Rod seal Prädifa series B4 | #B4025000657


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B4025000657

Rod seal Prädifa series B4 | #B4025000657

Rod seal for hydraulic cylinders, single-acting, polyurethane u-cup design with anti-extrusion ring. For high-pressure applications and extreme pressure peaks. Robust seal profile for harshest operating conditions. ISO 5597, ISO 6020.


Technical Specifications

  • Maximum Working Temperature (C): 100
  • Groove Width: 25
  • Outside Diameter (mm): 280
  • Minimum Working Temperature (C): -35
  • Inside Diameter (mm): 250
  • Seal Material: P5008
  • Element Height (mm): 22.7
  • Media: Hydraulic
  • Polymer Material Options: TPU (Polyurethane)
  • Maximum Operating Pressure: 500 bar
  • Minimum Operating Temperature: -45 to -20 °C
  • Maximum Operating Temperature: 95 to 110 °C
  • Maximum Surface Speed: 0.5 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No
  • Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C
  • Pressure Rating: Extremely High Pressure (> 500 bar) bar
Safety Warning

Item Information

The B4 Ultrathan® rod seal is a U-ring with interference fit on the outer diameter. It is extremely wear-resistant and, due to the anti-extrusion ring, resistant against pressure peaks and ensures reliable load holding performance. It is suitable for high-pressure hydraulics applications of up to 1000 bar.

• Robust seal profile for harshest operating conditions.
• Extreme wear resistance.
• Easier installation.
• Insensitive to extreme pressure peaks.
• Extremely 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.
• Dimensions according to ISO 5597.
• Installation in closed and undercut housings.
• Additional sizes of machined products available on short notice.

Range of application:
Mainly for the sealing of piston rods and plungers in heavy-duty applications in mobile and stationary hydraulics. The dimensions mainly conform to the requirements of ISO 5597 and ISO 3320 for housing and diameters respectively.

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Part Number
B4025000657 STP

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