O-ring Slot
O Ring Dovetail Slot
An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. Created Date: 1/13/2020 9:08:49 AM. ISO 3601 Metric O-Rings Size Chart Issued by the International Organization for Standardization, the ISO 3601 standard contains two groups of O-Rings, Class A and Class B. Class A corresponds to the American standard AS 568B in its current format (the 900 series tube fitting O-Rings are not included). And Metric O-Ring Sizes, Quad-Ring Seals, Rubber X-Ring Seals, Rubber Square-Ring Seals The proper o-ring size is a fundamental aspect of proper o-ring performance. Whether your application conforms to U.S., Japanese JIS, British BS, or Common Metric sizing for o-rings, these o-ring size charts will help you locate the right o-ring size. O-rings are manufactured according to metric and im- perial international standards such as AS-568B, DIN ISO 3601 and JIS. Custom sizes of almost any dimen- sion are possible such as miniature O-rings and special O-rings with large dimensions.
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- General rule is 0-5%
- % cross section reduction due to stretch about half of the % ID stretch
- Excessive clearance and or pressure can result in sealextrusion and failure
- Consider use of Back-Ups or product selection with large gaps or > pressure
- Tolerances should be considered for the O-Ring and the gland
O-Ring Gland Surface Finish - Static surfaces
-16Ra to seal gas
- Dynamic Surfaces: 8 to 16Ra
- Lower durometer materials can be used to seal rough surface finishes
- Corners should be chamfered to limit damage during seal installation
- Gland volume vs. O-Ring volume
- About 25% void space or 75% nominal fill
- Narrower groove for sealing vacuum or gas
O-Ring Eccentricity & Side Loading - Can open too wide a clearance gap and result in extrusion of one portion of seal leading to leaks
High Pressure Extrusion Most o-rings are designed to operate at pressures up to 1,500 psi. At higher pressures, the material must have enough strength to resist extruding into the clearance gap. The chart shows the recommended combined limits of clearance, gap, material hardness and system pressure differential. To avoid extrusion at high temperature, reduce the extrusion gap, increase the seal material hardness or add a back-up ring to the o-ring but will require a wider gland.
O Ring Dovetail Slot
O-ring Slot Design Calculator
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