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O-ring Application Design Guide
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Fast Dash O-ring Application Design Guide
Use our free design tables for AS-568A standard industrial reciprocating and static o-ring applications. Select the type of application you are designing for to view the corresponding design guidelines. 
Rod Seal -  I.D. designed

End Cap Seal - I.D. designed

Piston Seal - O.D. designed

Plug Seal - O.D. designed

Flange Seal - O.D./I.D. designed


To get the dimensions of an AS-568A o-ring submit the dash number. To get a dash number based on dimensions select the cross-section and either the actual ID, or the actual OD. Then press submit to get your "Fast Dash" answer.

Dash No.    Cross-Section: (inches)
.070 .103 .139 .210 .275
Actual ID 
Actual OD  

For Metric (mm) - click here

AS-568A Dash Numbers and Cross-section Table

O-RING SIZE
AS-568
Dash Numbers

Cross Section
Nominal

inches
Cross Section
Actual

inches

Tolerance
+/- inches
-004 thru -050 1/16 .070 .003
-102 thru -178 3/32 .103 .003
-201 thru -284 1/8 .139 .004
-309 thru -395 3/16 .210 .005
-425 thru -475 1/4 .275 .006

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Copyright 2009 Seals Eastern, Inc.

FastDash is a trademark of Seals Eastern, Inc.; OringOnline is a registered trademark of Seals Eastern, Inc.; 7182 is a trademark of Seals Eastern, Inc.; AFLAS is a registered trademark of Asahi Glass Co., Ltd.; Viton is a registered trademark of Dupont Performance Elastomers, LLC.