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Explore our AS-568 & Extended Standard Size O-Rings including our new 5/32" Nominal Cross Section O-Rings. Precision Associates' O-Rings are available off the shelf in several standard compounds. Or try O-Rings in one of 1,200+ specialty materials in 20 polymer groups, including Viton®, AFLAS®, EPDM, Nitrile, HNBR (HSN), XNBR, Neoprene®, Butyl, XNBR, Silicone, Fluorosilicone, Perfluoroelastomer, Urethane, Hypalon®, and Hydrin®.

Click here to view our 48 (5Mb) Catalog illustrated with full-size drawings of Standard Size O-Rings plus Dimensions and Tolerances.
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Item #

C/S (inches)

C/S Tolerance (±)

I.D. (inches)

I.D. Tolerance (±)

O.D. (REF) (inches)

Nominal C/S (inches)

Nominal I.D. (inches)

Nominal O.D. (inches)

Metric C/S (mm)

Metric I.D. (mm)

Metric O.D. (mm)

N/A 0.210 N/A 0.005 N/A 0.350 N/A 0.005 N/A 0.770 N/A 3/16 N/A 3/8 N/A 3/4 N/A 5.3 N/A 8.9 N/A 19.6
N/A 0.210 N/A 0.005 N/A 0.412 N/A 0.005 N/A 0.832 N/A 3/16 N/A 7/16 N/A 13/16 N/A 5.3 N/A 10.5 N/A 21.1
N/A 0.210 N/A 0.005 N/A 0.475 N/A 0.005 N/A 0.895 N/A 3/16 N/A 1/2 N/A 7/8 N/A 5.3 N/A 12.1 N/A 22.7
N/A 0.210 N/A 0.005 N/A 0.537 N/A 0.007 N/A 0.959 N/A 3/16 N/A 9/16 N/A 15/16 N/A 5.3 N/A 13.6 N/A 24.4
N/A 0.210 N/A 0.005 N/A 0.600 N/A 0.009 N/A 1.022 N/A 3/16 N/A 5/8 N/A 1 N/A 5.3 N/A 15.2 N/A 26.0
N/A 0.210 N/A 0.005 N/A 0.662 N/A 0.009 N/A 1.084 N/A 3/16 N/A 11/16 N/A 1 1/16 N/A 5.3 N/A 16.8 N/A 27.5
N/A 0.210 N/A 0.005 N/A 0.725 N/A 0.010 N/A 1.147 N/A 3/16 N/A 3/4 N/A 1 1/8 N/A 5.3 N/A 18.4 N/A 29.1
N/A 0.210 N/A 0.005 N/A 0.787 N/A 0.010 N/A 1.209 N/A 3/16 N/A 13/16 N/A 1 3/16 N/A 5.3 N/A 20.0 N/A 30.7
N/A 0.210 N/A 0.005 N/A 0.850 N/A 0.010 N/A 1.270 N/A 3/16 N/A 7/8 N/A 1 1/4 N/A 5.3 N/A 21.6 N/A 32.3
N/A 0.210 N/A 0.005 N/A 0.912 N/A 0.010 N/A 1.334 N/A 3/16 N/A 15/16 N/A 1 5/16 N/A 5.3 N/A 23.2 N/A 33.9
N/A 0.210 N/A 0.005 N/A 0.975 N/A 0.010 N/A 1.395 N/A 3/16 N/A 1 N/A 1 3/8 N/A 5.3 N/A 24.8 N/A 35.4
N/A 0.210 N/A 0.005 N/A 1.037 N/A 0.010 N/A 1.457 N/A 3/16 N/A 1 1/16 N/A 1 7/16 N/A 5.3 N/A 26.3 N/A 37.0
N/A 0.210 N/A 0.005 N/A 1.100 N/A 0.012 N/A 1.520 N/A 3/16 N/A 1 1/8 N/A 1 1/2 N/A 5.3 N/A 27.9 N/A 38.6
N/A 0.210 N/A 0.005 N/A 1.162 N/A 0.012 N/A 1.582 N/A 3/16 N/A 1 3/16 N/A 1 9/16 N/A 5.3 N/A 29.5 N/A 40.2
N/A 0.210 N/A 0.005 N/A 1.225 N/A 0.012 N/A 1.645 N/A 3/16 N/A 1 1/4 N/A 1 5/8 N/A 5.3 N/A 31.1 N/A 41.8
N/A 0.210 N/A 0.005 N/A 1.287 N/A 0.012 N/A 1.707 N/A 3/16 N/A 1 5/16 N/A 1 11/16 N/A 5.3 N/A 32.7 N/A 43.4
N/A 0.210 N/A 0.005 N/A 1.350 N/A 0.012 N/A 1.770 N/A 3/16 N/A 1 3/8 N/A 1 3/4 N/A 5.3 N/A 34.3 N/A 45.0
N/A 0.210 N/A 0.005 N/A 1.475 N/A 0.015 N/A 1.895 N/A 3/16 N/A 1 1/2 N/A 1 7/8 N/A 5.3 N/A 37.5 N/A 48.1
N/A 0.210 N/A 0.005 N/A 1.600 N/A 0.015 N/A 2.020 N/A 3/16 N/A 1 5/8 N/A 2 N/A 5.3 N/A 40.6 N/A 51.3
N/A 0.210 N/A 0.005 N/A 1.725 N/A 0.015 N/A 2.145 N/A 3/16 N/A 1 3/4 N/A 2 1/8 N/A 5.3 N/A 43.8 N/A 54.5
N/A 0.210 N/A 0.005 N/A 1.850 N/A 0.015 N/A 2.270 N/A 3/16 N/A 1 7/8 N/A 2 1/4 N/A 5.3 N/A 47.0 N/A 57.7
N/A 0.210 N/A 0.005 N/A 1.975 N/A 0.018 N/A 2.395 N/A 3/16 N/A 2 N/A 2 3/8 N/A 5.3 N/A 50.2 N/A 60.8
N/A 0.210 N/A 0.005 N/A 2.100 N/A 0.018 N/A 2.520 N/A 3/16 N/A 2 1/8 N/A 2 1/2 N/A 5.3 N/A 53.3 N/A 64.0
N/A 0.210 N/A 0.005 N/A 2.225 N/A 0.018 N/A 2.645 N/A 3/16 N/A 2 1/4 N/A 2 5/8 N/A 5.3 N/A 56.5 N/A 67.2
N/A 0.210 N/A 0.005 N/A 2.350 N/A 0.018 N/A 2.770 N/A 3/16 N/A 2 3/8 N/A 2 3/4 N/A 5.3 N/A 59.7 N/A 70.4
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