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Custom Molded Rubber
O-rings and Seals
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Materials and Elastomers
Due to the number of interacting forces, it is STRONGLY RECOMMENDED THAT YOUR ELASTOMER SELECTION BE RIGOROUSLY TESTED IN THE ACTUAL APPLICATION, performance assumptions must be checked so that you are certain that all variables have been carefully considered
Custom Molded Rubber
Dynamic Radial Seal Design
In dynamic radial seal applications the O-ring is squeezed radially and subjected to reciprocating motion either intermittent or continuous. Thus O-rings used in these types of applications are subjected to friction between the parts of the gland. The table below lists recommended dimensions for Dynamic Radial seal glands by AS-568A O-ring dash numbers.
     
 
Dynamic Radial Seal Design
  
     
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AS 568 Dynamic Radial Seal Gland Design
Guidelines		 Back
     
Static Radial Seal Design
In a static radial seal application the O-ring is squeezed between the inner I.D. and the outer O.D. surfaces of the O-ring, with no relative motion between parts of the gland that come in contact with the O-ring. The table below lists recommended dimensions for static radial seal glands by AS-568A O-ring dash numbers.
     
 
Static Radial Seal Design
  
     
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AS 568 Static Radial Seal Gland Design
Guideline		 Back
     
Dynamic Reciprocating Seal Design
In Reciprocating sealing applications there is a back and forth or reciprocating motion along the shaft axis between the inner and outer parts of the gland. O-rings are often referred to as piston and rod seals when used in these types of applications. The table below lists recommended dimensions for Dynamic Reciprocating seal glands by AS-568A O-ring dash numbers.
     
 
Dynamic Reciprocating Seal Design
  
     
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AS 568 Dynamic Reciprocating Seal Gland Design
Guideline		 Back
     
Static Axial Seal Design - Internal Pressure
In a static axial seal application the squeeze is on both the top and bottom of the O-rings cross section. Static axial seals are typically used in face seal applications. The table below lists recommended dimensions for static axial (internal pressure) seal glands by AS-568A O-ring dash numbers.
     
 
Static Axial Seal Design
  
     
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AS 568 Static Axial Seal Gland Design - Internal Pressure
Guideline		 Back
     
Static Axial Seal Design - External Pressure
In a static axial seal application the squeeze is on both the top and bottom of the O-rings cross section. Static axial seals are typically used in face seal applications. The table below lists recommended dimensions for static axial (external pressure) seal glands by AS-568A O-ring dash numbers.
     
 
Static Axial Seal Design
  
     
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AS 568 Static Axial Seal Gland Design - External Pressure
Guideline		 Back
     
Dynamic Rotary Seal Design
In a dynamic rotary seal application a turning shaft protrudes through the I.D. of an o-ring, the o-ring then becoming a seal. The table below lists recommended dimensions for dynamic rotary seal glands by AS-568A O-ring dash numbers.
     
 
Dynamic Rotary Seal Design
  
     
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AS 568 Dynamic Rotary Seal Gland Design
Guideline		 Back
     
Static Crush Seal Design
In crush seal applications the O-ring is squeezed at an angle relative to its cross section. In these applications the O-ring is completely confined and pressure deformed within a 45º triangular gland, as depicted. The table below lists recommended dimensions for static crush seal glands by AS-568A O-ring dash numbers.
     
 
Static Crush Seal Design
  
     
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AS 568 Static Crush Seal Gland Design
Guideline		 Back
     
Dovetail Seal Design
In a dovetail application the O-ring squeeze is primarily axial in direction, where a valve exerts force on the top and bottom of the seals surfaces. Typically used in static or slow moving applications the dovetail glands purpose is to properly hold the O-ring in place during machine operation. The table below lists recommended dimensions for Dovetail seal glands by AS-568A O-ring dash numbers.
     
 
Dovetail Seal Design
  
     
  Click for
AS 568 Dovetail Seal Gland Design
Guideline		 Back
Seal Types
 
Dynamic Radial Seal Design   Static Radial Seal Design   Dynamic Reciprocating Seal Design   Static Axial Seal Design
Detailed Description
Basic Information		   Detailed Description
Basic Information		   Detailed Description
Basic Information		   Detailed Description
Basic Information
             
Static Axial Seal Design   Dynamic Rotary   Static Crush Seal Design   Dovetail Seal Design
Detailed Description
Basic Information		   Detailed Description
Basic Information		   Detailed Description
Basic Information		   Detailed Description
Basic Information
O-ring applications are classified in terms of relative motion.

In a Static seal application their is little to no relative motion between the parts of the gland that come in contact with the O-ring. Static seals are commonly categorized according to the direction of the squeeze that is applied to the O-ring. The two basic directions of squeeze are axial and radial.

In Dynamic sealing applications their is relative motion between the parts of the gland. Therefore O-rings are subject to friction against the gland. This movement creates design challenges different from those of static applications. Radial squeeze on the O-ring is the most common dynamic application and can be further classified by reciprocating, rotary or oscillating motion.

For more information please contact one of our project managers at 1.800.227.3539 ext.19
O-ring Gland Design » Dynamic and Static Applications