O-Rings

O-Rings

Additional Information
There are several different standards to choose from when it comes to O-ring dimensions.  The most popular in the United States is the AS568 standard for O-ring sizes and tolerances.  Maintained by the Society of Automotive Engineers, this standard allows the user to choose from five different cross-sections with inside diameters ranging from 1/32" to 26". Tube fitting boss seals are included in AS568 as 900 series O-ring sizes, and are intended for use in MS33649 (now superseded by SAE-AS5202) straight thread tube fitings. 

RT/Dygert also offers a wide array of metric sizes, in both standard and non-standard dimensions.  As a subset of the metric sizes offered, we also stock many Japanese Industrial Standard (JIS B2401) sizes. If an O-ring with special size or fluid resistance is required, RT/Dygert can provide custom O-rings, specially made to your demanding requirements.
SIZES
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Fit Groove Size
O.D.
AS568A
Dash No.
C/S
I.D.
Metric
Dimensions in Inches Nominal Size (Reference Only)
ID AS568A I.D. ± C/S Vol (in3) I.D. O.D. C/S
1 901 0.185 .005 .056 ± .003 .0019 3/32
2 902 0.239 .005 .064 ± .003 .0031 1/8
3 903 0.301 .005 .064 ± .003 .0037 3/16
4 904 0.351 .005 .072 ± .003 .0054 1/4
5 905 0.414 .005 .072 ± .003 .0062 5/16
6 906 0.468 .005 .078 ± .003 .0082 3/8
7 907 0.53 .007 .082 ± .003 .0102 7/16
8 908 0.644 .009 .087 ± .003 .0137 1/2
9 909 0.706 .009 .097 ± .003 .0186 9/16
10 910 0.755 .009 .097 ± .003 .0198 5/8
11 911 0.863 .009 .116 ± .004 .0326 11/16
12 912 0.924 .009 .116 ± .004 .0345 3/4
13 913 0.986 .010 .116 ± .004 .0366 13/16
14 914 1.047 .010 .116 ± .004 .0386 7/8
15 916 1.171 .010 .116 ± .004 .0427 1
16 918 1.355 .012 .116 ± .004 .0489 1-1/8
17 920 1.475 .014 .118 ± .004 .0547 1-1/4
18 924 1.72 .014 .118 ± .004 .0631 1-1/2
19 928 2.09 .018 .118 ± .004 .0759 1-3/4
20 932 2.337 .018 .118 ± .004 .0843 2
MATERIALS
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