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Wiper Seals

Wipers are designed to prevent any contamination of the system by external particles or other environmental impacts during transaortic movements in cylinders and actuators. They also provide the static sealing function on the cylinder head versus the atmosphere. Some double-acting designs also reduce the drag oil film during outstroke.

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Wiper Seal Prädifa series AD

Media: Hydraulic

Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Ultra-High Molecular Weight Polyethylene (UHMW-PE)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -50 to -25 °C

Maximum Operating Temperature: 110 to 200 °C

Maximum Surface Speed: 4 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C, High Temperature (< 205 C) °C, Low Temperature (< -35 C) °C

The AD double wiper seal featuring a Slipper Seal design consists of a PTFE slide ring for the wiper function and an elastomer O-ring as a preloading element. It combines two functions: wiping against external contamination and a sealing function that reduces the residual oil film. The AD wiper seal is characterized by low break-away and sliding friction and can therefore be used in low-lube conditions as well.

Due to the material combination of the slide ring (PTFE) and the O-ring (elastomer), this product is suitable for a wide range of applications, especially for aggressive media and/or high temperatures. Several compounds can alternatively be selected according to the specific application profile.

Wiper rings / seals serve to safeguard axially movable rods and pistons against ingress of dust, dirt, sand and swarf, thus protecting the guiding elements and seals and extending the service life of the sealing system.

  • Excellent wear resistance.
  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
  • Good energy efficiency due to low friction.
  • High temperature resistance assured by suitable O-Ring compound selection.
  • Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and large O-Ring compound selection.
  • Dimensions according to DIN ISO 6195, Type D.
  • Available in diameters from 4 to 3000 mm.
  • Installation in closed and undercut housings.

Range of application:

  • The AD product series is suitable for a wide range of applications, especially for aggressive media and/or high temperatures.

The AD wiper seal is available in the following compounds:

  • 00591 – Industrial applications
  • 00592 – High temperatures
  • 00593 – Low temperatures
Wiper Seal Prädifa series AH

Wiper Seal Prädifa series AH

Media: Hydraulic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -35 °C

Maximum Operating Temperature: 100 °C

Maximum Surface Speed: 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C

The Ultrathan® AH double wiper seal serves to prevent ingress of dust, dirt, sand and swarf into hydraulic cylinders. This reduces the risk of scoring on the piston rod caused by external contaminants embedded in the guidance. The good wiping effect is achieved by the special design of the wiper lip. In addition, the sealing lip facing the medium reduces the residual oil film. The proven Ultrathan® P5008 compound stands for high abrasion resistance, minor permanent deformation, and robustness against external mechanical impact. The wiper seal is securely held in place in the axially open installation housing by means of a press fit of the metal case vis-à-vis the inner diameter of the groove.

  • Robust seal profile for harshest operating conditions.
  • Extreme wear resistance.
  • Suitable for fully automatic installation
  • Product geometry prevents dirt deposits at the front face of the cylinder.
  • Simple fabrication of the housing.

Range of application:

  • Hydraulic cylinders
Double wiper seal Prädifa series AV

Double wiper seal Prädifa series AV

Media: Hydraulic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -35 °C

Maximum Operating Temperature: 100 °C

Maximum Surface Speed: 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C

The Ultrathan® AV double wiper seal serves to prevent ingress of dust, dirt, sand and swarf into hydraulic cylinders. The dirt shield formed on the wiper prevents moisture from migrating underneath the wiper into the groove, thus preventing corrosion which frequently occurs in the groove. The good wiping effect is achieved by the special design of the wiper lip. The proven Ultrathan® P5008 compound stands for high abrasion resistance, minor permanent deformation, and robustness against external mechanical impact. Due to the press fit in the groove and a pressure relief hole the risk of the wiper being extruded from the cylinder housing is minimized.

  • Robust seal profile for harshest operating conditions.
  • Extreme wear resistance.
  • Suitable for fully automatic installation
  • Product geometry prevents dirt deposits at the front face of the cylinder.
  • Simple fabrication of the housing.

Range of application:

  • The AV wiper seal is used in hydraulic cylinders and is particularly well-suited for mobile applications.
Double wiper seal Prädifa series AY

Double wiper seal Prädifa series AY

Media: Hydraulic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Fluorocarbon Rubber (FKM, FPM)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -45 to -20 °C

Maximum Operating Temperature: 80 to 200 °C

Maximum Surface Speed: 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C, Low Temperature (< -35 C) °C, High Temperature (< 205 C) °C

The wear-resistant Ultrathan AY double wiper ring serves to prevent ingress of dust, dirt, sand and swarf. This is achieved by its special design which largely prevents scoring, protects the guiding parts and extends the service life of the seals. In addition, the sealing lip facing the media side reduces the residual oil film. The AY double wiper ring closes the cylinder vis-à-vis the environment. The AY wiper seal can be installed in undercut grooves without requiring special screwrings or brackets. In addition to higher wear resistance, the utilization of polyurethane offers good resistance against ozone and UV radiation. When PTFE rod seals are used we recommend the combination with the Ultrathan AY wiper seal to minimize the residual oil film.

  • Extreme wear 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 DIN ISO 6195, Type C.
  • Installation in closed and undercut housings.
  • Further dimensions of machined series with short lead times available.

Range of application:

  • For axially operated rods in hydraulic and pneumatic working cylinders, tappets and rod guidances.

The AV double wiper seal is available in the following compounds:

  • P5008 – Heavy-duty
  • P6000 – Heavy-duty / high temperatures
  • V3664 – High temperatures
  • P5009 – Low temperatures
  • P5001 – Bio-degradable fluids
  • P5000 – FDA approved
Rod seal/wiper Prädifa series EL

Rod seal/wiper Prädifa series EL

Media: Pneumatic

Polymer Material Options: Ethylene Propylene Rubber (EPM, EPR, EPDM), Hydrogenated Nitrile Butadiene Rubber (HNBR, HSN), Nitrile Butadiene Rubber (NBR, XNBR), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Fluorocarbon Rubber (FKM, FPM)

Maximum Operating Pressure: 10, 16 bar

Minimum Operating Temperature: -50 to -10 °C

Maximum Operating Temperature: 80 to 200 °C

Maximum Surface Speed: 1, <1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Expanded Low and High Temperature (< -35 C to 140 C) °C, Low Temperature (< -35 C) °C, High Temperature (< 205 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Pressure Rating: Pneumatic Pressure (< 16 bar) bar

The EL pneumatic seal/wiper ring is a proven combination element for sealing piston rods in compact pneumatic cylinders and valve lifters. The EL product series is available in both Ultrathan® and rubber versions. The Ultrathan® versions are characterized by extremely high wear resistance.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Bi-functional element: seal and wiper.
  • Extreme wear resistance.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • Excellent media resistance in case of suitable compound selection.
  • Short axial assembly length.
  • Installation in closed and undercut housings.
  • The coordinated geometries of the seal and wiper lips achieve favorable friction coefficients and long service life.

Range of application:

  • Pneumatic cylinders

The EL rod seal/wiper is available in the following compounds:

  • N3582 – Industrial applications
  • V3639 – High temperatures
  • P5008 – Heavy-duty
  • N8613 – Low temperatures
Rod seal/wiper Prädifa series EM

Rod seal/wiper Prädifa series EM

Media: Pneumatic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Fluorocarbon Rubber (FKM, FPM), Hydrogenated Nitrile Butadiene Rubber (HNBR, HSN), Ethylene Propylene Rubber (EPM, EPR, EPDM)

Maximum Operating Pressure: 10, 16 bar

Minimum Operating Temperature: -50 to -20 °C

Maximum Operating Temperature: 80 to 200 °C

Maximum Surface Speed: 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C, Low Temperature (< -35 C) °C, High Temperature (< 205 C) °C, Expanded Low and High Temperature (< -35 C to 140 C) °C

Pressure Rating: Pneumatic Pressure (< 16 bar) bar

The EM rod seal/wiper ring for pneumatic applications is a proven combination element for sealing piston rods in compact pneumatic cylinders and valve lifters. The special design using a wear-resistant Ultrathan® compound enables installation in smallest grooves for extremely low break-away and dynamic friction.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Bi-functional element: seal and wiper.
  • Extreme wear resistance.
  • Low static and dynamic friction thanks to miniaturized design.
  • Smooth running due to optimum adjustment of the functional lips.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • Excellent media resistance in case of suitable compound selection.
  • Short axial assembly length.
  • Short radial assembly depth.
  • Installation in closed and undercut housings.
  • Low compression set.
  • The coordinated geometries of the seal and wiper lips achieve favourable friction coefficients and long service life.

Range of application:

  • Rod seal/wiper for mini-pneumatics.

The EM rod seal/wiper is available in the following compounds:

  • P5010 – Heavy-duty
  • P5011 – Bio-degradable media
  • P5009 – Heavy duty/low temperatures
  • V3839 – High temperatures
  • N3578 – Industrial applications
Rod seal/wiper Prädifa series EN

Rod seal/wiper Prädifa series EN

Media: Pneumatic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 16 bar

Minimum Operating Temperature: -35 to -20 °C

Maximum Operating Temperature: 80 to 100 °C

Maximum Surface Speed: 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C

Pressure Rating: Pneumatic Pressure (< 16 bar) bar

The self-retaining Ultrathan® EN rod seal/wiper ring for piston rods of pneumatic cylinders performs two functions: sealing and wiping. The Ultrathan® compound is characterized by extremely high wear resistance. The dirt shield formed at the wiper prevents moisture from migrating underneath the seal into the groove. As a result, corrosion which frequently occurs inside the groove can be avoided. In addition, due to the absence of undercuts and dead spaces, the assembly space in front of the seal is easy to clean. This makes the EN seal/wiper ring particularly well suited for food and pharmaceutical production and for all other applications requiring easy- to-clean components.

  • Bi-functional element: seal and wiper.
  • Robust seal profile for harshest operating conditions.
  • Extreme wear resistance.
  • No risk of corrosion since the combined retainer and wiper part eliminates the need for additional wire circlips.
  • Long service life due to coordinated geometries of the functional lips and compound selection.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • Excellent media resistance in case of suitable compound selection.
  • Suitable compounds available for special requirements of the food processing industry.
  • Identical housing for E7, E8, E9, EU, EF, EN, EW and ET.
  • Installation in open housings.
  • Low compression set.
  • The coordinated geometries of the seal and wiper lips achieve favorable friction coefficients and long service life.
  • Product geometry prevents dirt deposits at the front face of the cylinder.

Range of application:

  • The EN rod seal/wiper has been developed for hygienically sensitive applications, such as clean room technology, medical device technology, pharmaceuticals and food applications.

The EN rod seal/wiper is available in the following compounds:

  • P5008 – Heavy-duty
  • P5000 – Food applications (FDA approval)
Rod seal, wiper and guiding element Prädifa series EP

Rod seal, wiper and guiding element Prädifa series EP

Media: Pneumatic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 16 bar

Minimum Operating Temperature: -35 to -20 °C

Maximum Operating Temperature: 100 °C

Maximum Surface Speed: 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No                

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C

Pressure Rating: Pneumatic Pressure (< 16 bar) bar

The EP pneumatic rod seal/wiper and guiding element for piston rods of pneumatic cylinders performs three functions: sealing, wiping and guiding. The Ultrathan® compound is characterized by extremely high wear resistance. The multi-component design of the EP profile with an aluminum cage enables very easy installation by axial press-fit into the cylinder head.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Multi-functional element: seal, wiper and guiding element.
  • Extreme wear resistance.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • Simple fabrication of the housing.
  • Short radial assembly depth.
  • Low compression set.
  • The coordinated geometries of the seal and wiper lips achieve favorable friction coefficients and long service life.
  • Multi-functionality provides warehousing cost benefits.

Range of application:

  • Pneumatic cylinders
Rod seal/wiper Prädifa series ET

Rod seal/wiper Prädifa series ET

Media: Pneumatic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 10 bar

Minimum Operating Temperature: -35 to -25 °C

Maximum Operating Temperature: 80 to 85 °C

Maximum Surface Speed: 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C

Pressure Rating: Pneumatic Pressure (< 16 bar) bar

The self-retaining ET Ultrathan® seal/wiper for flattened piston rods of non-rotating pneumatic cylinders is the oval counterpart of the round standard EU profile. It performs two functions: sealing and wiping. The Utrathan® material is characterized by extremely high wear resistance.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Bi-functional element: seal and wiper.
  • Extreme wear resistance.
  • No risk of corrosion since the combined retainer and wiper part eliminates the need for additional wire circles.
  • Long service life due to coordinated geometries of the functional lips and compound selection.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • Excellent media resistance in case of suitable compound selection.
  • Identical housing for E7, E8, E9, EU, EF and ET.
  • Installation in open housings.
  • Low compression set.
  • The coordinated geometries of the seal and wiper lips achieve favorable friction coefficients and long service life.

Range of application:

  • For flattened rods of pneumatic cylinders protected against rotation.

The ET rod seal/wiper is available in the following compounds:

  • P5008 – Industrial applications
  • P5009 – Industrial applications/low temperatures
  • P5000 – Food applications (FDA approval)
  • P5001 – Bio-degradable media
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Rod seal/wiper Prädifa series EU

Media: Pneumatic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 16 bar

Minimum Operating Temperature: -45 to -20 °C

Maximum Operating Temperature: 80 to 100 °C

Maximum Surface Speed: 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C, Low Temperature (< -35 C) °C

Pressure Rating: Pneumatic Pressure (< 16 bar) bar

The EU self-retaining Ultrathan® seal/wiper performs two functions: sealing and wiping. The Ultrathan® material is characterized by extremely high wear resistance.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Bi-functional element: seal and wiper.
  • Robust seal profile for harshest operating conditions.
  • Extreme wear resistance.
  • No risk of corrosion since the combined retainer and wiper part eliminates the need for additional wire circles.
  • Long service life due to coordinated geometries of the functional lips and compound selection.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • Excellent media resistance in case of suitable compound selection.
  • Identical housing for E7, E8, E9, EU, EF and ET.
  • Installation in open housings.
  • Low compression set.
  • The coordinated geometries of the seal and wiper lips achieve favourable friction coefficients and long service life.

Range of application:

  • For piston rods in pneumatic cylinders.

The EU rod seal/wiper is available in the following compounds:

  • P5008 – Industrial applications
  • P5009 – Industrial applications/low temperatures
  • P5000 – Food applications (FDA approval)
  • P5001 – Bio-degradable media
ay_zm (1)

Double-Acting Rod Wiper Seals for Hydraulic Applications (AY)

Shoulder Diameter: 0.370 to 10.135 inch; 22.5 to 164.0 mm

Maximum Width: Max axial wiper width from 0.245 to 0.351 inch; 4.8 to 9.5 mm inch

Minimum Operating Temperature: -35 °F

Maximum Operating Temperature: 275 °F

For Fluid Type: Petroleum base hydraulic oil, Water, depending on material

Colour: Tan, Aqua

Durometer: 90 Shore A

Thermal Application Type: Varies depending on material

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Media: Hydraulic

Maximum Surface Speed: 100 (0.5 m/s) ft/min

A sampling of Parker’s part numbers are shown in the configurator above for select materials and sizes. If the material and dimensions required are not shown, assistance with part number configuration may be found in the literature documents in the Product Support tab. To check current tooling, review the Part Number Look-up document. Contact Parker for requirements outside typical ranges. Parker’s AY profile, premium double-lip wiper is used in light to heavy-duty hydraulics. When used in high pressure applications with the proper Parker rod seals, the AY profile complements the sealing system by providing an additional beveled sealing lip, yielding excellent film-breaking and the driest rod sealing available. These dual acting features along with its space-saving single-gland configuration, enable it to be used by itself in low pressure applications as both the rod seal and the wiper. Knife-trimmed sealing lips ensure the best possible film breaking.

NOTE: When using the AY wiper in conjunction with other rod seals, it is important to select a rod seal profile that enables pressure relief of fluid into the system, otherwise a pressure trap may form between the wiper and rod seal. Suggested rod profiles are Parker’s BT Profile, BS Profile, and B3 Profile U-cup seals.

Standard Materials:

  • P4300A90 Resilon® polyurethane; Temp -65 / +275F; Surface speed <1.6 ft/s
  • P4301A90 Resilon polyurethane; Temp -35 / +275F (+225F in water); Surface speed <1.6 ft/s
  • P4700A90 Polyurethane; Temp -65 / +200F; Surface speed <1.6 ft/s

Alternate Materials: For applications that may require an alternate material, please contact your Parker EPS representative.

Note: Metric dimensions according to DIN ISO 6195, Type C.

Typical applications:

  • Dynamic sealing of hydraulic cylinders
Single-Acting Rod Wiper Seal for Hydraulics (J)

Single-Acting Rod Wiper Seal for Hydraulics (J)

Groove Width: 0.312, 0.375 inch

Minimum Operating Temperature: -65 °F

Maximum Operating Temperature: 275 °F

For Fluid Type: Petroleum based hydraulic oil

Colour: Black, Tan, Green

Thermal Application Type: Varies depending on material

Durometer: 88 to 90 Shore A, 60 Shore D

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Media: Hydraulic

Unit of Measure: Length: inch

Maximum Surface Speed: 100 (0.5 m/s) ft/min

A sampling of Parker’s part numbers are shown in the configurator above for select materials and sizes. If the material and dimensions required are not shown, assistance with part number configuration may be found in the literature documents in the Product Support tab.  To check current tooling, review the Part Number Look-up document in the Product Support tab.  Contact Parker for requirements outside typical ranges.

Parker’s J Profile is a single-acting rod wiper for hydraulics.  Its polyurethane and metal can construction facilitates press-fit installation to guard against O.D. contamination and results in simple counter-bore groove machining.  The wiping lip on the J profile wiper is very aggressive, eliminating the ingression of dust, mud and moisture from harsh work areas.  J Profile wipers are ideal for medium and heavy duty hydraulic cylinders in the most demanding applications. 

Standard Materials:

  • P4700A90 Polyurethane; Temp -65 / +200F; Surface speed
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Single-Acting Rod Wiper Seal for Pneumatics and Hydraulics (SHD)

Gland Depth: 0.124 to 0.499 inch

Groove Width: 0.124 to 0.499 inch

Shoulder Diameter: 0.410 to 32.093 inch

Maximum Width: Max Wiper Axial Width: 0.215 to 0.820 inch

Minimum Operating Temperature: -70 °F

Maximum Operating Temperature: 400 °F

For Fluid Type: Varies depending on material

Durometer: 70 to 95 Shore A, 53 to 60 Shore D

Color: Varies depending on material

Thermal Application Type: Varies depending on material

Polymer Material Options: Hydrogenated Nitrile Butadiene Rubber (HNBR, HSN), Fluorocarbon Rubber (FKM, FPM), High Performance Fluoroelastomer (HiFluor®), Nitrile Butadiene Rubber (NBR, XNBR), Thermoplastic Copolyester Elastomer (TPC, TPE), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Specifications Met: none, API 6A (FF/HH) (10% Sour Gas)

Media: Hydraulic, Multiple

Unit of Measure: Length: inch

Maximum Surface Speed: 100 (0.5 m/s) ft/min

A sampling of Parker’s part numbers are shown in the configurator above for select materials and sizes.   If the material and dimensions required are not shown, assistance with part number configuration may be found in the literature documents in the Product Support tab.  To check current tooling, review the Part Number Look-up document.  Contact Parker for requirements outside typical ranges.

Parker’s SHD Profile wiper seals is an outstanding choice for light and medium duty hydraulic and pneumatic applications.  The slotted heel design prevents pressure traps from forming between the rod seal and wiper. The snap-in design is oversized, ensuring a snug fit, excellent stability, and that the wiper lip maintains contact with the rod at all times.   This makes the SHD Profile a great all-round industrial snap-in wiper that retrofits many typical commercial glands. Parker offers broad tooling availability, up to 30″, making the SHD a good choice for large rod diameters. 

Standard Materials:

  • P4615A90 Molythane®; Temp -65 / +200F; Surface Speed
Single-Acting Rod Wiper Seal for Hydraulics (YD)

Single-Acting Rod Wiper Seal for Hydraulics (YD)

Shoulder Diameter: 0.410 to 30.659 inch

Maximum Width: Max Wiper Axial Width: 0.215 to 0.820 inch

Minimum Operating Temperature: -65 °F

Maximum Operating Temperature: 275 °F

Seal Material: P4300A90

For Fluid Type: Petroleum base hydraulic oil

Colour: Tan

Durometer: 75 to 90 Shore A

Thermal Application Type: Expanded low and high temperature (<-30F, >250F) °F

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Media: Hydraulic

Unit of Measure: Length: inch

Maximum Surface Speed: 100 (m/s) ft/min

A sampling of Parker’s part numbers are shown in the configurator above for select materials and sizes. If the material and dimensions required are not shown, assistance with part number configuration may be found in the literature documents in the Product Support tab.  To check current tooling, review the Part Number Look-up document.  Contact Parker for requirements outside typical ranges. Parker’s YD Profile wiper seals are the premier design among high performance, snap-in excluders for medium to heavy-duty hydraulics.  Designed for optimum stability and ultimate performance, the YD profile incorporates an aggressive, knife-trimmed wiping lip that maintains contact with the housing at all times to ensure maximum exclusion along the rod.  A true zero-radius lip provides the most effective wiping action available.  The YD Profile’s secondary outside diameter lip seals against the shoulder of the gland, preventing water and other contaminants from entering the static side of the wiper. 

Standard Materials:

  • P4300A90 Resilon® polyurethane; Temp -65 / +275F; Surface speed
Wiper seal Prädifa series AM

Wiper seal Prädifa series AM

Thermal Application Type: Expanded Low and High Temperature (< -35 C to 140 C) °C, High Temperature (< 205 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Hydraulic Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR), Fluorocarbon Rubber (FKM, FPM), Ethylene Propylene Rubber (EPM, EPR, EPDM)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -50 to -25 °C

Maximum Operating Temperature: 100 to 200 °C

Maximum Surface Speed: 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

The AM wiper seal serves to prevent ingress of dust, dirt, sand and swarf. This is achieved by its special design which largely prevents scoring, protects the guiding parts and extends the service life of the seals. An oversized diameter ensures interference fit in the groove recess, thus preventing ingress of foreign particles at the wiper’s outer diameter. The wiper ring of the AM product series can simply be press-fit into the cylinder liner and requires no special retention rings.

  • Good wear resistance.
  • Suitable for fully automatic installation.
  • High temperature resistance in case of suitable compound selection.
  • Excellent media resistance in case of suitable compound selection.

Range of application:

  • Hydraulic and pneumatic cylinders, valve lifters, etc.

The AM wiper seal is available in the following compounds:

  • Z5053 – Industrial applications
  • Z5066 – High temperatures
Wiper seal Prädifa series A6

Wiper seal Prädifa series A6

Thermal Application Type: High Temperature (< 205 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Hydraulic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR), Fluorocarbon Rubber (FKM, FPM)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -20 to -10 °C

Maximum Operating Temperature: 80 to 200 °C

Maximum Surface Speed: 4, 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

The A6 wiper seal serves to prevent ingress of dust, dirt, sand and swarf. This is achieved by its special design which largely prevents scoring, protects the guiding parts and extends the service life of the seals. The wiper seal requires no tight fit due to its integrated dirt shield which ensures operating reliability even in the case of coaxiality fluctuations of up to 1.5 mm, depending on the rod diameter.

  • Outstanding wiper properties for excentricity of the cylinder rod.
  • Good wear resistance.
  • Smooth running due to optimum adjustment of the functional lips.
  • Easy snap assembly without assembly aids.
  • High temperature resistance in case of suitable compound selection.
  • Product geometry prevents dirt deposits at the front face of the cylinder.
  • Installation in closed and undercut housings.

Range of application:

The wiper ring of the A6 product series has been developed for axially operated rods in hydraulic and pneumatic working cylinders, plungers and rod guidance. It delivers enhanced performance in applications where excentricity occurs vis-à-vis the groove, with eccentricity of up to 1.5 mm being permissible.

Rod seal/wiper Prädifa series EW

Rod seal/wiper Prädifa series EW

Media: Pneumatic

Polymer Material Options: Fluorocarbon Rubber (FKM, FPM)

Maximum Operating Pressure: 16 bar

Minimum Operating Temperature: -10 °C

Maximum Operating Temperature: 150 °C

Maximum Surface Speed: 1 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

Thermal Application Type: High Temperature (< 205 C) °C

Pressure Rating: Pneumatic Pressure (< 16 bar) bar

The self-retaining EW seal/wiper combines the properties of the proven E9 high-temperature seal with a metallic wiper for particularly dirt-prone and harsh environments. Thus, the EW seal/wiper provides a scraper function in addition to the sealing function. It is used for scraping strongly adhering particles off the cylinder rod, thereby protecting the seal against excessive wear. The combination of the metallic wiper and wear-resistant sealing compound achieves considerably longer service life.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Bi-functional element: seal and wiper.
  • Good wear resistance.
  • Robust seal profile for harshest operating conditions.
  • High temperature resistance in case of suitable compound selection.
  • Excellent media resistance in case of suitable compound selection.
  • Identical housing for E7, E8, E9, EU, EF, EN, EW, ET.
  • Easy snap assembly with assembly aids.

Range of application:

  • The seal/wiper EW is suitable for use in environments that are particularly prone to dirt and in high temperatures, such as crust breaker cylinders, which are used in aluminum production.
A5_zm

Wiper seal Prädifa series A5

Thermal Application Type: Standard moderate Temperature (-35 C to 100 C) °C, High Temperature (< 205 C) °C, Expanded Low and High Temperature (< -35 C to 140 C) °C

Media: Hydraulic

Polymer Material Options: Ethylene Propylene Rubber (EPM, EPR, EPDM), Nitrile Butadiene Rubber (NBR, XNBR), Fluorocarbon Rubber (FKM, FPM), Thermoplastic Copolyester Elastomer (TPC, TPE), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 0 bar

Maximum Operating Temperature: 80 to 200 °C

Maximum Surface Speed: 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

The A5 wiper ring serves to prevent ingress of dust, dirt, sand and swarf. This is achieved by its special design which largely prevents scoring, protects the guiding parts and extends the service life of the seals. An oversized outer diameter ensures interference fit in the groove, thus preventing ingress of foreign particles and moisture via the static seal fit of the wiper. The A5 wiper seal is available in both Ultrathan and rubber compounds. The Ultrathan® versions are characterized by extremely high wear resistance.

  • Good wear resistance.
  • High temperature resistance in case of suitable compound selection.
  • 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 DIN ISO 6195, Type E.
  • Product geometry prevents dirt deposits at the front face of the cylinder.
  • Installation in closed and undercut housings.

Range of application:

  • The A5 wiper ring is used for axially operated rods in hydraulic and pneumatic working cylinders, plungers and rod guidance.

The A5 wiper seal is available in the following compounds:

  • N3587 – Industrial applications
  • P5004 – Heavy-duty
  • V3839 – Low temperatures
  • P5000 – FDA-approved
  • P5000 – Bio-degradable fluids
Wiper seal Prädifa series AF

Wiper seal Prädifa series AF

Thermal Application Type: Low Temperature (< -35 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Hydraulic

Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -45 to -20 °C

Maximum Operating Temperature: 85 to 105 °C

Maximum Surface Speed: 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

The wear-resistant Ultrathan AF wiper seal / ring serves to prevent ingress of dust, dirt, sand and swarf into the hydraulic cylinder. This reduces the risk of scoring on the piston rod caused by external contamination embedded in the guidance. The good wiping effect is achieved by the special design of the wiper lip. The proven P5008 polyurethane compound stands for abrasion resistance, minor permanent deformation and robustness against external mechanical impact. The wiper seal is securely held in place in the axially open groove via press-fit of the metal jacket vis-à-vis the inner groove diameter. As the wiper lip is flush with the cylinder head it is largely protected against external mechanical damage.

  • Robust seal profile for harshest operating conditions.
  • Extreme wear resistance.
  • Suitable for fully automatic installation
  • Dimensions according to DIN ISO 6195, Type B.
  • Simple fabrication of the housing.

Range of application:

  • Hydraulic cylinders and valve tappets
Wiper seal Prädifa series A7

Wiper seal Prädifa series A7

Thermal Application Type: Expanded Low and High Temperature (< -35 C to 140 C) °C, High Temperature (< 205 C) °C, Standard moderate Temperature (-35 C to 100 C) °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

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.
Wiper seal Prädifa series A2

Wiper seal Prädifa series A2

Thermal Application Type: High Temperature (< 205 C) °C, Low Temperature (< -35 C) °C, Expanded Low and High Temperature (< -35 C to 140 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Pneumatic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR), Fluorocarbon Rubber (FKM, FPM), Hydrogenated Nitrile Butadiene Rubber (HNBR, HSN), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -50 to -20 °C

Maximum Operating Temperature: 80 to 200 °C

Maximum Surface Speed: 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

The A2 wiper seal / ring serves to prevent ingress of dust, dirt, sand and swarf into dynamic rod guides. This is achieved by its special shape, which largely prevents scoring, protects the guidance parts and extends the service life of the seals. The wiper seal has been specifically developed for pneumatic equipment operated with dry and oil-free compressed air. Initial pre-assembly lubrication is a prequisite for impeccable performance. An oversized outer diameter ensures interference fit in the groove and thus prevents intrusion of foreign particles and moisture on the wiper’s outer diameter.

  • Good wear resistance.
  • Smooth running due to optimum lubricant-retaining sealing lip geometry.
  • High temperature resistance in case of suitable compound selection.
  • Excellent media resistance in case of suitable compound selection.
  • Product geometry prevents dirt deposits at the front face of the cylinder.
  • Installation in closed and undercut housings.

Range of application:

  • Suitable for axially operated rods in pneumatic working cylinders, plungers and rod guides.

The A2 wiper seal is available in the following compounds:

  • N3587 – Industrial applications
  • V3664 – High temperatures
  • N8613 – Low temperatures
  • P5008 – Heavy-duty
Wiper seal Prädifa series A1

Wiper seal Prädifa series A1

Thermal Application Type: High Temperature (< 205 C) °C, Low Temperature (< -35 C) °C, Expanded Low and High Temperature (< -35 C to 140 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Hydraulic

Polymer Material Options: Nitrile Butadiene Rubber (NBR, XNBR), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Fluorocarbon Rubber (FKM, FPM), Polyoxymethylene (POM), Ethylene Propylene Rubber (EPM, EPR, EPDM)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -50 to -10 °C

Maximum Operating Temperature: 80 to 200 °C

Maximum Surface Speed: 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

The A1 wiper seal / ring serves to prevent ingress of dust, dirt, sand and swarf.  This is achieved by its special design which largely prevents scoring, protects the guiding parts and extends the service life of the seals. An oversized outer diameter ensures interference fit in the groove, thus preventing ingress of foreign particles and moisture via the static seal fit of the wiper. The A1 wiper seal is available in both Ultrathan® and rubber compounds. The Ultrathan versions are characterized by extremely high wear resistance.

Product Benefits:

  • Good wear resistance.
  • High temperature resistance in case of suitable compound selection.
  • 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 DIN ISO 6195, Type E.
  • Product geometry prevents dirt deposits at the front face of the cylinder.
  • Installation in closed and undercut housings.

Range of Application:

  • Axially operated rods in hydraulic and pneumatic working cylinders, plungers and rod guidances.

The A1 wiper seal is available in the following compounds:

  • N3587 – Industrial applications
  • P5008 – Heavy-duty
  • V3664 – High temperatures
  • P5009 – Low temperatures
  • P5001 – Bio-degradable fluids
  • P5000 – FDA-approved
Wiper seal Prädifa series AT

Wiper seal Prädifa series AT

Thermal Application Type: High Temperature (< 205 C) °C, Standard moderate Temperature (-35 C to 100 C) °C

Media: Hydraulic

Polymer Material Options: Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®), Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®), Ultra-High Molecular Weight Polyethylene (UHMW-PE)

Maximum Operating Pressure: 0 bar

Minimum Operating Temperature: -200 to -20 °C

Maximum Operating Temperature: 80 to 230 °C

Maximum Surface Speed: 4, 2 m/sec

Unit of Measure: Length: mm

Cushioning Mechanism: No

The AT wiper seal featuring a Slipper Seal design consists of a PTFE slide ring for the wiper function and an elastomer O-ring as a preloading element. The AT wiper seal is characterized by low break-away and sliding friction and can therefore be used in low-lube conditions as well. Due to the material combination of the slide ring (PTFE) and the O-ring (elastomer), this product is suitable for a wide range of applications, especially for aggressive media and/or high temperatures. Several compounds can alternatively be selected according to the specific application profile. Wiper rings serve to safeguard axially movable rods and pistons against ingress of dust, dirt, sand and swarf, thus protecting the guiding elements and seals and extending the service life of the sealing system.

  • Excellent wear resistance.
  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
  • Good energy efficiency due to low friction.
  • High temperature resistance assured by suitable O-ring compound selection.
  • Adaptable to nearly all media thanks to high chemical resistance of the sealing ring and large O-ring compound selection.
  • Dimensions according to DIN ISO 6195, Type D.
  • Installation in closed and undercut housings.
  • Available in diameters from 4 to 3000 mm.
  • Additional sizes of machined products available on short notice.

Range of application:

The material combination of the slipper ring (PTFE) and the O-ring (elastomer) makes this product suitable for a wide range of applications, especially for aggressive media and/or high temperatures. Multiple compounds can alternatively be selected according to the individual application profile.

The AT wiper seal is available in the following compounds:

  • 00591 – Industrial purpose
  • 00592 – High temperature
Rod seal/wiper Prädifa series E7

Rod seal/wiper Prädifa series E7

For Fluid Type: Pneumatic

Polymer Material Options: Ultra-High Molecular Weight Polyethylene (UHMW-PE), Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®), Polyketone (PK, nobrox®)

Operating Pressure: 16 bar

Operating Temperature: -30 to 80 °C, -35 to 200 °C, -30 to 120 °C

Maximum Surface Speed: 1

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 to 100) °C

Pressure Rating: Pneumatic Pressure (< 16) bar

The self-retaining E7 rod seal/wiper is a version of the profile EU for extreme working conditions with regard to temperature and chemical resistance and dry running.

It performs three functions simultaneously: Sealing, wiping, fixing.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Bi-functional element: seal and wiper.
  • No risk of corrosion since the combined retainer and wiper part eliminates the need for additional wire circlips.
  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
  • Easy snap assembly without assembly aids.
  • Product geometry prevents dirt deposits at the front face of the cylinder.
  • Identical housing for E7, E8, E9, EU, EF, EN, EW and ET.

Range of application:

  • For pneumatic cylinder piston rods.

Prädifa series E7 is available in the following compounds:

  • PS006 – Standard
  • PS074 – For higher temperatures and/or chemical resistance requirements (but with slightly reduced service life).
Rod seal/wiper Prädifa series E7

Rod seal/wiper Prädifa series E7

For Fluid Type: Pneumatic

Polymer Material Options: Ultra-High Molecular Weight Polyethylene (UHMW-PE), Polytetrafluoroethylene (PTFE, mPTFE, TFM, Polon®), Polyketone (PK, nobrox®)

Operating Pressure: 16 bar

Operating Temperature: -30 to 80 °C, -35 to 200 °C, -30 to 120 °C

Maximum Surface Speed: 1

Cushioning Mechanism: No

Thermal Application Type: Standard moderate Temperature (-35 to 100) °C

Pressure Rating: Pneumatic Pressure (< 16) bar

The self-retaining E7 rod seal/wiper is a version of the profile EU for extreme working conditions with regard to temperature and chemical resistance and dry running.

It performs three functions simultaneously: Sealing, wiping, fixing.

  • Due to application-optimized geometry and compounds suitable for use in oiled as well as in oil-free air (after initial lubrication on assembly).
  • Bi-functional element: seal and wiper.
  • No risk of corrosion since the combined retainer and wiper part eliminates the need for additional wire circlips.
  • Minimal break-away and dynamic friction and no stick-slip tendency ensures uniform motion even at low speeds.
  • Easy snap assembly without assembly aids.
  • Product geometry prevents dirt deposits at the front face of the cylinder.
  • Identical housing for E7, E8, E9, EU, EF, EN, EW and ET.

Range of application:

  • For pneumatic cylinder piston rods.

Prädifa series E7 is available in the following compounds:

  • PS006 – Standard
  • PS074 – For higher temperatures and/or chemical resistance requirements (but with slightly reduced service life).