NSK bearing suffix guide & designation decoder
Read common metric bearing numbers, decode supported brand-specific suffixes and inspect full catalogue records. Unrecognized codes stay visible for verification.
Enter the original marking
Try SKF 6205-2RSH/C3, NSK 6205DDU, KOYO 608ZZ or NTN 6205LLU. Select the matching manufacturer first.
NSK supported suffixes
| Suffix | Meaning | Supported scope |
|---|---|---|
| C2 | Radial clearance below Normal | Common metric radial series |
| CN | Normal radial clearance | Common metric radial series |
| C3 | Radial clearance above Normal | Common metric radial series |
| C4 | Radial clearance above C3 | Common metric radial series |
| C5 | Radial clearance above C4 | Common metric radial series |
| DDU | Rubber contact seals on both sides | Common deep groove ball series |
| DU | Rubber contact seal on one side | Common deep groove ball series |
| VV | Non-contact rubber seals on both sides | Common deep groove ball series |
| V | Non-contact rubber seal on one side | Common deep groove ball series |
| ZZ | Shields on both sides | Common deep groove ball series |
| Z | Shield on one side | Common deep groove ball series |
Only these exact tokens are decoded. The dictionary is intentionally not presented as the manufacturer's complete designation system.
SKF suffix reference
11 verified common codes. Read the scope and keep special variants intact.
Open decoder →NSKNSK suffix reference
11 verified common codes. Read the scope and keep special variants intact.
Open decoder →KOYOKOYO suffix reference
13 verified common codes. Read the scope and keep special variants intact.
Open decoder →NTNNTN suffix reference
3 verified common codes. Read the scope and keep special variants intact.
Open decoder →All nine brands can be searched in the main decoder. FAG, INA, TIMKEN, IKO and NACHI currently use catalogue-record lookup without an independently verified suffix dictionary. Missing fields remain unknown.
How the common metric bore code works
| Code | Nominal bore | Example base |
|---|---|---|
| 00 | 10 mm | 6200 |
| 01 | 12 mm | 6201 |
| 02 | 15 mm | 6202 |
| 03 | 17 mm | 6203 |
| 04 and above, supported metric series | Code × 5 mm | 6205 → 25 mm |
| Miniature 60x | Final digit in mm | 608 → 8 mm |
The rule does not decode inch tapered bearings, slash-bore exceptions, OEM numbers or proprietary prefixes. It does not give outside diameter, width, cage material, grease or an approved replacement.
Read the full numbering workflow →Reference basis & limitations
SKF Bearing Handbook for Electric Motors, abbreviated nomenclature; SKF Evolution, RSH sealing designs. NSK Bearing ABCs, Bearing designations; Industrial Motor Bearings, E1289c; Fits and internal clearance. JTEKT Basic Bearing Knowledge, Bearing numbers, section 6-3. NTN Americas technical FAQs, seal types and C3 clearance. Reference data checked 1 October 2026. Product-specific drawings and current manufacturer requirements take priority.
BearingScope is an independent technical lookup service. Unknown values are not filled with estimates. These references do not certify interchangeability or application suitability.