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O-Rings For Straight Thread Tube Fitting Bosses

 Tube SizeDimensions in Inches Dimensions in Millimeters
AS568ADash #O.DVol. (in³)I.D.±C/S±I.D.±C/S±
901   3/32 .0019 .185 .005 .056 .003 4.70 0.13 1.42 0.08
902 2 1/8 .0031 .239 .005 .064 .003 6.07 0.13 1.63 0.08
903 3 3/16 .0037 .301 .005 .064 .003 7.65 0.13 1.63 0.08
904 4 1/4 .0054 .351 .005 .072 .003 8.90 0.13 1.83 0.08
905 5 5/16 .0062 .414 .005 .072 .003 10.51 0.13 1.83 0.08
906 6 3/8 .0082 .468 .005 .078 .003 11.90 0.13 1.98 0.08
907   7/16 .0102 .530 .007 .082 .003 13.46 0.18 2.08 0.08
908 8 1/2 .0137 .644 .009 .087 .003 16.36 0.23 2.20 0.08
909   9/16 .0186 .706 .009 .097 .003 17.93 0.23 2.46 0.08
910 10 5/8 .0198 .755 .009 .097 .003 19.18 0.23 2.46 0.08
911   11/16 .0326 .863 .009 .116 .004 21.92 0.23 2.95 0.10
912 12 3/4 .0345 .924 .009 .116 .004 23.47 0.23 2.95 0.10
913   13/16 .0366 .986 .010 .116 .004 25.04 0.25 2.95 0.10
914   7/8 .0386 1.047 .010 .116 .004 26.62 0.25 2.95 0.10
916 16 1 .0427 1.171 .010 .116 .004 29.74 0.25 2.95 0.10
918   1-1/8 .0489 1.355 .012 .116 .004 34.42 0.30 2.95 0.10
920 20 1-1/4 .0547 1.475 .014 .118 .004 37.46 0.36 3.00 0.10
924 24 1-1/2 .0631 1.720 .014 .118 .004 43.70 0.36 3.00 0.10
928 28 1-3/4 .0759 2.090 .018 .118 .004 53.10 0.46 3.00 0.10
932 32 2 .0843 2.337 .018 .118 .004 59.36 0.46 3.00 0.10



The 900 series boss seals are designed to seal straight thread tube fittings when they are fastened into a boss. In this type of fitting the O-Ring is not located in a conventional rectangular groove. Rather, the seal is obtained when the gland components exert a diagonal squeeze through the O-Ring cross section.