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®.

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Unit of Measure
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.029 inch I.D and .109 inch O.D. (REF) Standard Size O-Ring
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.070 inch I.D and .150 inch O.D. (REF) Standard Size O-Ring
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.042 inch I.D and .142 inch O.D. (REF) Standard Size O-Ring
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.056 inch I.D and .176 inch O.D. (REF) Standard Size O-Ring
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.070 inch I.D and .210 inch O.D. (REF) Standard Size O-Ring
C/S (inches) N/A 0.040 N/A 0.040 N/A 0.050 N/A 0.060 N/A 0.070
C/S Tolerance (±) N/A 0.003
I.D. (inches) N/A 0.029 N/A 0.070 N/A 0.042 N/A 0.056 N/A 0.070
I.D. Tolerance (±) N/A 0.004 N/A 0.005 N/A 0.004 N/A 0.004 N/A 0.005
O.D. (REF) (inches) N/A 0.109 N/A 0.150 N/A 0.142 N/A 0.176 N/A 0.210
Nominal C/S (inches) N/A 1/32 N/A 1/32 N/A 3/64 N/A 1/16 N/A 1/16
Nominal I.D. (inches) N/A 1/32 N/A 5/64 N/A 3/64 N/A 1/16 N/A 5/64
Nominal O.D. (inches) N/A 3/32 N/A 9/64 N/A 9/64 N/A 11/64 N/A 13/64
Metric C/S (mm) N/A 1.0 N/A 1.0 N/A 1.3 N/A 1.5 N/A 1.8
Metric I.D. (mm) N/A 0.7 N/A 1.8 N/A 1.1 N/A 1.4 N/A 1.8
Metric O.D. (mm) N/A 2.8 N/A 3.8 N/A 3.6 N/A 4.5 N/A 5.3
Material N/A Chloroprene Rubber (CR) (Neoprene®) Ethylene Propylene Diene Monomer (EPDM) Fluoroelastomer (FKM) Fluorosilicone Hydrogenated Nitrile Butadiene Rubber (HNBR) Hydrogenated Nitrile Butadiene Rubber (XNBR) Nitrile Butadiene Rubber (NBR) Perfluoroelastomer (FFKM) Silicone Tetrafluoroethylene Propylene (Aflas®) Urethane
Duro Range N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5
Class 7 Clean Room Medical Grade N/A Not Required Required
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