Piston sealing set Prädifa series OK | Product Series

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Inside Diameter (mm)

Element Height (mm)

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Minimum Working Temperature (C)

Maximum Working Temperature (C)

Seal Material

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Piston sealing set Prädifa series OK

Piston sealing set Prädifa series OK

Where to Buy

Piston sealing set for hydraulic cylinders, double-acting. Slide ring design. For high pressures and extreme pressure peaks. 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: Polyamide (PA)
  • Maximum Operating Pressure: 800 bar
  • Minimum Operating Temperature: -40 to -15 °C
  • Maximum Surface Speed: 1 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No
  • Pressure Rating: Extremely High Pressure (> 500 bar)
Safety Warning

Full Product Description

The profile OK piston sealing set is primarily designed for heavy-duty hydraulic applications and is preferably used in double-acting cylinders. It is extremely robust and withstands even extreme pressure peaks.
The sealing set consists of a plastic slide ring and an elastomer energizer.

• Extreme wear resistance.
• Easy installation on single-part piston without assembly aids due to the split design of the sealing ring.
• Assembly on one-part piston is possible.
• Insensitive to extreme pressure peaks.
• Extremely high extrusion resistance.
• High extrusion resistance in case of high pressures and large gaps due to the special compound properties of the seal ring.
• Dimensions according to ISO ­7425-1.
• Short axial assembly length.
• Installation in closed and undercut housings.
• Further dimensions of machined series with short lead times available.

Range of application:
Heavy-duty hydraulic 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
Communities, Blogs & Industry Links
Industry Hydraulics
Literature and Reference Materials
Hydraulic Seals--PTD3350
Compound Data Sheet NBR N3571
Compound Data Sheet PA66 W5019
Installation Guidelines for Piston Seals--PTD3350
Piston sealing set OK--PTD3350
Storage and Cleaning of Elastomer Seals--PTD3032
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Products Outside Diameter (mm) Inside Diameter (mm) Element Height (mm) Groove Width Minimum Working Temperature (C) Maximum Working Temperature (C) Seal Material
OK033000701 330 302 9.5 9.5 -30 110 W5019
OK035000701 350 322 9.5 9.5 -30 110 W5019
OK037000701 370 342 9.5 9.5 -30 110 W5019
OK042000701 420 392 9.5 9.5 -30 110 W5019
OK048000701 480 452 9.5 9.5 -30 110 W5019
OK113500701 135 114 8 8 -30 110 W5019
OK902600701 25 16 4.2 4.2 -20 140 W5019
OK903200701 32 21 4.2 4.2 -20 140 W5019
OK904200701 40 29 4.2 4.2 -20 140 W5019
OK904900701 50 34.5 6.3 6.3 -20 140 W5019
OK906200701 63 47.5 6.3 6.3 -20 140 W5019
OK908300701 80 64.5 6.3 6.3 -20 140 W5019
OK910100701 100 84.5 6.3 6.3 -20 140 W5019
OK912500701 125 104 8 8 -20 140 W5019
OK916000701 160 139 8 8 -20 140 W5019
OK920000701 200 179 8 8 -20 140 W5019
OK925000701 250 229 8 8 -20 140 W5019
OK003200701 32 21 4.2 4.2 -30 110 W5019
OK004000701 40 26.3 5.8 5.8 -30 110 W5019
OK004200701 40 29 4.2 4.2 -30 110 W5019
OK004500704 45 34 4.2 4.2 -30 110 W5019
OK004900701 50 34.5 6.3 6.3 -30 110 W5019
OK005000701 50 36.3 5.8 5.8 -30 110 W5019
OK005000704 50 39 4.2 4.2 -30 110 W5019
OK005100704 50 37 8 8 -30 110 W5019
OK005400704 55 44 4.2 4.2 -30 110 W5019
OK006000704 60 49 4.2 4.2 -30 110 W5019
OK006100704 60 41.7 7 7 -30 110 W5019
OK006200701 63 47.5 6.3 6.3 -30 110 W5019
OK006300701 63 44.7 7 7 -30 110 W5019
OK006400704 63 52 4.2 4.2 -30 110 W5019
OK006500704 65 54 4.2 4.2 -30 110 W5019
OK007000701 70 51.7 7 7 -30 110 W5019
OK007000704 70 59 4.2 4.2 -30 110 W5019
OK007200704 70 54.5 6.3 6.3 -30 110 W5019
OK007500701 75 54 8 8 -30 110 W5019
OK007600701 75 59.5 6.3 6.3 -30 110 W5019
OK008000701 80 59 8 8 -30 110 W5019
OK008300701 80 64.5 6.3 6.3 -30 110 W5019
OK008500701 85 64 8 8 -30 110 W5019
OK009000701 90 69 8 8 -30 110 W5019
OK009100701 90 74.5 6.3 6.3 -30 110 W5019
OK009500704 95 74 8 8 -30 110 W5019
OK010000701 100 79 8 8 -30 110 W5019
OK010100701 100 84.5 6.3 6.3 -30 110 W5019
OK010500701 105 84 8 8 -30 110 W5019
OK011000701 110 89 8 8 -30 110 W5019
OK011100701 110 94.5 6.3 6.3 -30 110 W5019
OK011500701 115 94 8 8 -30 110 W5019
OK011600701 115 100 8 8 -30 110 W5019
OK012000701 120 99 8 8 -30 110 W5019
OK012400701 125 109.5 6.3 6.3 -30 110 W5019
OK012500701 125 104 8 8 -30 110 W5019
OK013000701 130 109 8 8 -30 110 W5019
OK013200701 130 115 8 8 -30 110 W5019
OK014000701 140 119 8 8 -30 110 W5019
OK014500701 145 124 8 8 -30 110 W5019
OK015000701 150 129 8 8 -30 110 W5019
OK015100701 150 135 8 8 -30 110 W5019
OK015200701 152.4 131.5 8 8 -30 110 W5019
OK016000701 160 139 8 8 -30 110 W5019
OK016300701 160 148 8 8 -30 110 W5019
OK016500701 165 144 8 8 -30 110 W5019
OK017000701 170 149 8 8 -30 110 W5019
OK017500701 175 154 8 8 -30 110 W5019
OK018000701 180 159 8 8 -30 110 W5019
OK019000701 190 169 8 8 -30 110 W5019
OK020000701 200 179 8 8 -30 110 W5019
OK021000701 210 189 8 8 -30 110 W5019
OK022000701 220 199 8 8 -30 110 W5019
OK022100701 220 205 8 8 -30 110 W5019
OK023000701 230 209 8 8 -30 110 W5019
OK024000701 240 225 8 8 -30 110 W5019
OK025000701 250 229 8 8 -30 110 W5019
OK026000704 260 239 8 8 -30 110 W5019
OK027000701 270 249 8 8 -30 110 W5019
OK028000701 280 255.5 8 8 -30 110 W5019
OK029000701 290 271 9.5 9.5 -30 110 W5019
OK030000701 300 272 9.5 9.5 -30 110 W5019
OK032000701 320 292 9.5 9.5 -30 110 W5019
OK002500704 25 16 24.3 4.2 -40 110 W5019
OK003200704 32 21 31.3 4.2 -40 110 W5019
OK004000704 40 29 39.3 4.2 -40 110 W5019
OK017500704 175 154 173.8 8 -40 110 W5019
OK023000704 230 209 228.4 8 -40 110 W5019
OK013000704 130.0 109.0 8 8.0 -30 110 W5019
OK025000704 250.0 229.0 8 8.0 -30 110 W5019
OK025500701 255.0 234.0 8 8.0 -30 110 W5019
OK030100701 300.0 272.0 9.5 9.5 -30 110 W5019
OK014500704 145 124 8 8 -30 110 W5019
OK021500701 215 194 8 8 -30 110 W5019
OK036000701 360 332 9.5 9.5 -30 110 W5019
OK012000704 120 99 8 8 -30 110 W5019
OK015000704 150 129 8 8 -30 110 W5019
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