All profiles listed here are SKF standard machined K03 piston seals and can be produced in virtually any dimension and in different materials.
K03 piston seals are asymmetric, single-acting loaded hydraulic lip seals designed to seal pressurized space against the atmosphere or – in case of back-to-back arrangement with intermediate guide ring – to seal between two pressurized spaces, mainly for reciprocating movements.
These seals are part of the comprehensive SKF machined seals assortment and the design is based on applications in aggressive media or with high thermal demands. The operating parameters are as defined in the sealing and material data sheet. Requirements deviating from these parameters can be met to a certain degree by changing the geometry in the SKF SEAL JET machine software.
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Application range
- Reciprocating pistons in hydraulic cylinders – valid for K03-P
- Piston seal for shifting (e.g. clutch operation) or clamping functions – valid for K03-P
- Reciprocating and swivelling pistons in hydraulic cylinders, push rods, fittings in chemical industry – valid for K03-F, K03-S and K03-SX
- When using appropriate preload element also suitable for low temperatures (down to -50°C) – valid for K03-P
Materials
Material selection has a significant impact on the seal performance as well as reliability of the whole system.
Recommended sealing materials and operating parameters are defined in the seal data sheets.
For special requirements on service temperature and media compatibility, various ECOPUR polyurethane and SKF Ecoflon materials are available.
You can see the recommended standard material combinations for the different K03 designs in the table below.
| Design | K03-F | K03-P | K03-S | K03-SX |
| Sealing element | SKF Ecoflon 3 | ECOPUR | SKF Ecoflon 3 | SKF Ecoflon 3 |
| Energizer / spring | FKM 75 | NBR 70 | 1.4310 | 1.4310 |
For specific application related requirements, various thermoplastic materials are available on demand.
For higher gliding speeds, we recommend K03-F with thermoplastic materials, but attention should be paid to limitations in installation behaviour and leak tightness.
For decreased leakage rates we recommend K03-P with ECOPUR polyurethane materials, but attention should be paid to limitation in gliding speed.
Alternative energizer materials (such as NBR, MVQ, EPDM, H-NBR, etc.) are used for special requirements on service temperature and media compatibility.
Available seal versions
There are different versions of the K03 seals with specific features available (please find more detailed information in the related detailed profile descriptions and seal data sheets linked below).
| K03-F | K03-P | K03-S | K03-SX |
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