The O-Ring Store LLC, We make getting O-Rings easy!


O-Rings are a critical component of nearly every type of application. These donut-shaped engineered high performance seals, seal connections in equipment by forcing a rubber seal into a channel and applying mechanical or hydraulic pressure to prevent clearance of a less viscous material. These inexpensive, easy to replace and maintain components don’t always get the credit they deserve. But, when they are not properly selected or cared for, O-Rings can create leaks, stop production, damage equipment or worse.... O-Rings are among the sealing industry’s most important sealing component.

Endless O-Rings with a circular cross-section, ‘O’ ring, or toroidal seal, is an exceptionally versatile sealing device. Primarily used for static sealing of inactive machinery components against liquids and gases. Applications, ranging from garden hose couplings to aerospace or oil and gas duties, make it the world’s most popular volume-produced seal. O-rings offer many benefits to designers, engineers, maintenance staff and plant operators.

  • Suit many static and dynamic applications.
  • Are very compact and occupy little space.
  • Seal efficiently in both directions.
  • Can work between -76° to +428°F (-60° to +228°C) depending on material type.
  • Can function at temperatures down to -200°C when made of PTFE.

Designed to deform, the O-ring "flows" to fill the diametrical clearance and blocks any further leakage. Pressure, as well as many other considerations, determine the effectiveness of a seal. These considerations are highlighted throughout this design guide. O-Rings are inserted into cavities defined as glands, and are typically used in one of two seal designs, axial or radial.

An O-Ring is specified by its inner diameter, its cross-section diameter, its material hardness/durometer (typically defined by the Shore A hardness), and its material composition. We can help you select the correct O-Ring via online chat or email.