NSK Post Code

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NSK bearings are widely used in various industrial applications due to their high performance and reliability. Understanding the NSK post code system is essential for identifying the correct bearing type, specifications, and features. Here is a breakdown of common NSK post codes: 1. **Internal Design** - C: Standard internal design - CA: Brass solid cage - CD: Stamped cage, suitable for high-load spherical roller bearings - E: High-load cylindrical roller bearing - H: High-load thrust spherical roller bearing 2. **Material Type** - G: Inner ring and rolling elements made of carburized steel - H: Inner ring and rolling elements made of stainless steel 3. **Cage Material** - M: Copper alloy solid cage - T: Synthetic resin cage - W: Stamped cage - V: No cage (open design) 4. **Seals and Dust Covers** - Z: One side with steel dust cover - ZS: One side with steel dust cover and seal - ZZ: Both sides with steel dust covers - ZZS: Both sides with steel dust covers and seals - D: One side with contact rubber seal - DD: Two sides with contact rubber seals - V: One side with non-contact rubber seal - VV: Two sides with non-contact rubber seals 5. **Outer Ring Shape** - K: Tapered bore, taper ratio 1:12 - K30: Tapered bore, taper ratio 1:30 - E: Outer ring with cut or oil hole - E4: Oil groove on outer ring, with oil hole - N: Outer ring with stop groove - NR: Outer ring with stop groove and stop ring 6. **Mounting and Fit** - DB: Back-to-back arrangement - DF: Face-to-face arrangement - DT: Series arrangement - +K: Outer ring with pad - +L: Inner ring with pad - +KL: Both inner and outer rings with pads - H: Adapter sleeve configuration - AH: Open sleeve configuration - HJ: L-shaped gear ring configuration 7. **Special Standards** - X26: Operating temperature below 150°C - X28: Operating temperature below 200°C - X29: Operating temperature below 250°C - S11: Spherical roller bearings, operating temperature below 200°C Understanding these codes helps engineers and technicians select the right bearing for specific applications, ensuring optimal performance and longevity. --- **Related Bearing Knowledge** - Bearing Steel Ball Manufacturing Process - NTN Bearing Data and Common Machine Tool Spindle Bearings - Gas Turbine Bearings: Types and Characteristics - Common Types of Bearing Steels This article is sourced from the China Bearing Network. For more information, visit [http://www.chinabearing.net](http://www.chinabearing.net). Previous: The Use of Double Row Angular Contact Ball Bearings Next: How to Correct Paper Machine Bearings Online?

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