Japan Seiko NSK Imported Bearing Rear Code Explanation

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This article provides an in-depth explanation of the rear code system used by Japan Seiko NSK imported bearings. Understanding these codes is essential for identifying and selecting the correct bearing type based on specific application requirements. The rear code typically describes the internal structure, materials, cage type, sealing, clearance, tolerance, and other special features of a bearing. Here's a detailed breakdown: 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, CA (brass solid cage), CD (stamped cage): High-load spherical roller bearings. - E: High-load cylindrical roller bearings. - H: High-load thrust spherical roller bearings. - J: Small diameter outer ring raceway of tapered roller bearings. 2. **Material Information** - : 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 cage. - V: No cage. 4. **Sealing and Dust Cover** - Z: Single side steel dust cover. - ZZ: Double side steel dust cover. - D: Single side rubber seal. - DD: Double side rubber seal. - V: Single side non-contact rubber seal. - VV: Double side non-contact rubber seal. 5. **Ferrule Shape** - K: Tapered bore, 1:12 taper. - K30: Tapered bore, 1:30 taper. - E: Outer ring with groove or oil hole. - E4: Outer ring with oil groove and oil hole. - N: Outer ring with stop groove. - NR: Outer ring with stop groove and stop ring. 6. **Mounting and Clearance** - DB: Back-to-back mounting. - DF: Face-to-face mounting. - DT: Tandem mounting. - +K: Outer ring with padding. - +L: Inner ring with padding. - +KL: Both inner and outer rings with padding. 7. **Radial Clearance** - C1: Smaller than C2. - C2: Smaller than CN. - CN: Standard clearance. - C3: Larger than CN. - C4: Larger than C3. - C5: Larger than C4. - CC1 to CC5: Clearances for cylindrical roller bearings. - MC1 to MC6: Clearances for miniature ball bearings. - CM/CT: Special clearances for motor applications. 8. **Precision Grade** - P0: Standard precision (JIS level 0). - P6: Precision grade 6 (JIS level 6). - P6X: Precision grade 6X (JIS level 6X). - P5: Precision grade 5 (JIS level 5). - P4: Precision grade 4 (JIS level 4). - P2: Precision grade 2 (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 bearings with temperature limit below 200°C. If you're looking to understand how to interpret these codes, it's always best to refer to the manufacturer's documentation or consult with a bearing specialist. Proper identification ensures optimal performance and longevity of your machinery. For more information on bearings, visit our website or contact us directly. Don’t forget to share this guide with your colleagues who may find it helpful.

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