Description and Applications of Metallic "O" Ring Seals
The AmeriSeal O-Ring Seals are used when elastomers and other non-metallic seals will not seal properly or do not offer the required reliability for the application, usually as a result of temperatures, pressures, or the environment. AmeriSeal O-Ring Seals are long lasting seals and unlike non-metallic seals, they are not subject to failure due to incompatibility with the environment, out gassing or from deterioration due to age.
AmeriSeal O-Ring Seals are generally fabricated from tubing consisting of stainless steel or high temperature alloys such as Inconel. These materials are frequently used because they offer resilient properties that enable the seal to "Spring-Back."
AmeriSeal O-Rings are used as static face type seals and should not be used as a dynamic seal. While the majority of seals are circular, many seals are produced in rectangular, racetrack, and other various shapes and configurations.
We welcome the opportunity to design a seal to fit your application. Whether you are sealing gases or liquid -423°F or 2000°F, vacuum to 50,000 PSI. We have the capability to produce a suitable seal from available material.
The following are key elements in specifying the proper seal determining the base material:
- Temperature limits/duration
- Media to be sealed
- System pressure
- Available seating load
Plating and Coatings
Plating or Coating of the O-Ring Seal provides a soft malleable surface that will smear into small imperfections in the mating hardware, enhancing seal performance.
Metallic O-Ring Seals can be produced in various shapes. The availability of shaped O-Ring permits the design engineer to select the shapes. However, we recommend contacting our Technical Service staff for design assistance of seal and groove.
Suggested Minimum Radii for Shaped Seals
Free Height - Minimum Radius
0.035" - 0.125"
0.062" - 0.250"
0.094" - 0.500"
0.125" - 0.750"
0.156" - 1.50"
0.188" - 2.00"
0.250" - 4.00"
0.375" - 6.00"
0.500" - 10.00"
The typical application places a Metallic O-Ring Seal in an axial compression between two parallel surfaces, which are square to the fluid passage or vessel axis. The seal is usually located in an open or closed groove in one of the surfaces. The seal can also be located in a retainer, which eliminates the need for machining a groove. The mating hardware when bolted, torque, clamped or fastened tightly to the surface enclosing the ring, compresses the seal, forming a positive joint.