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Calculating Minimum and Maximum O-Ring Compression

The following formulas can act as a guide for calculating minimum and maximum O-ring compression when designing for sealing applications. The formulas should be used as a guide only. Apple Rubber engineers can assist you in determining exact specifications for your particular application (for more information see Section 12 Formulas in the Seal Design Guide).

O-Ring Compression Calculations for Piston and Bore



Male Radial Seal

*Equations based on maximum O-Ring Cross Section, Minimum Groove depth and filling 90% of the groove.

Legend

A =
Min. Bore Diameter
E =
Max. O-Ring Cross Section
B =
Max. Bore Diameter
F =
Min. O-Ring Cross Section
C =
Min. Groove Diameter
G =
Min. Piston Diameter
D =
Max. Groove Diameter

Concentric Eccentric

This information is also available in Apple Rubber's MicrOring™ brochure.

O-RING RULE OF THUMB #6

For reciprocating seals - passing O-rings over ports is not recommended. Nibbling and premature wear and seal failure will result. » Learn More

 
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