber seal. **5. Outer Ring Shape:** - K: Tapered bore with a 1:12 taper. - K30: Tapered bore with a 1:30 taper. - E: Outer ring with grooves or oil holes. - E4: Outer ring with an oil groove and oil hole. - N: Outer ring with a stop groove. - NR: Outer ring with a stop groove and retaining ring. **6. Assembly and Clearance:** - DB: Back-to-back arrangement. - DF: Face-to-face arrangement. - DT: Series arrangement. - +K: Outer ring with a spacer. - +L: Inner ring with a spacer. - +KL: Both inner and outer rings with spacers. **7. Radial Clearance:** - C1: Smaller than C2 clearance. - C2: Smaller than CN clearance. - CN: Standard radial clearance. - C3: Larger than CN clearance. - C4: Larger than C3 clearance. - C5: Larger than C4 clearance. - CC1: Smaller than CC2 clearance for cylindrical roller bearings. - CC2: Smaller than CN clearance. - CC3: Standard clearance for cylindrical roller bearings. - CC4: Larger than CC3 clearance. - CC5: Larger than CC4 clearance. - MC1: Smaller than MC2 clearance for miniature ball bearings. - MC2: Smaller than MC3 clearance. - MC3: Standard clearance for miniature ball bearings. - MC4: Larger than MC3 clearance. - MC5: Larger than MC4 clearance. - MC6: Larger than MC5 clearance. - CM: Radial clearance for deep groove ball bearings used in motor applications. - CT: Radial clearance for cylindrical roller bearings used in motor applications. **8. Precision Levels:** - P0: Corresponds to JIS level 0 (standard). - 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: Suitable for temperatures below 150°C. - X28: Suitable for temperatures below 200°C. - X29: Suitable for temperatures below 250°C. - S11: Spherical roller bearing suitable for temperatures below 200°C.

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**Related Bearing Knowledge:** - High-speed bearing installation and adjustment - Wheel bearing inspection and protection - Cylindrical roller bearing usage and characteristics - Rolling bearing measurement errors - Analysis of NSK bearing noise This article is sourced from China Bearing Network. Please visit [China Bearing Network](http://) for more information. Previous: Four Typical Hydrodynamic Bearings and Their Application Environments Next: Bearing Blank Cutting Techniques

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