Piston sealing set Prädifa series KR, Ultrathan® | Product Series

Filter by

    No filters selected

Outside Diameter (mm)

Inside Diameter (mm)

Element Height (mm)

Groove Width

Minimum Working Temperature (C)

Maximum Working Temperature (C)

Seal Material

Get your Parker account Today!

Create one account to manage everything you do with Parker, from your shopping preferences to your application access.


LOADING IMAGES
Piston sealing set Prädifa series KR, Ultrathan®

Piston sealing set Prädifa series KR, Ultrathan®

Where to Buy

Piston seal for hydraulic cylinders, double-acting. Polyurethane slide ring design. Superior leak tightness. ISO 7425.

Technical Specifications

  • Maximum Operating Temperature: 80 to 110 °C
  • Thermal Application Type: Low Temperature (< -35°C), Standard Moderate Temperature (-35 to 100°C)
  • Media: Hydraulic
  • Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)
  • Maximum Operating Pressure: 300 bar
  • Minimum Operating Temperature: -50 to -35 °C
  • Maximum Surface Speed: 0.5 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No
  • Pressure Rating: Medium Pressure (< 250 bar)
Safety Warning

Full Product Description

The Ultrathan® piston sealing set KR complements the product range of double-acting piston seals (OE, OK) for grooves according to ISO 7425-1 by a product which is preferably used in the medium-duty pressure range up to a maximum of 300 bar. The sealing set stands out by its extreme wear resistance and exceptionally high static and dynamic sealing performance and can also be used for piston accumulators.
The KR sealing set consists of a polyurethane slide ring with improved sliding properties and particularly high modulus and an energizer with rectangular cross-section made of an NBR elastomer.

• Exceptionally high static and dynamic sealing performance.
• Good sealing performance in extremely small assembly conditions.
• Can also be used for single-acting applications.
• Robust seal profile for harshest operating conditions.
• Extreme wear resistance.
• Long service life thanks to application-optimized compounds.
• Constantly low dynamic friction throughout the part's service life.
• Easy snap assembly on a single-part piston.
• Insensitive to pressure peaks.
• Functional reliability at critical temperatures.
• High extrusion resistance.
• Dimensions according to ISO ­7425-1.
• Short axial assembly length.
• Installation in closed and undercut housings.

Range of application:
The KR piston sealing set is suitable for use in all standard industrial cylinders, farming equipment, light construction machinery and mobile devices. Due to its exceptionally high dynamic sealing performance, it is particularly well suited for leakage-critical applications.

Related Documents

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
Literature and Reference Materials
Hydraulic Seals--PTD3350
Compound Data Sheet TPU P5062
Installation Guidelines for Piston Seals--PTD3350
Storage and Cleaning of Elastomer Seals--PTD3032
Ultrathan®--Piston sealing set KR--PTD3350
×
View Catalog
Share / Email
Print
Products Outside Diameter (mm) Inside Diameter (mm) Element Height (mm) Groove Width Minimum Working Temperature (C) Maximum Working Temperature (C) Seal Material
KR002000701 20 12.5 3.2 3.2 -35 110 P5062
KR002500701 25 17.5 3.2 3.2 -35 110 P5062
KR003200701 32 24.5 3.2 3.2 -35 110 P5062
KR004000701 40 29 4.2 4.2 -35 110 P5062
KR004500701 45 34 4.2 4.2 -35 110 P5062
KR005000701 50 39 4.2 4.2 -35 110 P5062
KR005000703 50 39 4.2 4.2 -50 100 P5062
KR006000701 60 49 4.2 4.2 -35 110 P5062
KR006300701 63 52 4.2 4.2 -35 110 P5062
KR006500701 65 52 6.3 6.3 -35 110 P5062
KR007000701 70 59 4.2 4.2 -35 110 P5062
KR007500701 75 59.5 6.3 6.3 -35 110 P5062
KR008000701 80 64.5 6.3 6.3 -35 110 P5062
KR008500701 85 71.5 6.3 6.3 -35 110 P5062
KR009000701 90 74.5 6.3 6.3 -35 110 P5062
KR009500701 95 79.5 6.3 6.3 -35 110 P5062
KR010000701 100 84.5 6.3 6.3 -35 110 P5062
KR010500701 105 89.5 6.3 6.3 -35 110 P5062
KR011500701 115 94 8.1 8.1 -35 110 P5062
KR012500701 125 109.5 6.3 6.3 -35 110 P5062
KR016000701 160 139 8.1 8.1 -35 110 P5062
KR018000701 180 159 8.1 8.1 -35 110 P5062
KR020000701 200 179 8.1 8.1 -35 110 P5062
KR103200701 32 21 4.2 4.2 -35 110 P5062
KR104500701 45 32 6.3 6.3 -35 110 P5062
KR105000701 50 34.5 6.3 6.3 -35 110 P5062
KR105500701 55 39.5 6.3 6.3 -35 110 P5062
KR106000701 60 44.5 6.3 6.3 -35 110 P5062
KR107000701 70 54.5 6.3 6.3 -35 110 P5062
KR108000701 80 66.5 6.3 6.3 -35 110 P5062
KR108000703 80 66.5 6.3 6.3 -50 100 P5062
KR108500701 85 69.5 6.3 6.3 -35 110 P5062
KR110000701 100 86.5 6.3 6.3 -35 110 P5062
KR111000701 110 89 8.1 8.1 -35 110 P5062
KR112000701 120 99 10.5 10.5 -35 110 P5062
KR112500701 125 104 8.1 8.1 -35 110 P5062
KR202500701 25 16 4.2 4.2 -35 110 P5062
KR206300701 63 47.5 6.3 6.3 -35 110 P5062
KR207000701 70 57 6.3 6.3 -35 110 P5062
KR207500701 75 62 6.3 6.3 -35 110 P5062
KR210000701 100 79 8.1 8.1 -35 110 P5062
KR212000701 120 99 8.1 8.1 -35 110 P5062
KR212500701 125 104 10.5 10.5 -35 110 P5062
KR214000701 140 119 8.1 8.1 -35 110 P5062
KR214000715 140 119 8.1 8.1 -40 80 P5062
KR304000701 40 32.5 3.2 3.2 -35 110 P5062
KR306300701 63 50 6.3 6.3 -35 110 P5062
KR408000701 80 69 4.2 4.2 -35 110 P5062
KR007200701 72.0 61.0 4.2 4.2 -35 110 P5062
Close [ x ]
Full Screen
687PDC
687424