UN oil seal is a one-way sealing element, in the hydraulic cylinder, mainly used for piston rod seal, in many applications, especially in walking machinery, automobile, forestry and mining machinery, under bad working conditions, has good mechanical characteristics. In heavy duty cases, it is used in combination with RS type Sterseal has very good results.
| Material | Medium | Temperature | Speed | Pressure |
| TPU | Petroleum based hydraulic oil, liquefied oil | -30℃~+80℃ | reciprocating≤0.8m/s | ≤32Mpa |
| Model | d | D | h |
| UN-4 | 4 | 10 | 4 |
| UN-4 | 4 | 11 | 5 |
| UN-4 | 4 | 12 | 4 |
| UN-4.5 | 4.5 | 9.5 | 4 |
| UN-4.5 | 4.5 | 11 | 5 |
| UN-5 | 5 | 11 | 8 |
| UN-5 | 5 | 12 | 5 |
| UN-5 | 5 | 12 | 5.5 |
| UN-5 | 5 | 12 | 6 |
| UN-5 | 5 | 12 | 8 |
| UN-5 | 5 | 14 | 4.5 |
| UN-5 | 5 | 14 | 6 |
| UN-5 | 5 | 14 | 8 |
| UN-5 | 5 | 16 | 6 |
| UN-5 | 5 | 16 | 8 |
| UN-6 | 6 | 12 | 4 |
| UN-6 | 6 | 12 | 5 |
| UN-6 | 6 | 12 | 5.5 |
| UN-6 | 6 | 12 | 6 |
| UN-6 | 6 | 12 | 8 |
| UN-6 | 6 | 13 | 5 |
| UN-6 | 6 | 13.5 | 5 |
| UN-6 | 6 | 14 | 5 |
| UN-6 | 6 | 14 | 6 |
