Standard O-Rings are available in 369 sizes as set up by the Aerospace Standard 568 published by the Society of Automotive Engineers. These sizes are designated by dash numbers shown on the 568 DASH Chart and are standardized by imperial dimensions. Standard O-Rings are specified by their inside diameter and cross section width. AS568 is the most commonly used standard in the U.S. for aerospace, automotive and general industrial applications. For more information, please see: Aerospace Standard 568 Dash Number, Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.

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Inside Diamter (mm)

Inside Diamter (in)

Cross Section Width (in)

Cross Section Width (mm)

Item #

Inside Diamter

Cross Section Width

Size Reference - AS568

Inside Diameter Tolerance +/-

Cross Section Tolerance +/-

-001 PTFE N/A 0.74 mm0.029 in N/A 0.040 in1.02 mm N/A -001 N/A 0.004 in0.10 mm N/A 0.003 in0.08 mm
-002 PTFE N/A 1.07 mm0.042 in N/A 0.050 in1.27 mm N/A -002 N/A 0.004 in0.10 mm N/A 0.003 in0.08 mm
-003 PTFE N/A 1.42 mm0.056 in N/A 0.060 in1.52 mm N/A -003 N/A 0.004 in0.10 mm N/A 0.003 in0.08 mm
-004 PTFE N/A 1.78 mm0.070 in N/A 0.070 in1.78 mm N/A -004 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-005 PTFE N/A 2.57 mm0.101 in N/A 0.070 in1.78 mm N/A -005 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-006 PTFE N/A 2.90 mm0.114 in N/A 0.070 in1.78 mm N/A -006 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-007 PTFE N/A 3.68 mm0.145 in N/A 0.070 in1.78 mm N/A -007 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-008 PTFE N/A 4.47 mm0.176 in N/A 0.070 in1.78 mm N/A -008 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-009 PTFE N/A 5.28 mm0.208 in N/A 0.070 in1.78 mm N/A -009 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-010 PTFE N/A 6.07 mm0.239 in N/A 0.070 in1.78 mm N/A -010 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-011 PTFE N/A 7.65 mm0.300 in N/A 0.070 in1.78 mm N/A -011 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-012 PTFE N/A 9.25 mm0.364 in N/A 0.070 in1.78 mm N/A -012 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-013 PTFE N/A 10.82 mm0.426 in N/A 0.070 in1.78 mm N/A -013 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-014 PTFE N/A 12.42 mm0.489 in N/A 0.070 in1.78 mm N/A -014 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
-015 PTFE N/A 14.00 mm0.551 in N/A 0.070 in1.78 mm N/A -015 N/A 0.007 in0.17 mm N/A 0.003 in0.08 mm
-016 PTFE N/A 15.60 mm0.614 in N/A 0.070 in1.78 mm N/A -016 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
-017 PTFE N/A 17.17 mm0.676 in N/A 0.070 in1.78 mm N/A -017 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
-018 PTFE N/A 18.77 mm0.739 in N/A 0.070 in1.78 mm N/A -018 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
-019 PTFE N/A 20.35 mm0.801 in N/A 0.070 in1.78 mm N/A -019 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
-020 PTFE N/A 21.95 mm0.864 in N/A 0.070 in1.78 mm N/A -020 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
-021 PTFE N/A 23.52 mm0.926 in N/A 0.070 in1.78 mm N/A -021 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
-022 PTFE N/A 25.12 mm0.989 in N/A 0.070 in1.78 mm N/A -022 N/A 0.010 in0.25 mm N/A 0.003 in0.08 mm
-023 PTFE N/A 26.70 mm1.051 in N/A 0.070 in1.78 mm N/A -023 N/A 0.010 in0.25 mm N/A 0.003 in0.08 mm
-024 PTFE N/A 28.30 mm1.114 in N/A 0.070 in1.78 mm N/A -024 N/A 0.010 in0.25 mm N/A 0.003 in0.08 mm
-025 PTFE N/A 29.87 mm1.176 in N/A 0.070 in1.78 mm N/A -025 N/A 0.011 in0.28 mm N/A 0.003 in0.08 mm
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