USI piston rod seals are designed for dynamic sealing applications in hydraulic cylinders where compact installation and stable sealing performance are required. The seal profile allows use as both a piston seal and a rod seal, reducing the need for multiple seal types within the same system.
The USI seal features a smaller cross-section compared with standard U-type seals, making it suitable for integrated grooves and space-restricted designs. The seal structure is optimized to improve resistance to back pressure and reduce the risk of lip damage under pressure fluctuations during operation.
Manufactured from polyurethane material, USI piston rod seals provide good wear resistance and tear strength under dynamic conditions. The seal maintains reliable contact pressure against the mating surface and is suitable for medium-pressure hydraulic applications where compact design and ease of installation are required.
USI piston rod seals are commonly used in small hydraulic systems, pneumatic equipment, precision machinery, and automation systems. In applications requiring higher pressure capacity, heavier-duty seal profiles such as UN seals may be more appropriate.
USI Piston Rod Seals Installation Profile
Typical Applications
USI piston rod seals are suitable for compact hydraulic cylinders, small hydraulic power units, pneumatic systems, precision mechanical equipment, and automated machinery where installation space is limited and moderate pressure sealing is required.
Selection Guidance
USI piston rod seals are recommended for applications with limited installation space and moderate operating pressures. For high-pressure, heavy-load, or long-stroke hydraulic cylinders, UN seals are generally preferred due to their higher structural strength and wider standard size availability.
USI Piston Rod Seals Size(mm)
| Name | d | D | h |
| USI | 10 | 18 | 5 |
| USI | 12 | 20 | 5 |
| USI | 12.5 | 20 | 5 |
| USI | 14 | 22 | 5 |
| USI | 16 | 24 | 5 |
| USI | 17 | 25 | 5 |
| USI | 18 | 26 | 5 |
| USI | 20 | 28 | 5 |
| USI | 20 | 30 | 6 |
| USI | 22 | 30 | 5 |
| USI | 22.4 | 30 | 5 |
| USI | 23.5 | 31.5 | 5 |
| USI | 24 | 32 | 5 |
| USI | 25 | 33 | 5 |
| USI | 25 | 35 | 6 |
| USI | 26 | 34 | 5 |
| USI | 27 | 35 | 5 |
| USI | 28 | 35.5 | 5 |
| USI | 28 | 36 | 5 |
| USI | 30 | 38 | 5 |
| USI | 30 | 40 | 6 |
| USI | 31.5 | 41.5 | 6 |
| USI | 32 | 42 | 6 |
| USI | 33 | 43 | 6 |
| USI | 34 | 44 | 6 |
| USI | 35 | 45 | 6 |
| USI | 35.5 | 45 | 6 |
| USI | 35.5 | 45.5 | 6 |
| USI | 36 | 46 | 6 |
| USI | 38 | 48 | 6 |
| USI | 40 | 50 | 6 |
| USI | 45 | 55 | 6 |
| USI | 45 | 56 | 7 |
| USI | 46 | 56 | 6 |
| USI | 50 | 60 | 6 |
| USI | 53 | 63 | 6 |
| USI | 55 | 65 | 6 |
| USI | 56 | 66 | 6 |
| USI | 58 | 68 | 6 |
| USI | 60 | 70 | 6 |
| USI | 60 | 71 | 7 |
| USI | 61 | 71 | 6 |
| USI | 63 | 73 | 6 |
| USI | 65 | 75 | 6 |
| USI | 67 | 77 | 6 |
| USI | 70 | 80 | 6 |
| USI | 71 | 80 | 6 |
| USI | 75 | 85 | 6 |
| USI | 80 | 90 | 6 |
| USI | 80 | 95 | 9 |
The USI piston rod seals we supply offer excellent wear resistance and tear resistance, ensuring reliable performance in dynamic hydraulic applications. With complete size availability, our sealing solutions are suitable for a wide range of industrial hydraulic systems and support flexible selection for different design and operating requirements.
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