For a better seal in low-pressure applications, such as hydraulic return lines and oil drain plugs, these O-rings are softer than standard Buna-N O-rings.

Choose these O-rings for their adherence to strict military standards for material and construction.

If these O-rings deteriorate, they’ll be picked up by metal- and X-ray-detection systems.

A step up from Buna-N, these HNBR O-rings contain extra hydrogen to better resist chemicals, weather, and abrasion.

Softer than standard Viton® fluoroelastomer O-rings, these offer a better seal in low-pressure applications.

Tested to meet ASTM E595, a standard used by NASA, these O-rings give off almost no volatile emissions that could damage sensitive electronics, even in a vacuum. They’re softer than standard Viton®, so they better conform to irregular surfaces.

With flat edges on all four sides, these square-profile O-rings cover more surface than round-profile O-rings for a better seal in static applications, such as hose, pipe, and faucet connections.

Because one black O-ring looks just like another, these O-rings are brown for easy identification.

Made and bagged in an ISO Class 7 clean room, these O-rings won’t shed particles.

Inherently softer and more compressible than PTFE O-rings, these Kalrez 4079 O-rings have comparable chemical resistance.

Create seals for use in semiconductor manufacturing, food processing, and other highly controlled applications. More pure than Kalrez 4079 O-rings, these Kalrez 6230 O-rings won’t leach contaminants into your line.

If these O-rings deteriorate, they can be picked up by metal detection systems.

Able to withstand temperatures up to 400° F, these O-rings are softer than standard silicone O-rings for a better seal in low-pressure applications.

Made and bagged in an ISO Class 7 (Fed. Std. Class 10,000) clean room, these are the highest purity high-temperature O-rings we offer.