Precision Associates’ Homogeneous Rubber U-Cups are the seal of choice for Pneumatic and low-pressure Hydraulic applications. Because U-Cups do not rely on initial compression to seal, they are excellent in applications that require low breakaway pressure. The sealing lips on Precision Associates’ U-Cups are molded – not cut, so they are always symmetrical. The sealing lip has a very slight radius, reducing the likely hood of wiping all of the lubricant, which might cause a dry surface that leads to wear and early seal failure.

Our U-Cups are available in three standard configurations; AN, Straight Lip and Pruva™ styles. AN style U-Cups are designed in accordance with AN-6226. The original 53 sizes are listed with the dash numbers assigned by the standard. This lighter bodied seal has been so popular with some customers we have expanded our selection of AN sizes. Parts included in this extension to the standard are numbered similar to our other two styles.

Precision Associates’ U-Cups are available off the shelf in our 70 and 80 Durometer Buna N and Fluoroelastomer compounds. For unusual applications, one of PAI’s 1,000+ specialty materials, including our N-Dure extended wear compounds, may be your solution. If not, we can design a compound especially for you.