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.

The O-ring Store offers an assortment includes rod, piston and wiper seals as well as guides, O-rings and back-up rings. Fluid power seals sizes readily available in a multitude of materials to provide optimal compatibility with the various hydraulic fluids encountered in service.

There are a wide variety of U-Cup style seals for both rod and piston applications that come in an equally wide variety of materials. Below you will find the general guidelines you need to consider when choosing the style and material of the seal most appropriate for your application.

Energized U-cup rod seals incorporate a nitrile rubber (NBR) X-ring in their thermoplastic polyurethane (TPU) U-cup. The X-ring serves as energizer, provides additional sealing force and improves the long-term resilience of the sealing lips.

U-Cup Seals or U-Ring Seals are commonly used in linear applications to seal the rod or piston. Many different ucup configurations exist to properly seal that demanding application. MFP offers a wide range of metric U-Cup designs and produces them from a broad range of materials.

Zurcon® U-Cup RU9 Rod seals are particularly exposed to pressure and friction and a long service life is a specific requirement of piston rods. Zurcon®U-Cup RU9 can offer this with its outstanding wear and extrusion resistance.

The loaded U-cup is an excellent seal in low pressure rod and piston applications. As the system pressure increases, the loading lip force also increases, automatically compensating for the higher pressure while maintaining a positive seal.

U-cups, also known as symmetrical seals, U-rings, or U-seals because of their “U” shaped profile, are multipurpose sealing solutions suitable for hydraulic and pneumatic rods and pistons.

Select from a wide range of Asymmetrical U-Cup Rod seals. Standard Non Symmetrical U-Cup designs for linear rod applications available at MFP SEALS.

U-cup is a specialized rod seal design, developed from the standard Symmetrical U-cup. It assures improved sealing performance due to the following features: Interference Fit in the Groove. The RO. U-cup has an OD. Larger than the groove for which it is intended.