Piston guide ring Prädifa series FK | Product Series

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Outside Diameter (mm)

Groove Diameter (mm)

Element Height (mm)

Groove Width

Bore Diameter

Minimum Working Temperature (°C)

Maximum Working Temperature (°C)

Piston Diameter

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Piston guide ring Prädifa series FK Piston guide ring Prädifa series FK

Piston guide ring Prädifa series FK

Where to Buy

Piston guide ring for oil-lubricated applications, such as hydraulics cylinders. Extremely wear-resistant. Superior compression strength: 340 N/mm2. ISO 10766.

Technical Specifications

  • Thermal Application Type: Expanded Low and High Temperature (< -35 to 140°C), Standard Moderate Temperature (-35 to 100°C)
  • Seal Material: Q5029, Q5038
  • Media: Hydraulic
  • Polymer Material Options: Phenolic Resin Fabric
  • Permissible Specific Load: 270 N/mm2, 340 N/mm2
  • Minimum Operating Temperature: -50 °C
  • Maximum Operating Temperature: 120 to 130 °C
  • Maximum Surface Speed: 5 m/sec
  • Unit of Measure: Length: mm
  • Optimized Load Capacity Feature: No
Safety Warning

Full Product Description

The FK guide ring made of fabric phenolic resin laminate is intended for use in hydraulic cylinders. The guide ring is created in a slit form (45 ° cut) to enable installation. In addition, the slit version ensures that the system pressure can pass toward the seal, taking thermal expansions into account.

The FK guide ring is exceptionally pressure-resistant and wear-resistant. Pressure resistance is much higher than that of guiding elements made of other plastics.

After installation, the FK guide ring has an interference fit against the bottom of the groove.

• Minimal play due to extremely small manufacturing tolerances of the guiding elements.
• Vibration absorption effect.
• Extreme wear resistance.
• Improved sliding properties due to surface structure.
• Easy snap assembly without assembly aids.
• Significantly higher permissible loading pressure compared with other guidance tape materials.
• Dimensions according to ISO 10766.
• Also available as bulk material.
• Any desired nominal diameter available due to use of machining technique.
• Installation in closed and undercut housings.

Range of application:
Guiding element for pistons and piston rods in hydraulic cylinders.

Related Documents

Literature and Reference Materials
Hydraulic Seals--PTD3350
Guiding ring (piston) FK--PTD3350
Product Demos & Tutorials
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 Outside Diameter (mm) Groove Diameter (mm) Element Height (mm) Groove Width Bore Diameter Minimum Working Temperature (°C) Maximum Working Temperature (°C) Piston Diameter
FK2923Q5029 28 23 6.3 6.3 28 -50 120 27.8
FK3227Q5038 32 27 5.6 5.6 32 -50 130 31.8
FK3631Q5038 36 31 5.6 5.6 36 -50 130 35.8
FK4136Q5038 41 36 5.6 5.6 41 -50 130 40.7
FK4237Q5038 42 37 5.6 5.6 42 -50 130 41.7
FK4439Q5038 44 39 5.6 5.6 44 -50 130 43.6
FK4540Q5029 45 40 5.7 5.7 45 -50 120 44.6
FK5043Q5038 50 45 5.6 5.6 50 -50 130 49.6
FK5045Q5029 50 45 9.7 9.7 50 -50 120 49.6
FK5356Q5038 63 58 5.6 5.6 63 -50 130 62.6
FK5550Q5029 55 50 5.7 5.7 55 -50 120 54.6
FK5752Q5029 57.1 52.1 9.7 9.7 57.1 -50 120 56.7
FK6055Q5029 60 55 5.7 5.7 60 -50 120 59.6
FK6055Q5038 60 55 5.7 5.7 60 -50 130 59.6
FK6359Q5029 63 58 6.3 6.3 63 -50 120 62.6
FK6359Q5038 63 58 6.3 6.3 63 -50 130 62.6
FK6560Q5029 65 60 6.3 6.3 65 -50 120 64.5
FK6561Q5038 65 60 5.6 5.6 65 -50 130 64.5
FK6964Q5038 69 64 5.6 5.6 69 -50 130 68.5
FK7065Q5029 70 65 6.3 6.3 70 -50 120 69.5
FK7066Q5029 70 66 10.3 10.3 70 -50 120 69.5
FK7469Q5038 74 69 5.6 5.6 74 -50 130 73.5
FK7470Q5038 74 69 9.7 9.7 74 -50 130 73.5
FK7570Q5029 75 70 9.7 9.7 75 -50 120 74.5
FK7671Q5029 76.2 71.2 9.7 9.7 76.2 -50 120 75.7
FK8075Q5029 80 75 6.3 6.3 80 -50 120 79.5
FK8076Q5029 80 75 9.7 9.7 80 -50 120 79.5
FK8076Q5038 80 75 9.7 9.7 80 -50 130 79.5
FK8479Q5038 84 79 5.6 5.6 84 -50 130 83.5
FK8580Q5029 85 80 6.3 6.3 85 -50 120 84.5
FK8581Q5038 85 80 9.7 9.7 85 -50 130 84.5
FK9084Q5038 90 85 5.6 5.6 90 -50 130 89.5
FK9086Q5038 90 85 9.7 9.7 90 -50 130 89.5
FK9591Q5038 95 90 5.6 5.6 95 -50 130 94.5
FKA095Q5029 100 95 9.7 9.7 100 -50 120 99.4
FKA095Q5038 100 95 9.7 9.7 100 -50 130 99.4
FKB005Q5038 110 105 9.7 9.7 110 -50 130 109.4
FKB110Q5029 115 110 15 15 115 -50 120 114.4
FKC115Q5029 120 115 9.7 9.7 120 -50 120 119.4
FKJ025Q5038 180 175 25 25 180 -50 130 179.3
FKL195Q5038 200 195 25 25 200 -50 130 199.3
FKM225Q5038 230 225 25 25 230 -50 130 229.3
FKN245Q5038 250 245 25 25 250 -50 130 249.3
FKQ346Q5038 350 345 25 25 350 -50 130 349.0
FK9513Q5038 100 95 15 15 100 -50 130 99.4
FK4035Q5038 40 35 5.6 5.6 40 -50 130 39.7
FK6097Q5038 60 55 9.7 9.7 60 -50 130 59.6
FK6397Q5038 63 58 9.7 9.7 63 -50 130 62.6
FK7015Q5038 70 65 15 15 70 -50 130 69.5
FK7097Q5038 70 65 9.7 9.7 70 -50 130 69.5
FK8015Q5038 80 75 15 15 80 -50 130 79.5
FK8515Q5038 85 80 15 15 85 -50 130 84.5
FKB510Q5038 115 110 9.7 9.7 115 -50 130 114.4
FKC520Q5038 125 120 9.7 9.7 125 -50 130 124.4
FKE035Q5038 140 135 9.7 9.7 140 -50 130 139.4
FKG055Q5038 160 155 9.7 9.7 160 -50 130 159.3
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