Parker Piston Seals

Hydraulic Piston Seals

ESP International is your source for a wide range of Parker piston seals to meet the broad demands of the fluid power industry. Parker’s piston seal profiles are available for both uni-directional and bi-directional applications. When combined with wear rings, Parker piston seals have proven to provide long life and leak free performance.

Piston profiles are fluid seals specifically designed to function in pneumatic and hydraulic cylinder applications. The outside diameter lip is designed to seal against the cylinder bore while the inside diameter lip is designed to seal the gland. For most non-symmetrical piston profiles, the size of the seal is slightly smaller in diameter than the gland diameter. When installed, the seal stretches into the gland to ensure a tight seal with the gland and improved stability in application.

Click a profile for more details:

BP – Premium TPU Cap Seal

The BP profile is a squeeze type, bi-directional piston seal for use in medium to heavy-duty hydraulic applications. This seal is primarily designed for linear applications but has been successfully used as a low-speed rotary seal. The BP profile’s geometry provides a fluid reservoir between the two sealing lips which holds system fluid, resulting in reduced breakaway and running friction. The standard style BP profile is designed to retrofit o-ring grooves. The BP profile is easy to install and will resist rolling and twisting in long stroke applications.

High Wear Resistance
Extrusion Resistance
Extended Temperature Range
Low Compression Set

Technical Data

Standard Materials	Temperature Range	Pressure Range	Surface Speed
Cap
P4304D60	-65°F to +275°F (-54°C to +135°C)	7000 psi (482 bar)	< 1.6 ft/s (0.5 m/s)
Energizer
A 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

PSP – TPU Piston Cap Seal

The PSP profile is a squeeze type, bi-directional piston seal for use in light to medium duty hydraulic applications. Available from proprietary Parker polyurethanes, the PSP offers low friction, abrasion and extrusion resistance. The nitrile elastomer energizer ensures resistance to compression set to increase seal life. The PSP profile’s geometry provides a fluid reservoir between the two sealing lips which holds system fluid, resulting in reduced breakaway and running friction. Designed to retrofit grooves for a single o-ring or an o-ring with two back-ups, the PSP profile is easy to install and resists rolling and twisting in long stroke applications.

Technical Data

Standard Materials	Temperature Range	Pressure Range	Surface Speed
Cap
P4622A90	65°F to +225°F (-54°C to +107°C)	5000 psi (344 bar)	< 1.6 ft/s (0.5 m/s)
Energizer
A 70A Nitrile	-30°F to +250°F (-34°C to +121°C)
Additional Cap Material
P4300A90	65°F to +225°F (-54°C to +107°C)	5000 psi (344 bar)	< 1.6 ft/s (0.5 m/s)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

CT – Premium PTFE Cap Seal with Anti-Extrusion Technology

The Parker CT profile is a robust design for heavy-duty hydraulic applications. The CT profile is an excellent choice for sealing mobile hydraulic applications that experience shock loads. The CT profile is a four piece assembly made up of a rubber energizer, PTFE cap and two backup rings. In application, fluid pressure forces the rubber energizer to apply increased load against the PTFE cap and back-up rings. This results in increased sealing force against the bore and allows the backup rings to close off the extrusion gap between the piston and the bore. Once activated by pressure, the back-up rings protect the seal from extruding and keep internal contamination away from the PTFE cap. Parker’s CT profile will retrofit non-Parker seals of similar design.

Technical Data

Standard Materials	*Temperature Range	Surface Speed
Cap
0401 - 40% bronze-filled PTFE	-200°F to +575°F (-129°C to +302°C)	< 5 ft/s (1.5 m/s)
Energizer
A 70A Nitrile	-30°F to +250°F (-34°C to +121°C)
Back-up Rings	Temperature Range	Pressure Range**
A Moly-filled Nylon	-65°F to +250°F (-44°C to +121°C)	7,500 psi (500 bar)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

OK – High-Pressure Split Cap Piston Seal

The OK profile is a bi-directional piston seal designed for heavy-duty hydraulic applications. Its durable, two-piece design installs easily onto a solid piston without the necessity of auxiliary tools. When installed into the bore, the diameter of the OK profile is compressed to close the step cut in the cap to provide excellent, drift free sealing performance. The glass-filled nylon sealing surface handles the toughest applications.

Shock Load Resistance
Contamination Resistance
High Wear Resistance
Extrusion Resistance
Long Life

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
Cap
W4650NHH	-65°F to +275°F (-54°C to +135°C)	7250 psi (500 bar)	< 3.3 ft/s (1.0 m/s)
Energizer
A 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

PIP Ring®- Loaded Lip Seal with Pressure Inverting Pedestal

The Parker PIP Ring® profile combines a “Pressure Inverting Pedestal” with a Type B PolyPak® to provide excellent, bi-directional piston sealing in hydraulic applications. The PIP Ring conforms to the beveled sealing lips of the Type B PolyPak to provide extrusion resistance when pressure is applied to the heel side of the seal. The PIP Ring profile requires only a single seal groove for installation. This eliminates the use of two PolyPak seals on the piston to save space and increase bearing length.

Technical Data

Standard Materials	Temperature Range	Pressure Range*	Surface Speed
Type B PolyPak
P4615A90	-65°F to +200°F (-54°C to +93°C)	5,000 psi (344 bar)	< 1.6 ft/s (0.5 m/s)
PIP Ring
P4617D65	-65°F to +250°F (-54°C to +121°C)	5,000 psi (344 bar)	< 1.6 ft/s (0.5 m/s)
Optional Materials
PIP Ring
Z4652D65	-65°F to +275°F (-54°C to +135°C)	10,000 psi** (689 bar)
W4685R119	-65°F to +500°F (-54°C to +260°C)	10,000+ psi (689 bar)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings. ††Dependent on entire assembly of PolyPak shell/energizer and PIP Ring.

B7 – U-cup Piston Seal

The B7 profile is a non-symmetrical, hydraulic cylinder piston seal. The knife trimmed, beveled lip contacts the bore to provide enhanced low to high-pressure sealing and wiping action. When installed, the diameter of the B7 profile is stretched slightly to fit the gland. This ensures a tight static seal with the gland and improves stability in application. The B7 profile is a uni-directional seal. Two seals can be placed on a piston, back-to-back, in separate glands, offering bi-directional fluid sealing.

Wear Resistance
Extrusion Resistance
Low Compression Set

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
P4300A90	-65°F to +275°F (-54°C to +135°C)	5,000 psi (344 bar)	< 1.6 ft/s (0.5 m/s)
P4301A90	-65°F to +275°F (-54°C to +135°C)	5000 psi (344 bar)	< 1.6 ft/s (0.5 m/s)
P4700A90	-65°F to +200°F (-54°C to +93°C)	5,000 psi (344 bar)	< 1.6 ft/s (0.5 m/s)
P5065A88	-70°F to +200°F (-57°C to +93°C)	3,500 psi (241 bar)	< 1.6 ft/s (0.5 m/s)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

UP – Industrial U-cup Piston Seal

The UP profile is a non-symmetrical, hydraulic piston seal. The knife trimmed, beveled lip faces the bore to provide enhanced low to high-pressure sealing and wiping action. The UP profile is a uni-directional seal. Two UP seals can be used, back to back, in separate grooves to provide bi-directional pressure sealing. The UP profile is an economical choice, available in Parker’s wear resistant and extrusion resistant Molythane® compound.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
P4615A90	-65°F to +200°F (-54°C to +93°C)	5,000 psi (344 bar)	< 1.6 ft/s (0.5 m/s)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

E4 – Rounded Lip Pneumatic U-cup Piston Seal

Parker’s E4 profile is a non-symmetrical piston seal designed to seal both lubricated and non-lubricated air. To ensure that critical surfaces retain lubrication, the radius edge of the lip is designed to hydroplane over pre-lubricated surfaces. The standard compound for the E4 profile is Parker proprietary Nitroxile® Extreme Low Friction (“ELF”) compound N4274A85. This compound is formulated with proprietary internal lubricants to provide extreme low friction and excellent wear resistance. This compound provides extended cycle life over standard nitrile and carboxylated nitrile compounds.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
N4274A85	-10°F to +250°F (-23°C to +121°C)	250 psi (17 bar)	< 3 ft/s (1 m/s)
N4180A80	-40°F to +250°F (-40°C to +121°C)	250 psi (17 bar)	< 3 ft/s (1 m/s)
V4208A90	-5°F to +400°F (-21°C to +204°C)	250 psi (17 bar)	< 3 ft/s (1 m/s)
P5065A88	-70°F to +200°F (-57°C to +93°C)	250 psi (17 bar)	< 3 ft/s (1 m/s)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

BMP – Rounded Lip Seal with Bumper Cushion

The Parker BMP profile is a low friction bumper and seal providing quiet deceleration and reduced end stroke noise in pneumatic piston applications. Designed to mount on the ends of the piston and to be used along with Parker’s V6 profile cushion seal, the bumper pad absorbs the final inertia which prevents contact between the piston and tube ends. The BMP profile can also be used without cushion seals in less critical applications. The BMP profile has a rounded sealing edge which hydroplanes over pre-lubricated surfaces extending cycle life and reducing friction. The BMP profile is available in Parker’s proprietary Nitroxile® compound, offering low friction and wear resistance, as well as fluorocarbon for extended temperature range.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
N4283A75	-10°F to +250°F (-23°C to +121°C)	250 psi (17 bar)	< 3 ft/s (1 m/s)
N4274A85	-10°F to +250°F (-23°C to +121°C)	250 psi (17 bar)	< 3 ft/s (1 m/s)
V4208A90	-5°F to +400°F (-21°C to +204°C) (	250 psi (17 bar)	< 3 ft/s (1 m/s)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

TP (Piston T-seal) – PTFE Rod Cap Seal to Retrofit O-ring Glands

Parker’s TP profile piston T-seal is designed to retrofit o-rings in no back-up, single backup and two backup standard industrial reciprocating o-ring glands. Its compact design provides improved stability and extrusion resistance in dynamic fluid sealing applications. The flange or base of the T-seal forms a tight seal in the gland and supports the anti-extrusion back-up rings. When energized, the backup rings bridge the extrusion gap to protect the rubber sealing element from extrusion and system contamination. The T-seal geometry eliminates the spiral or twisting failure that can occur when o-rings are used against a dynamic surface. Parker offers the TP profile in a variety of elastomer and backup ring compounds to cover a wide range of fluid compatibility, pressure and temperature.

Profile TP0 for no back-up o-ring gland (standard offering)
Profile TPS for single backup o-ring gland
Profile TPT for two backup o-ring gland

Technical Data

Base Elastomer	Temperature Range	Surface Speed
N4115A75	-40°F to +225°F (-40°C to +107°C)	< 1.6 ft/s (0.5 m/s)
N4274A85	-10°F to +250°F (-23°C to +121°C)	< 1.6 ft/s (0.5 m/s)
V4205A75	-20°F to +400°F (-29°C to +204°C)	< 1.6 ft/s (0.5 m/s)
E4259A80	-65°F to +300°F (-54°C to +149°C)	< 1.6 ft/s (0.5 m/s)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

S5 – Square PTFE Cap Seal

The Parker S5 profile is a bi-directional piston seal for use in low to medium duty hydraulic actuators and is suitable for sealing against hardened surfaces in pneumatic applications. The S5 profile is a two piece design comprised of a standard size Parker o-ring energizing a glass-filled PTFE cap. The S5 profile offers long wear, low friction and because of its short assembly length requires minimal gland space on the piston. The seal is commonly used in applications such as agriculture hydraulics, mobile hydraulics, machine tools, and hydraulic presses. Parker’s S5 profile will retrofit non-Parker seals of similar design and is an updated version of the Parker S5000 piston seal.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
Cap
0203 - 15% Fiberglass filled PTFE	-200°F to +575°F (-129°C to +302°C)	3500 psi (241 bar)	< 13 ft/s (4 m/s)
Energizer
A - 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

R5 – Rectangular PTFE Cap Seal

The Parker R5 profile is a bi-directional piston seal for use in medium to heavy duty hydraulic actuators and is suitable for sealing against hardened surfaces in pneumatic applications. The R5 profile is a two piece design comprised of a standard size rubber square ring energizing a rectangular shaped PTFE cap. The R5 profile offers excellent stability, long wear, low friction and extrusion protection. The seal is commonly used in applications such as agriculture hydraulics, mobile hydraulics, machine tools and hydraulic presses. Parker’s R5 profile will retrofit non-Parker seals of similar design and is an updated version of the Parker R5100 piston seal.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
Cap
0203 - 15% Fiberglass filled PTFE	-200°F to +575°F (-129°C to +302°C)	3500 psi (241 bar)	< 13 ft/s (4 m/s)
Energizer
A - 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

CQ – Premium PTFE Cap Seal with Anti-Drift Technology

The Parker CQ profile is a bi-directional piston seal for use in medium to heavy-duty hydraulic applications. The CQ profile is a unique seal design that includes a rubber quad seal in the PTFE cap to ensure drift-free performance. The PTFE cap is a stable rectangular shape and is energized, depending on its cross section, by a single square energizer or dual Parker o-rings. The CQ piston seal is commonly used in applications such as mobile hydraulics, lift trucks, standard cylinders and piston accumulators. Parker’s CQ profile will retrofit non-Parker seals of similar design.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
Cap
0401 - 40% bronze filled PTFE	-200°F to +575°F (-129°C to +302°C)	5000 psi (344 bar)	< 9.8 ft/s (3 m/s)
Energizer/Quad Seal
A - 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

OE – PTFE Piston Cap Seal

The Parker OE profile is a bi-directional piston seal for use in low to medium duty hydraulic applications. The OE profile is a two piece design comprised of a standard size Parker o-ring energizing a wear resistant PTFE cap. The OE profile offers long wear, low friction and because of its short assembly length requires minimal gland space on the piston. The seal is commonly used in applications such as mobile hydraulics, machine tools, injection molding machines and hydraulic presses. Parker’s OE profile will retrofit non-Parker seals of similar design.

Technical Data

Standard Materials*	Temperature Range	Pressure Range†	Surface Speed
Cap
0401- 40% bronze filled PTFE	-200°F to +575°F (-129°C to +302°C)	5000 psi (344 bar)	< 13 ft/s (4 m/s)
Energizer
A - 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

OG – PTFE Piston Cap Seal

The Parker OG profile is a single-acting piston sealing set profile consisting of a PTFE piston sealing ring and an elastomer o-ring energizer. The asymmetrical cross-section of the slipper ring is designed for best drag oil performance during stroke in both directions. The OG profile is particularly suitable for single-acting pistons in control cylinders, in servo-controlled systems, machine tools, quick acting cylinders. The material combination of the PTFE slipper ring and the elastomer o-ring make this product suitable for a wide range of applications, especially for aggressive media and/or high temperatures.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
Cap
0401 - 40% Bronze-filled PTFE	-200°F to +575°F (-129°C to +302°C)	5000 psi (344 bar)	< 13 ft/s (4 m/s)
Energizer
A - 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

CP – PTFE Piston Cap Seal

The Parker CP profile is a cap seal with anti-extrusion, low friction and low wear features. The CP profile is a bi-directional piston seal for use in low to medium duty applications. Because of the unique design of the filled PTFE cap, the CP profile offers long wear, low friction and anti-extrusion. Only minimal gland space is needed to fit the seal on the piston due to its short assembly length. The CP profile retrofits into a standard size o-ring groove without modification and will retrofit non-Parker seals of similar design. There are three CP profiles to match groove widths:

CP0 — a standard o-ring groove
CP1 — an o-ring groove designed for one backup ring
CP2 — an o-ring groove designed for two backup rings

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
Cap
0401 40% Bronze-filled PTFE	-200°F to +575°F (-129°C to +302°C)	3,500 psi (240 bar)	< 13 ft/s (4 m/s)
Energizer
A - 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

OA – Compact PTFE Piston Cap Seal

The Parker OA profile is a bi-directional piston seal for use in pneumatic and low- to medium-duty hydraulic applications. The OA profile is a two-piece design utilizing a rectangular PTFE cap and standard size o-ring. The OA profile is an excellent choice for applications requiring a compact design. The unique properties of the modified PTFE provide added wear resistance for improved cycle life. Parker’s OA profile will retrofit non-Parker seals of similar design.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
Cap
0102 - Modified PTFE	-320°F to +450°F (-195°C to +282°C)	1,500 psi (103 bar)	< 13 ft/s (4 m/s)
Energizer
A - 70A Nitrile	-30°F to +250°F (-34°C to +121°C)

Alternate Materials: For applications that may require an alternate material, please consult ESP.

† Pressure Range: without wear rings.

OQ – Rotary PTFE Cap Seal

The Parker OQ profile is a bi-directional piston seal for use in low to medium duty rotary or oscillating applications. The OQ profile is a two piece design comprised of a standard size o-ring energizing a wear resistant PTFE cap. The OQ profile offers long wear and low friction, without stickslip. The PTFE inner diameter is designed with a special interference with the o-ring to eliminate spinning between the o-ring and seal. Special grooves are designed into the PTFE outer diameter to provide lubrication and create a labyrinth effect for reduced leakage. Parker’s OQ profile will retrofit non-Parker seals of similar design.

Technical Data

Standard Materials	Temperature Range	Pressure Range†	Surface Speed
Cap
0205 - 15% Fiberglass-, 5% MoS2-filled PTFE	-200°F to +575°F (-129°C to +302°C)	3000 psi (206 bar)	< 3.3 ft/s (1.0 m/s)
Energizer
A - 70A Nitrile	-30°F to +250°F (-34°C to +121°C)