Precision Associates, Inc.

Explore our AS-568 & Extended Standard Size O-Rings including our new 532" Nominal Cross Section O-Rings. Precision Associates' O-Rings are available off the shelf in several standard compounds. Or try O-Rings in one of 1, 200+ specialty materials in 20 polymer groups, including Viton®, AFLAS®, EPDM, Nitrile, HNBR (HSN), XNBR, Neoprene®, Butyl, XNBR, Silicone, Fluorosilicone, Perfluoroelastomer, Urethane, Hypalon®, and Hydrin®. Click here to view our 48 page (5Mb) Catalog

Precision Associates AN Rod Wipers are made to the exact dimmensions specified on Military drawing MS 28776.

PAI Kurv-Bak™ hard rubber back-up rings can be made in a variety of materials to help prevent early seal failure at higher pressures.

Twice the Sealing Surface — Multi-lobed design provides more sealing surfaces than standard O-Rings. • Prolonged Seal Life – With multiple seal points, less squeeze is required to provide an effective seal. Less friction and wear will increase seal life and lower maintenance costs. • Prevents Spiral Failure – The “X” profile creates a stable seal that is more resistant to rolling in a groove than an O-Ring when used in a dynamic

A better seal – The multi-lobed design provides more sealing surfaces than standard O-Rings. Increases life for the seal ring – With multiple seal points, less squeeze is required to provide an effective seal. This means less friction and wear which will increase seal life and lower maintenance costs. Prevents spiral failure – The square cross sections resist distortion called “spiral twist” that may be encountered when using O-Rings.

Another method of testing used to predict seal life, Compressive Stress Relaxation measures the force a rubber seal exerts against it’s mating surface after being exposed to aging conditions over a specific period of time. The ability of the material to maintain this force is useful in predicting seal longevity in an application when considered in relation to the Compression Set data.