Rod seal Prädifa series BU, Ultrathan® | Product Series

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Rod seal Prädifa series BU, Ultrathan® Rod seal Prädifa series BU, Ultrathan®

Rod seal Prädifa series BU, Ultrathan®

Where to Buy

Rod and buffer seal for hydraulic cylinders, single-acting. Compact seal design with anti-extrusion ring. Primary seal in tandem systems. For high pressures and extreme pressure peaks. Robust design with extreme wear resistance. ISO 5597 and ISO 7425.

Technical Specifications

  • Thermal Application Type: High Temperature (< 205°C), Standard Moderate Temperature (-35 to 100°C), Low Temperature (< -35 C)
  • Media: Hydraulic
  • Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)
  • Maximum Operating Pressure: 500 bar
  • Minimum Operating Temperature: -45 to -20 °C
  • Maximum Operating Temperature: 80 to 110 °C
  • Maximum Surface Speed: 0.5 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No
  • Pressure Rating: High Pressure (< 500 bar)
Safety Warning

Full Product Description

The BU Ultrathan® rod seal is a compact seal with an integrated anti-extrusion ring. It is frequently used as a buffer seal within sealing systems such as those utilized in construction machine cylinders. Construction machine cylinders operate in harsh conditions in which pressure peaks of up to 1000 bar frequently occur. The BU rod seal is installed upstream to isolate such loads from the secondary seal. Due to its special shape, the seal (like a return valve) is able to return pressure that may build up between the primary and the secondary seal into the system. A single or tandem arrangement of this product series is possible as well.

• Enhanced sealing performance in non-pressurized conditions.
• Robust seal profile for harshest operating conditions.
• Extreme wear resistance.
• 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.
• Dimensions according to ISO ¬7425-2.
• Short axial assembly length.
• Installation in closed and undercut housings.
• Further dimensions of machined series with short lead times available.

Range of application:
Mainly used for sealing cylinders in mobile hydraulics.

The BU rod seal is available in the following compounds:
00575 - Bio-degradable fluids
00655 - Low temperatures
00656 - Industrial applications
00664 - Heavy-duty

Related Documents

Literature and Reference Materials
Hydraulic Seals--PTD3350
Compound Data Sheet TPU P5008
Installation Guidelines for Rod Seals--PTD3350
Storage and Cleaning of Elastomer Seals--PTD3032
Ultrathan® --Rod seal BU--PTD3350
Product Demos & Tutorials
How to Properly Store and Clean Elastomer Seals
Mixing the right ingredients: Material Development at Parker-Prädifa
Parker Final Exam in Physics / Sealing Systems Put to the Test
Communities, Blogs & Industry Links
Industry Hydraulics
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Products Inside Diameter (mm) Outside Diameter (mm) Element Height (mm) Groove Width Minimum Working Temperature (C) Maximum Working Temperature (C) Seal Material
BU003200664 32 43 4 4.2 -35 110 P6000
BU004000664 40 55.1 6.1 6.3 -35 110 P6000
BU004500664 45 60.1 6.1 6.3 -35 110 P6000
BU005000664 50 65.1 6.1 6.3 -35 110 P6000
BU005600600 56 71 8.5 9.5 -35 100 P5008
BU006000600 60 75 8.5 9.5 -35 100 P5008
BU006100656 60 75.1 6.1 6.3 -35 100 P5008
BU006300656 63 78.1 6.1 6.3 -35 100 P5008
BU006500600 65 80 8.5 9.5 -35 100 P5008
BU006600656 65 80.5 6.1 6.3 -35 100 P5008
BU007000600 70 85 8.5 9.5 -35 100 P5008
BU007000656 70 85.5 6.1 6.3 -35 100 P5008
BU007100656 70 85.1 6.1 6.3 -35 100 P5008
BU007500600 75 90 8.5 9.5 -35 100 P5008
BU007600656 75 90.5 6.1 6.3 -35 100 P5008
BU008000600 80 95 8.5 9.5 -35 100 P5008
BU008200656 80 95.5 6.1 6.3 -35 100 P5008
BU008400656 80 95.1 6.1 6.3 -35 100 P5008
BU008500600 85 100 8.5 9.5 -35 100 P5008
BU008500656 85 100.5 6.1 6.3 -35 100 P5008
BU009000600 90 105 8.5 9.5 -35 100 P5008
BU009100656 90 105.5 6.1 6.3 -35 100 P5008
BU009400656 95 110.5 6.1 6.3 -35 100 P5008
BU010000600 100 120 11.4 12.5 -35 100 P5008
BU010400656 100 115.5 6.1 6.3 -35 100 P5008
BU010500656 105 120.5 6.1 6.3 -35 100 P5205
BU011000600 110 130 11.4 12.5 -35 100 P5008
BU011000664 110 130 11.4 12.5 -35 110 P6000
BU011800656 110 125.5 6.1 6.3 -35 100 P5008
BU012000600 120 140 11.4 12.5 -35 100 P5008
BU013000600 130 150 14.5 16 -35 100 P5008
BU014000600 140 160 14.5 16 -35 100 P5008
BU014100664 140 155.5 6.1 6.3 -35 110 P6000
BU015000600 150 170 14.5 16 -35 100 P5008
BU016000600 160 180 14.5 16 -35 100 P5008
BU017000657 170 195 14.5 16 -35 100 P5008
BU018000570 180 205 14.5 16 -35 100 P5000
BU018000600 180 205 14.5 16 -35 100 P5008
BU020000600 200 225 14.5 16 -35 100 P5008
BU020000664 200 225 14.5 16 -35 110 P6000
BU021000664 210 240 18.2 20 -35 110 P6000
BU022000600 220 250 18.2 20 -35 100 P5008
BU023000655 230 260 18.2 20 -45 90 P5209
BU023000657 230 260 18.2 20 -35 100 P5008
BU025000657 250 280 18.2 20 -35 100 P5008
BU028000600 280 310 18.2 20 -35 100 P5008
BU028000664 280 310 18.2 20 -35 110 P6000
BU030000664 300 330 18.2 20 -35 110 P6000
BU025000600 250 280 18.2 20 -45 110 P5008
BU028000657 280 310 18.2 20 -45 110 P5008
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