Wiper seal Prädifa series A7 | Product Series

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Inside Diameter (mm)

Outside Diameter (mm)

Element Height (mm)

Groove Width

Minimum Working Temperature (C)

Maximum Working Temperature (C)

Seal Material

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Wiper seal Prädifa series A7 Wiper seal Prädifa series A7

Wiper seal Prädifa series A7

Where to Buy

Wiper seal, single-acting, standard.

Technical Specifications

  • Thermal Application Type: Expanded Low and High Temperature (< -35 to 140°C), High Temperature (< 205°C), Standard Moderate Temperature (-35 to 100°C)
  • Media: Hydraulic
  • Polymer Material Options: Polyamide (PA)
  • Maximum Operating Pressure: 0 bar
  • Minimum Operating Temperature: -40 °C
  • Maximum Operating Temperature: 110 to 140 °C
  • Maximum Surface Speed: 1 m/sec
  • Unit of Measure: Length: mm
  • Cushioning Mechanism: No

Full Product Description

The A7 wiper seal / ring primarily serves as a scraper and additionally prevents ingress of dust, dirt, sand and swarf into dynamic rod guidances. This is achieved by its special shape and largely prevents scoring, protects the guidance parts and extends the service life of the seals. The A7 wiper ring is used to scrape heavily adhering particles off the cylinder rod. It should always be used in combination with an elastomer wiper seal. In this configuration, the A7 wiper seal closes the rod sealing system vis-à-vis the environment of the hydraulic cylinder. Pressure loading against the back of the ring should be prevented.

• Outstanding scraper properties for harsh sticking particles.

• Extreme wear resistance.

Range of application:

The A7 wiper ring is used in axially operated rods in hydraulic and pneumatic working cylinders, plungers and rod guidances in earth moving and mining equipment.

Related Documents

Literature and Reference Materials
Installation Guidelines for Rod Seals--PTD3350
Storage and Cleaning of Elastomer Seals--PTD3032
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
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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
A7A012W5007 100 112 2 2.1 -40 110 W5007
A7B022W5007 110 122 2 2.1 -40 110 W5007
A7E060W5007 140 160 2.5 2.6 -40 110 W5007
A7F070W5007 150 170 2.5 2.6 -40 110 W5007
A7G080W5007 160 180 2.5 2.6 -40 110 W5007
A7L020W5007 200 220 2.5 2.6 -40 110 W5007
A75090W5007 59.5 71 1.9 2 -40 110 W5007
A77082W5007 70 82 2 2.1 -40 110 W5007
A78092W5007 80 92 2 2.1 -40 110 W5007
A79012W5007 90 102 2 2.1 -40 110 W5007
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