For Rod Diameter For Rod Diameter |
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Seal OD Seal OD |
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Seal ID Seal ID |
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For Bore Diameter For Bore Diameter |
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For Cylinder Type For Cylinder Type |
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For Groove Diameter For Groove Diameter |
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Cylinder Seal Type Cylinder Seal Type |
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| Piston Seal |
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| Rod Seal |
For Use With For Use With |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Close
About Cylinder Seals
Rod wipers scrape dirt, dust, and moisture from the rod, preventing contamination inside your cylinder.
Rod seals maintain the pressure inside cylinders and prevent fluid from leaking out.
Wear rings guide the rod and piston to prevent uneven wear and optimize seal performance.
Head seals are a more reliable alternative to the standard O-ring/backup ring combination—they resist twisting and remain stable even in applications with fluctuating pressure.
Buffering seals protect hydraulic cylinders from pressure spikes and shock in high-pressure hydraulic applications.
Cushioning seals minimize wear and noise in air-powered cylinders by preventing the piston from slamming against the cylinder body.
Piston seals make a seal between their outside edge and the cylinder bore to prevent internal leaks.
High-Stability O-Ring-Loaded U-Cup Seals
Side 1
Side 2
Profile
Piston Installation
Rod Installation
Also known as Type B seals, loaded-lip seals, and PolyPaks, these U-cups are wider than our other O-ring-loaded U-cup seals for better stability. An O-ring secures them to the rod or piston, preventing leaks at low pressure and as the seal wears. Because U-cups have a sealing lip on both the inside and outside edges, they can be used for rod and piston sealing. Pistons require two seals—install one facing in each direction.
Note: Maximum performance values cannot be achieved simultaneously; for example, speed is affected by pressure, temperature, and other operating conditions.
For technical drawings and 3-D models, click on a part number.
For Rod Sealing | For Piston Sealing | O-Ring | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Rod Dia. | For Groove Dia. | For Bore Dia. | For Groove Dia. | Max. Speed, ft./sec. | Max. Pressure, psi | Temp. Range, °F | Hardness | Color | Hardness | Color | Each | |
Polyurethane Rubber with Buna-N Rubber O-Ring | ||||||||||||
For 0.206" Groove Wd. | ||||||||||||
| 5/8" | 0.875" | 7/8" | 0.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 3/4" | 1.000" | 1" | 0.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1" | 1.250" | 1 1/4" | 1.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/8" | 1.500" | 1 1/2" | 1.125" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/4" | 1.500" | 1 1/2" | 1.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
For 0.253" Groove Wd. | ||||||||||||
| 1 3/4" | 2.125" | 2 1/8" | 1.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
For 0.275" Groove Wd. | ||||||||||||
| 1/4" | 0.500" | 1/2" | 0.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 3/8" | 0.625" | 5/8" | 0.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1/2" | 0.750" | 3/4" | 0.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 5/8" | 0.875" | 7/8" | 0.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 3/4" | 1.000" | 1" | 0.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 7/8" | 1.125" | 1 1/8" | 0.875" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1" | 1.250" | 1 1/4" | 1.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/16" | 1.313" | 1 5/16" | 1.062" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/8" | 1.375" | 1 3/8" | 1.125" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/4" | 1.500" | 1 1/2" | 1.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/4" | 1.625" | 1 5/8" | 1.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 3/8" | 1.625" | 1 5/8" | 1.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/2" | 1.750" | 1 3/4" | 1.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 2" | 2.250" | 2 1/4" | 2.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 2 1/8" | 2.375" | 2 3/8" | 2.125" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
For 0.343" Groove Wd. | ||||||||||||
| 7/8" | 1.250" | 1 1/4" | 0.875" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1" | 1.375" | 1 3/8" | 1.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 3/8" | 1.750" | 1 3/4" | 1.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/2" | 1.875" | 1 7/8" | 1.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 5/8" | 2.000" | 2" | 1.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 3/4" | 2.125" | 2 1/8" | 1.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 2" | 2.375" | 2 3/8" | 2.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
For 0.413" Groove Wd. | ||||||||||||
| 1" | 1.500" | 1 1/2" | 1.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/4" | 1.750" | 1 3/4" | 1.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 3/8" | 1.750" | 1 3/4" | 1.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/2" | 1.875" | 1 7/8" | 1.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 1/2" | 2.000" | 2" | 1.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 5/8" | 2.000" | 2" | 1.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 3/4" | 2.250" | 2 1/4" | 1.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 2" | 2.500" | 2 1/2" | 2.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 2 3/8" | 2.875" | 2 7/8" | 2.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 2 1/2" | 2.875" | 2 7/8" | 2.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 2 1/2" | 3.000" | 3" | 2.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 3 1/2" | 4.000" | 4" | 3.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 3 5/8" | 4.125" | 4 1/8" | 3.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 4" | 4.500" | 4 1/2" | 4.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
For 0.55" Groove Wd. | ||||||||||||
| 2 1/4" | 3.000" | 3" | 2.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 3 3/8" | 4.000" | 4" | 3.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
For 0.825" Groove Wd. | ||||||||||||
| 3 1/2" | 4.500" | 4 1/2" | 3.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |