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Parker Metric Seals

Parker Metric Seals

Parker’s extensive portfolio of sealing profiles, compounds and dimensions for precision hydraulic sealing is the result of many years of development and field experience gained in the various sectors of mechanical engineering. The profiles, materials and sizes shown here as Preferred Profiles were selected based on existing ISO standards and recommended suitability for a broad range of applications.

Click a profile for more details:

AY Cross Section
Metric BP Cross-Section


BT Profile, Premium U-cup Rod Seal with Secondary Stabilizing Lip

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The BT profile is a non-symmetrical design for use in hydraulic rod sealing applications. Using Finite Element Analysis, the BT profile was designed to provide improved sealing performance and stability in the gland. A knife trimming process is used to form the beveled lip which is best for removing fluid from the rod. By design, the BT profile has a more robust primary sealing lip than the BS profile and the stabilizing lip is located at the base of the heel. The standard compound for the BT profile is Parker’s proprietary Resilon® polyurethane compound. The BT profile provides long life, extrusion resistance, low compression set, shock load resistance and increased sealing performance at zero pressure. The BT profile is designed for use as a stand alone rod seal or for use with the BR or OD profile buffer seals for more critical sealing applications.

Technical Data

Standard Materials*TemperatureMax. Pressure Range**
P4617D65-65°F to +250°F
(-54°C to +121°C)
10,000 psi
(689 bar)
Z4652D65-65°F to +275°F
(-54°C to +135°C)
10,000 psi
(689 bar)

*Dimensions: according to ISO 5597.
†Pressure Range: without wear rings.


AY Profile, Double-Lip Wiper
AY Cross Section

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The AY profile can be used as a heavy to light duty wiper. When used in high pressure applications with the proper Parker rod seals, the AY 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 also 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. IMPORTANT: 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 seal profile is BT Profile u-cup.

Technical Data

Standard MaterialsTemperatureMax. Pressure Range**
Z4651D60-65°F to +275°F
(-54°C to +135°C)
7,000 psi
(482 bar)

Dimensions: according to DIN ISO 6195, Type C.


BP Profile, Premium TPU Cap Seal
Metric BP Cross-Section

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Parker’s metric BP profile is a double-acting, squeeze type, piston seal for use in medium to heavy duty hydraulic applications. The standard material combination for the profile’s components are a TPU cap in Resilon® 4304 polyurethane with improved sliding and high modulus, and a rectangular cross-section NBR elastomer energizer. The BP profile is easy to install on a single part piston. The unique cap design of the BP profile makes the seal insensitive to pressure spikes.

Technical Data

Standard Materials*TemperatureMax. Pressure Dynamic**Range Static
Z4651D60-65°F to +275°F
(-54°C to +135°C)
7,000 psi
(482 bar)
20,000 psi
(1,379 bar)

Dimensions: according to DIN ISO 6195, Type C.
†Pressure Range: without wear rings.


ESP – Parker “Seal Technology Center”

ESP International is proud to be one of the few premier distributors to qualify as a “Parker Seal Parker Distributor Seal Technology CenterTechnology Center (STC)”.

  • Proven Engineering Capability
  • ISO Quality Approval
  • Strong Financial Track Record

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