Symmetrical Rod and Piston Seal Prädifa series SA , Ultrathan® | South Africa

Symmetrical Rod and Piston Seal Prädifa series SA , Ultrathan® | Product Series

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Symmetrical Rod and Piston Seal Prädifa series SA , Ultrathan®

Rod seal for hydraulic cylinders, single-acting, polyurethane compact PARK-O-PAK® design. For high-pressure applications. Robust seal profile for harsh operating conditions. Short axial assembly length.

Technical Specifications

  • Inside Diameter: 5 to 279.4 mm
  • Outside Diameter: 12 to 298.5 mm
  • Thermal Application Type: Expanded Low and High Temperature (< -35 to 140°C), Standard Moderate Temperature (-35 to 100°C)
  • Pressure Rating: High Pressure (< 500 bar), Low Pressure (< 160 bar)
  • Media: Hydraulic
  • Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Thermoplastic Copolyester Elastomer (TPC, TPE), Ethylene Propylene Rubber (EPM, EPR, EPDM)
  • Maximum Operating Pressure: 350 bar
  • Minimum Operating Temperature: -50 to -20 °C
  • Maximum Operating Temperature: 80 to 150 °C
  • Maximum Surface Speed: 0.5 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No
Safety Warning

Full Product Description

The PARK-O-PAK® rod seal SA made of wear-resistant Ultrathan® is a compact seal design for hydraulic applications. Due to its symmetric design, the seal can also be used as a piston seal.
The O-ring guarantees the pre-loading of the seal lips, even under low pressures or vacuum. Due to the good setting behavior of the elastomer O-ring, this pre-loading is largely constant. As system pressure increases, compression of the sealing edges rises due to the pressure-dependent deformation of the seal profile.

There are three variants of the PARK-O-PAK® product series. The product series BA is suitable for standard grooves, e.g. according to ISO 5597. The product series SA is suitable for axially short compact designs. The product series TA is suitable for radially slim designs, e.g. for telescopic cylinders.


• Robust seal profile for harshest operating conditions.
• Extreme wear resistance.
• Easier installation.
• Insensitive to pressure peaks.
• High extrusion resistance.
• Excellent media resistance in case of suitable compound selection.
• Suitable compounds available for special requirements of the chemical process industry.
• Suitable compounds available for special requirements of the food processing industry.
• Installation in closed and undercut housings.
• Short axial assembly length.
• Low compression set.
• Further dimensions of machined series with short lead times available.

Range of application:
Mainly for the sealing of piston rods and plungers in heavy duty applications in mobile and stationary hydraulics.

The SA rod seal is available in the following compounds:
00030 - Industrial applications
00020 - Light-duty
00043 - Low temperatures
00064 - Heavy-duty

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