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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.
O-Ring-Loaded U-Cup Seals
Side 1
Side 2
Profile
Piston Installation
Rod Installation
Also known as loaded-lip seals and PolyPaks, an O-ring secures these U-cups to the rod or piston for better sealing performance at lower pressures than unsupported U-cup seals. 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 0.138" Groove Wd. | ||||||||||||
| 1/8" | 0.375" | 3/8" | 0.125" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 00000 |
| 3/16" | 0.438" | 7/16" | 0.187" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1/4" | 0.500" | 1/2" | 0.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 5/16" | 0.563" | 9/16" | 0.312" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 3/8" | 0.625" | 5/8" | 0.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 7/16" | 0.688" | 11/16" | 0.437" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1/2" | 0.750" | 3/4" | 0.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 5/8" | 0.875" | 7/8" | 0.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 3/4" | 1.000" | 1" | 0.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 7/8" | 1.125" | 1 1/16" | 0.875" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1" | 1.250" | 1 1/4" | 1.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 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 | 0000000 | 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 | 0000000 | 0000 |
For 0.172" Groove Wd. | ||||||||||||
| 3/4" | 1.063" | 1 1/16" | 0.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1" | 1.313" | 1 5/16" | 1.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1 3/16" | 1.500" | 1 1/2" | 1.187" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1 3/8" | 1.688" | 1 11/16" | 1.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
For 0.206" Groove Wd. | ||||||||||||
| 3/16" | 0.563" | 9/16" | 0.187" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 3/8" | 0.750" | 3/4" | 0.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 7/16" | 0.813" | 13/16" | 0.437" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1/2" | 0.875" | 7/8" | 0.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 5/8" | 1.000" | 1" | 0.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 3/4" | 1.125" | 1 1/8" | 0.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 7/8" | 1.250" | 1 1/4" | 0.875" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1" | 1.375" | 1 3/8" | 1.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 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 | 0000000 | 0000 |
| 1 3/16" | 1.563" | 1 9/16" | 1.187" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 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 | 0000000 | 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 | 0000000 | 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 | 0000000 | 0000 |
| 1 5/8" | 2.000" | 2" | 1.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1 7/8" | 2.250" | 2 1/4" | 1.875" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 2" | 2.375" | 2 3/8" | 2.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 2 1/8" | 2.500" | 2 1/2" | 2.125" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 2 3/8" | 2.750" | 2 3/4" | 2.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 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 | 0000000 | 0000 |
| 2 5/8" | 3.000" | 3" | 2.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 2 3/4" | 3.125" | 3 1/8" | 2.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
For 0.275" Groove Wd. | ||||||||||||
| 1/2" | 1.000" | 1" | 0.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 5/8" | 1.125" | 1 1/8" | 0.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 3/4" | 1.250" | 1 1/4" | 0.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 7/8" | 1.375" | 1 3/8" | 0.875" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1" | 1.500" | 1 1/2" | 1.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1 1/8" | 1.625" | 1 5/8" | 1.125" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1 3/16" | 1.688" | 1 11/16" | 1.187" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 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 | 0000000 | 0000 |
| 1 3/8" | 1.875" | 1 7/8" | 1.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 1 1/2" | 2.000" | 2" | 1.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 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 | 0000000 | 0000 |
| 2" | 2.500" | 2 1/2" | 2.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 0000 |
| 2 1/4" | 2.750" | 2 3/4" | 2.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 0000000 | 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 | 00000 |
| 2 3/4" | 3.250" | 3 1/4" | 2.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 3" | 3.500" | 3 1/2" | 3.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 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 3/4" | 4.250" | 4 1/4" | 3.750" | 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 |
| 4 1/2" | 5.000" | 5" | 4.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 4 3/4" | 5.250" | 5 1/4" | 4.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 6 1/2" | 7.000" | 7" | 5.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
For 0.343" Groove Wd. | ||||||||||||
| 1 3/8" | 2.000" | 2" | 1.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 0000 |
| 1 7/8" | 2.500" | 2 1/2" | 1.875" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 2" | 2.625" | 2 5/8" | 2.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 2 3/8" | 3.000" | 3" | 2.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 5 3/8" | 6.000" | 6" | 5.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 7 3/8" | 8.000" | 8" | 7.375" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
For 0.413" Groove Wd. | ||||||||||||
| 1 1/4" | 2.000" | 2" | 1.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 1 1/2" | 2.250" | 2 1/4" | 1.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 1 5/8" | 2.375" | 2 3/8" | 1.625" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 1 3/4" | 2.500" | 2 1/2" | 1.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 2" | 2.750" | 2 3/4" | 2.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 2 1/8" | 2.875" | 2 7/8" | 2.125" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 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 |
| 2 1/2" | 3.250" | 3 1/4" | 2.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 2 3/4" | 3.500" | 3 1/2" | 2.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 3" | 3.750" | 3 3/4" | 3.000" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 3 1/4" | 4.000" | 4" | 3.250" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 3 1/2" | 4.250" | 4 1/4" | 3.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 3 3/4" | 4.500" | 4 1/2" | 3.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 4 3/4" | 5.500" | 5 1/2" | 4.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
High-Stability O-Ring-Loaded U-Cup Seals
Side 1
Profile
Side 2
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 1/4" | 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 | 00000 |
| 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 | 00000 |
| 2 1/2" | 3.000" | 3" | 2.500" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 2 3/4" | 3.250" | 3 1/4" | 2.750" | 1.6 | 5,000 | -65° to 300° | Durometer 90A (Hard) | Black | Durometer 70A (Medium) | Black | 00000000 | 00000 |
| 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 |
For 0.55" Groove Wd. | ||||||||||||
| 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 |
Buna-N U-Cup Seals
Side 1
Profile
Side 2
These U-cup seals create less friction than O-ring-loaded U-cups, so they wear more slowly. Also known as lip seals, U-cups have a sealing lip on both the inside and outside edges, so they can be used for rod and piston sealing. Pistons require two seals—install one facing in each direction.
U-cups that meet military specification AN6226 fit dimensions specified by the standard.
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.
Buna-N Rubber Seals
Piston Installation
Rod Installation
For Rod Sealing | For Piston Sealing | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Rod Dia. | For Groove Dia. | For Bore Dia. | For Groove Dia. | Max. Speed, ft./sec. | Max. Pressure, psi | Temp. Range, °F | Hardness | Color | Each | |
For 0.093" Groove Wd. | ||||||||||
| 1/4" | 0.375" | 3/8" | 0.250" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
| 5/8" | 0.812" | 13/16" | 0.625" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
For 1/8" Groove Wd. | ||||||||||
| 1/4" | 0.437" | 7/16" | 0.250" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1/2" | 0.750" | 3/4" | 0.500" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 5/8" | 0.812" | 13/16" | 0.625" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 3/4" | 1.000" | 1" | 0.750" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 7/8" | 1.125" | 1 1/8" | 0.875" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 1" | 1.250" | 1 1/4" | 1.000" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 1 1/4" | 1.500" | 1 1/2" | 1.250" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
For 0.156" Groove Wd. | ||||||||||
| 1/4" | 0.562" | 9/16" | 0.250" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 3/8" | 0.625" | 5/8" | 0.375" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1/2" | 0.750" | 3/4" | 0.500" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 5/8" | 0.875" | 7/8" | 0.625" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 3/4" | 1.000" | 1" | 0.750" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 7/8" | 1.125" | 1 1/8" | 0.875" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1" | 1.250" | 1 1/4" | 1.000" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 1/8" | 1.375" | 1 3/8" | 1.125" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 1/4" | 1.500" | 1 1/2" | 1.250" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 3/8" | 1.687" | 1 11/16" | 1.375" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 1 1/2" | 1.812" | 1 13/16" | 1.500" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 1 3/4" | 2.000" | 2" | 1.750" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
For 0.188" Groove Wd. | ||||||||||
| 7/8" | 1.250" | 1 1/4" | 0.875" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1" | 1.312" | 1 5/16" | 1.000" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 1/8" | 1.437" | 1 7/16" | 1.125" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 1/4" | 1.562" | 1 9/16" | 1.250" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 3/8" | 1.687" | 1 11/16" | 1.375" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 1/2" | 1.812" | 1 13/16" | 1.500" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 3/4" | 2.125" | 2 1/8" | 1.750" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 2" | 2.375" | 2 3/8" | 2.000" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
For 0.218" Groove Wd. | ||||||||||
| 3/4" | 1.125" | 1 1/8" | 0.750" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 3/8" | 1.750" | 1 3/4" | 1.375" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 1/2" | 1.875" | 1 7/8" | 1.500" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 5/8" | 2.000" | 2" | 1.625" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 3/4" | 2.125" | 2 1/8" | 1.750" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 1 7/8" | 2.250" | 2 1/4" | 1.875" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 2" | 2.375" | 2 3/8" | 2.000" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
| 2 1/4" | 2.625" | 2 5/8" | 2.250" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
| 2 1/2" | 2.875" | 2 7/8" | 2.500" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
| 2 3/4" | 3.125" | 3 1/8" | 2.750" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
| 3" | 3.375" | 3 3/8" | 3.000" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
For 1/4" Groove Wd. | ||||||||||
| 1 3/8" | 1.875" | 1 7/8" | 1.375" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 1 1/2" | 2.000" | 2" | 1.500" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 1 3/4" | 2.250" | 2 1/4" | 1.750" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 2" | 2.500" | 2 1/2" | 2.000" | 1 | 120 | -20° to 212° | Durometer 70A (Hard) | Black | 0000000 | 0000 |
| 2 1/2" | 2.937" | 2 15/16" | 2.500" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
| 2 3/4" | 3.187" | 3 3/16" | 2.750" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
| 3" | 3.437" | 3 7/16" | 3.000" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
For 0.281" Groove Wd. | ||||||||||
| 2 1/2" | 3.000" | 3" | 2.500" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 0000 |
For 0.406" Groove Wd. | ||||||||||
| 2 1/4" | 3.000" | 3" | 2.250" | 1.6 | 250 | -40° to 250° | Durometer 80A (Hard) | Black | 00000000 | 00000 |
AN6226 Buna-N Rubber Seals
Piston Installation
Rod Installation
For Rod Sealing | For Piston Sealing | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Rod Dia. | For Groove Dia. | For Bore Dia. | For Groove Dia. | Max. Pressure, psi | Temp. Range, °F | Hardness | Color | Specifications Met | Pkg. Qty. | Pkg. | |
For 0.282" Groove Wd. | |||||||||||
| 1/4" | 0.750" | 3/4" | 0.250" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 00000 |
| 3/8" | 0.875" | 7/8" | 0.375" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1/2" | 1.000" | 1" | 0.500" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 5/8" | 1.125" | 1 1/8" | 0.625" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 3/4" | 1.250" | 1 1/4" | 0.750" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 7/8" | 1.375" | 1 3/8" | 0.875" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1" | 1.500" | 1 1/2" | 1.000" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1 1/8" | 1.625" | 1 5/8" | 1.125" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1 1/4" | 1.750" | 1 3/4" | 1.250" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
For 0.344" Groove Wd. | |||||||||||
| 1 1/4" | 1.875" | 1 7/8" | 1.250" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1 3/8" | 2.000" | 2" | 1.375" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1 1/2" | 2.125" | 2 1/8" | 1.500" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1 5/8" | 2.250" | 2 1/4" | 1.625" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1 3/4" | 2.375" | 2 3/8" | 1.750" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 1 7/8" | 2.500" | 2 1/2" | 1.875" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 0000 |
| 2" | 2.625" | 2 5/8" | 2.000" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 00000 |
| 2 1/4" | 2.875" | 2 7/8" | 2.250" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 00000 |
| 2 3/8" | 3.000" | 3" | 2.375" | 120 | -20° to 212° | Durometer 70A (Hard) | Black | AN6226 | 5 | 0000000 | 00000 |
High-Pressure Leather U-Cup Seals
Side 1
Side 2
Profile
Piston Installation
Rod Installation
Rated for pressure up to 10,000 psi, these leather U-cups handle over 80 times more pressure than our Buna-N U-cups. Leather is tough, pliable, and wear resistant, so it flexes to fit uneven surfaces and fill voids. U-cups 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 | |||||||
|---|---|---|---|---|---|---|---|---|
| For Rod Dia. | For Groove Dia. | For Bore Dia. | For Groove Dia. | Max. Pressure, psi | Temp. Range, °F | Color | Each | |
Wax-Filled Leather | ||||||||
For 1/4" Groove Wd. | ||||||||
| 1/4" | 0.750" | 3/4" | 0.250" | 10,000 | 0° to 180° | Black | 0000000 | 000000 |
| 3/8" | 0.875" | 7/8" | 0.375" | 10,000 | 0° to 180° | Black | 0000000 | 00000 |
| 1/2" | 1.000" | 1" | 0.500" | 10,000 | 0° to 180° | Black | 0000000 | 00000 |
| 5/8" | 1.125" | 1 1/8" | 0.625" | 10,000 | 0° to 180° | Black | 0000000 | 00000 |
| 3/4" | 1.250" | 1 1/4" | 0.750" | 10,000 | 0° to 180° | Black | 0000000 | 00000 |
| 7/8" | 1.375" | 1 3/8" | 0.875" | 10,000 | 0° to 180° | Black | 0000000 | 00000 |
| 1" | 1.500" | 1 1/2" | 1.000" | 10,000 | 0° to 180° | Black | 0000000 | 00000 |
| 1 1/8" | 1.625" | 1 5/8" | 1.125" | 10,000 | 0° to 180° | Black | 0000000 | 00000 |
| 1 1/4" | 1.750" | 1 3/4" | 1.250" | 10,000 | 0° to 180° | Black | 0000000 | 00000 |