| Subject | Symbol | Description |
| Seal type | ZZ | Metal shields on both sides. |
| 2RS | Rubber seals on both sides. |
| Z | Metal shield on one side. |
| RS | Rubber seal on one side. |
| Radial internal clearance | C2 | Less than normal. |
| CN | Normal clearance. Is not indicated as a standard. |
| C3 | Greater clearance than normal. |
| C4 | Greater than C3. |
| C5 | Greater than C4. |
| Other technical modifications | NR | Groove with inserted snap ring in outer ring. |
| N | Snap ring groove in the outer ring. |
| SS | Stainless steel. |
| Cage type | M | Brass cage ball guided. |
| MB | Brass cage, inner ring centered. |
| MA | Brass cage, outer ring centered. |
| Speed ratings | V | Normal vibration level. Is not indicated as a standard. |
| V2 | Lower vibration level than normal. |
| V3 | Lower vibration level than V2. |
| V4 | Lower vibration level than V3. |
| Tolerances | P0 | Normal tolerance level. Is not indicated as a standard. |
| P6 | Greater tolerance level than P0. |
| P5 | Greater tolerance level than P6. |
Complaint
