Japan Seiko NSK Imported Bearing Rear Code Explanation
Source: China Bearing Network | Date: February 3, 2013
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The rear code of Japan Seiko NSK imported bearings provides detailed information about the internal structure, materials, seals, and performance characteristics of the bearing. Understanding these codes can help in selecting the right bearing for specific applications.
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: Tapered roller bearings with a smaller outer ring diameter.
2. **Material Information**
- : Ferrule made of carburized steel.
- H: Ferrule made of stainless steel.
3. **Cage Type**
- M: Solid copper alloy cage.
- T: Synthetic resin cage.
- W: Stamped cage.
- V: No cage.
4. **Seals and Dust Covers**
- Z: One side with a steel dust cover.
- ZZ: Both sides with steel dust covers.
- D: One side with a rubber seal.
- DD: Both sides with rubber seals.
- V: One side with a non-contact rubber seal.
- VV: Both sides with non-contact rubber seals.
5. **Ferrule Shape**
- K: Tapered bore, 1:12 taper.
- K30: Tapered bore, 1:30 taper.
- E: 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 Pairing**
- DB: Back-to-back paired bearings.
- DF: Face-to-face paired bearings.
- DT: Series paired bearings.
- +K: Outer ring with spacer.
- +L: Inner ring with spacer.
- +KL: Both inner and outer rings with spacers.
7. **Radial Clearance**
- C1: Smaller radial clearance than C2.
- C2: Smaller radial clearance than CN.
- CN: Standard radial clearance.
- C3: Larger radial clearance than CN.
- C4: Larger radial clearance than C3.
- C5: Larger radial clearance than C4.
- CC1: Smaller radial clearance than CC2 for cylindrical roller bearings.
- CC2: Smaller radial clearance than CN for cylindrical roller bearings.
- CC: Standard radial clearance for cylindrical roller bearings.
- CC3: Larger radial clearance than CN.
- CC4: Larger radial clearance than CC3.
- CC5: Larger radial clearance than CC4.
- MC1: Smaller radial clearance than MC2 for miniature bearings.
- MC2: Smaller radial clearance than MC3.
- MC3: Standard radial clearance for miniature bearings.
- MC4: Larger radial clearance than MC3.
- MC5: Larger radial clearance than MC4.
- MC6: Larger radial clearance than MC5.
- 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 Grade**
- 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 bearings with temperature limit below 200°C.
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