STANDARD O-RINGS
AS568 O-Ring Size Chart

AS568 O-Ring Size Chart

To identify which AS568B standard O-ring size is appropriate for your application, you must know the required cross-sectional diameter and either the inside diameter or the outside diameter.

O-Ring Size
AS568B

W
Cross Section

L Squeeze G
Groove Width
R Description
Nominal Actual Gland Depth Actual % Liquids Vacuum
and Gases
Groove Radius O-Ring Size
AS568B
-004 to -050 1/16 .070 +/- .003 .050 to .054 .013 to .023 19 to 32 .101 to .107 .084 to .089 .005 to .015 O-Ring Size
AS568B
-102 to -178 3/32 .103 +/- .003 .074 to .080 .020 to .032 20 to 30 .136 to .142 .120 to .125 .005 to .015 O-Ring Size
AS568B
-201 to -284 1/8 .139 +/- .004 .101 to .107 .028 to .042 20 to 30 .177 to .187 .158 to .164 .010 to .025 O-Ring Size
AS568B
-309 to -395 3/16 .210 +/- .005 .152 to .162 .043 to .063 21 to 30 .270 to .290 .239 to .244 .020 to .035 O-Ring Size
AS568B
-425 to -475 1/4 .275 +/- .006 .201 to .211 .058 to .080 21 to 29 .342 to .362 .309 to .314 .020 to .035 O-Ring Size
AS568B
Special 3/8 .375 +/- .007 .276 to .286 .082 to .108 22 to 28 .475 to .485 .419 to .424 .030 to .045 O-Ring Size
AS568B
Special 1/2 .500 +/- .008 .370 to .380 .112 to .138 22 to 27 .638 to .645 .560 to .565 .030 to .045 O-Ring Size
AS568B