O-Ring, Groove, Design, Detail, Standard, Metric, Dovetail, Dimensions

O-Ring Groove Design

Extrusion Limits       Standard AS568B       Metric       Dovetail

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Extrusion Limits & O-Ring Clearance Gaps

An o-ring is contained in a gland and forced to flow into the surface imperfections of the glands and any clearance gaps available to it.  An o-ring can perform sealing by means of squeeze under low pressure conditions. The extent of extrusion depends upon the hardness of O-ring, the pressure, and the size of the clearance gap.

Extrusion Diagram
Extrusion Diagram

Standard AS568B Groove Design

The three main types of standard groove designs are Industrial Static also called Radial, Industrial Reciprocating also called Dynamic, and Face Seals also called Axial or Flange. Radial and Dynamic seals require the presence of a diametrical clearance gap for installation. Face seals have no clearance gap, but consist of a groove cut into one flange with a flat mating flange bolted together to give a surface to surface contact. Click on each type for more details. 

Industrial Static Seals
Industrial Static Seals (Radial)
Industrial Reciprocating Seals
Industrial Reciprocating Seals (Dynamic)
Face Seal
Face Seals (Axial / Flange)

Metric Groove Design

Metric o-ring groove dimensions are listed for the most common metric cross sections with and without backup rings. We have included Static, dynamic, and pneumatic applications.

Metric Groove
Metric Groove

Dovetail Groove Design

Dovetail grooves are used to hold the O-ring in place during installation or maintenance. This groove design is relatively uncommon as it is expensive to machine and should not be used unless absolutely required. The dovetail groove construction is only recommended for O-rings with cross sections greater than .139" (3.53mm).

dovetail grooves
Dovetail Grooves (Standard)
dovetail grooves
Dovetail Grooves (Metric)

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