Large O-rings are the most massive sized O-rings available for sale. Some are offered through sizing charts and mass produced, while others must be custom made to fit certain dimensions. They are made out of elastomeric rubber or thermoplastic materials like silicone, Teflon or Viton, and exhibit the same properties.
Large O-rings are used in most process industries, specifically within the chemical, hydrocarbon, pharmaceutical, food processing, beverage and electronics industries. The multitude of applications for large o-rings includes thread tube fitting, which involves a third piece between two tubes that connects them, known as a union piece. This piece allows access for system check-ups and management of leaks and such. Fitting military gland designs, which are larger than most O-ring grooves, is also one example of how large o-rings are utilized. There is also the production of flat panel displays, which are built to support the weight of an object perpendicular to a wall. Such a display cannot shake or move and therefore requires the soft buffer of an o-ring between the wall and the mount part screwed into it. All of these applications require the use of a basic o-ring, except with a larger width, outside diameter and inside diameter, to support the proper magnitude of the product it is part of supporting. Large o-rings are usually rubber rather than metal, particularly in reference to the three applications just discussed.
Large O-Rings - Allied Metrics Seals & Fasteners, Inc.