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. Neoprene is also known as Chloroprene.

Neoprene resists fats, oils and petroleum products. Stands up well in sunlight. Low flammability - burns when exposed to flames, but self-extinguishes when flame is removed. Generally good ozone, aging and chemical resistance. It has good mechanical properties over a wide temperature range.

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Inside Diamter (mm)

Inside Diamter (in)

Cross Section Width (in)

Cross Section Width (mm)

Item #

Inside Diamter

Cross Section Width

Durometer

Size Reference - AS568

Inside Diameter Tolerance +/-

Cross Section Tolerance +/-

N/A 0.74 mm0.029 in N/A 0.040 in1.02 mm N/A 70 N/A -001 N/A 0.004 in0.10 mm N/A 0.003 in0.08 mm
N/A 1.07 mm0.042 in N/A 0.050 in1.27 mm N/A 70 N/A -002 N/A 0.004 in0.10 mm N/A 0.003 in0.08 mm
N/A 1.42 mm0.056 in N/A 0.060 in1.52 mm N/A 70 N/A -003 N/A 0.004 in0.10 mm N/A 0.003 in0.08 mm
N/A 1.78 mm0.070 in N/A 0.070 in1.78 mm N/A 70 N/A -004 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 2.57 mm0.101 in N/A 0.070 in1.78 mm N/A 70 N/A -005 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 2.90 mm0.114 in N/A 0.070 in1.78 mm N/A 70 N/A -006 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 3.68 mm0.145 in N/A 0.070 in1.78 mm N/A 70 N/A -007 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 4.47 mm0.176 in N/A 0.070 in1.78 mm N/A 70 N/A -008 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 5.28 mm0.208 in N/A 0.070 in1.78 mm N/A 70 N/A -009 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 6.07 mm0.239 in N/A 0.070 in1.78 mm N/A 70 N/A -010 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 7.65 mm0.300 in N/A 0.070 in1.78 mm N/A 70 N/A -011 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 9.25 mm0.364 in N/A 0.070 in1.78 mm N/A 70 N/A -012 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 10.82 mm0.426 in N/A 0.070 in1.78 mm N/A 70 N/A -013 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 12.42 mm0.489 in N/A 0.070 in1.78 mm N/A 70 N/A -014 N/A 0.005 in0.12 mm N/A 0.003 in0.08 mm
N/A 14.00 mm0.551 in N/A 0.070 in1.78 mm N/A 70 N/A -015 N/A 0.007 in0.17 mm N/A 0.003 in0.08 mm
N/A 15.60 mm0.614 in N/A 0.070 in1.78 mm N/A 70 N/A -016 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
N/A 17.17 mm0.676 in N/A 0.070 in1.78 mm N/A 70 N/A -017 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
N/A 18.77 mm0.739 in N/A 0.070 in1.78 mm N/A 70 N/A -018 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
N/A 20.35 mm0.801 in N/A 0.070 in1.78 mm N/A 70 N/A -019 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
N/A 21.95 mm0.864 in N/A 0.070 in1.78 mm N/A 70 N/A -020 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
N/A 23.52 mm0.926 in N/A 0.070 in1.78 mm N/A 70 N/A -021 N/A 0.009 in0.22 mm N/A 0.003 in0.08 mm
N/A 25.12 mm0.989 in N/A 0.070 in1.78 mm N/A 70 N/A -022 N/A 0.010 in0.25 mm N/A 0.003 in0.08 mm
N/A 26.70 mm1.051 in N/A 0.070 in1.78 mm N/A 70 N/A -023 N/A 0.010 in0.25 mm N/A 0.003 in0.08 mm
N/A 28.30 mm1.114 in N/A 0.070 in1.78 mm N/A 70 N/A -024 N/A 0.010 in0.25 mm N/A 0.003 in0.08 mm
N/A 29.87 mm1.176 in N/A 0.070 in1.78 mm N/A 70 N/A -025 N/A 0.011 in0.28 mm N/A 0.003 in0.08 mm
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