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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.
Unit of Measure

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)

Material

Duro Range

Class 7 Clean Room Medical Grade
N/A 0.040 N/A 0.003 N/A 0.029 N/A 0.004 N/A 0.109 N/A 1/32 N/A 1/32 N/A 3/32 N/A 1.0 N/A 0.7 N/A 2.8 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.040 N/A 0.003 N/A 0.070 N/A 0.005 N/A 0.150 N/A 1/32 N/A 5/64 N/A 9/64 N/A 1.0 N/A 1.8 N/A 3.8 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.050 N/A 0.003 N/A 0.042 N/A 0.004 N/A 0.142 N/A 3/64 N/A 3/64 N/A 9/64 N/A 1.3 N/A 1.1 N/A 3.6 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.060 N/A 0.003 N/A 0.056 N/A 0.004 N/A 0.176 N/A 1/16 N/A 1/16 N/A 11/64 N/A 1.5 N/A 1.4 N/A 4.5 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.070 N/A 0.003 N/A 0.070 N/A 0.005 N/A 0.210 N/A 1/16 N/A 5/64 N/A 13/64 N/A 1.8 N/A 1.8 N/A 5.3 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.070 N/A 0.003 N/A 0.101 N/A 0.005 N/A 0.241 N/A 1/16 N/A 7/64 N/A 15/64 N/A 1.8 N/A 2.6 N/A 6.1 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.070 N/A 0.003 N/A 0.114 N/A 0.005 N/A 0.254 N/A 1/16 N/A 1/8 N/A 1/4 N/A 1.8 N/A 2.9 N/A 6.5 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.070 N/A 0.003 N/A 0.145 N/A 0.005 N/A 0.285 N/A 1/16 N/A 5/32 N/A 9/32 N/A 1.8 N/A 3.7 N/A 7.2 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.070 N/A 0.003 N/A 0.176 N/A 0.005 N/A 0.316 N/A 1/16 N/A 3/16 N/A 5/16 N/A 1.8 N/A 4.5 N/A 8.0 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
N/A 0.070 N/A 0.003 N/A 0.208 N/A 0.005 N/A 0.348 N/A 1/16 N/A 7/32 N/A 11/32 N/A 1.8 N/A 5.3 N/A 8.8 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 N/A 30 ±5 40 ±5 50 ±5 60 ±5 70 ±5 80 ±5 90 ±5 N/A Not Required Required
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