Standard and metric oring sizes in stock. Large inventory of buna nitrile o-ring, silicone o-ring, epdm o-ring and viton o-ring sizes. We also supply a wide range of mil-spec o-rings. And for serious demanding service, we offer perfluoroelastomer o-rings including Chemraz®, Kalrez® and Simriz® o-rings.

Shown at right are some of the various o-ring and related products carried and a list of list of common standard and military spec materials. Click on a link for more information.


Quick Links:

O-Ring Sizing Chart

Standard O-Ring Compounds



O-Rings, O-Ring Kits, Mil Spec Viton Orings and More

viton o-ring


backup rings

Buna and Teflon® back-up rings. PTFE (Teflon) backups are available as
solid, split and spiral backup rings.

quad rings

Standard o-ring dimensions with four sealing surfaces available in
Buna and Viton.

square o-rings

Standard o-ring dimensions with a square cross section configuration.
Commonly available in Buna material.

viton o-rings

Spliced and vulcanized custom size o-rings to nearly any dimension.
Just specify cross section and ID.

o-ring cord

Standard and metric cross sections in buna and viton o-ring cord stock. Silicone o-ring cord and other materials are also available in inch sizes.

o-ring kit

Oring Kits provide a convenient assortment of common sizes.  Standard o-ring kits, metric o-ring kits, splicing kits, quad kits and more.  Click the Link for more info.

o-ring sizing chart

Available here is a PDF format o-ring sizing chart showing o-ring dimensions for standard size o-rings. It is grouped by cross section and sorted by inside diameter.

o-ring lube

Lubricants are often used in o-ring assembly to prevent damage, to help seat the o-ring and can offer protection as a surface film. Parker offers a standard o-lube as well as a super o-lube. Click the o-ring lubricant link above for more info.

Available O-Ring Compounds and Typical Properties

Compound Also knows as Key Characteristics Avg. Temp Range (F)
Aflas Tetrafluoroethylene / Propylene Resistant to a wide range of chemicals. -15°- 450°
Ethylene propylene diene rubber, EPDM, EP, EPM, EPR Excellent resistance to ozone, weathering, steam, water and phosphate ester type hydraulic fluids. -70°- 250°
Available Specs and Options:
NAS 1613, NSF 61, FDA
Fluorocarbon Viton ® , Fluorel ® , Fluoroelastomer, FKM,
Viton Oring
Excellent compression set and resistance to high temperature and a broad range of chemicals. -15°- 400°
Available Specs and Options:
AMS7276, AMS3216, AS3208, AS3209, M83248/1, Mil-R-83248/1 O-Rings, AMS 7276, AMS7259, AS3581, M83248/2, Mil-R-83248/2 O-Ring, AMS 7259, AMS7287, AS3485, M83485/1, Mil-R-83485, AMS 7287, Low Temp GLT Type Viton Orings. Parker V747-75, V1164-75 Viton O-Rings
Fluorosilicone Fluorinated Polysiloxane, FVMQ Similar physical properties to silicone rubber with improved fuel and mineral oil resistance but poor hot air resistance. -90°- 350°
Available Specs and Options:
MIL-DTL-25988C, AMS-R-25988 CL1 GR70, MIL-DTL-25988/1, AMS-R-25988/1 MIL-R-25988 CL1 G70, M25988/1, Blue Fluorosilicone Orings
Hydrogenated Acrylonitrile-butadiene, HNBR, HSN Improved fuel and ozone resistance over Nitrile. Often used in refrigeration systems. -25°- 300°
Neoprene Chloroprene, CR Good ozone, aging and chemical resistance. -35°- 225°
Nitrile (Buna) Acrylonitrile-butadiene Rubber, Buna-N, NBR Most common general purpose elastomer. Good for petroleum fluids. -30°- 225°
Available Specs and Options:
Mil-P-25732, MS28775, AMS-P-25732 , AMS-P-5510, MS28778, Mil-P-5510, Mil-P-83461, M83461/1, AMS-P-83461, AMS7271, AS3578, MS9020, MS9021, MS29513, AMS-P-5315, Low Temp Nitrile, FDA Nitrile, NSF Buna Orings, Parker N674-70 O-Rings
PTFE Teflon ® , Polytetrafluoroethylene Chemically inert to most substances. Excellent resistance to high temperature. Extremely low coefficiant of friction -65°- 500°
Kalrez ® , Simriz ® ,
Chemraz ® , FFKM
Excellent chemical resistance and high temperature stability. 5°- 525°
Available Specs and Options:
AMS7257D, AMS 7257
Polyurethane Polyester or Polyether Urethane, PU, AU, EU Excellent wear resistance and high tensile strength. Good for Drive Belts. -40°- 180°
Silicone Polysiloxane, VMQ, PVMQ Good heat resistance, cold flexibility and insulating properties. Low tensile strength and poor tear and wear resistance. -60°- 400°
Available Specs and Options:
AMS7267, AMS3304, AMS3357, A-A-59588 Class, 1A 2B Grade 70, AMS3337, AS9385, AS9386, AS3582, ZZ-R-765E Class 1A, 1B, 2A, 2B Grade 70, MS9385, MS9386, MS9068, FDA Silicone Oring

The information contained here is for reference only. It is believed to be reliable, but no representations, guarantees or warranties of any kind are made to its accuracy or suitability for any particular purpose. It is recommended that users conduct their own evaluations for the intended application.

Viton and Kalrez are registered trademarks of DuPont Dow Elastomers
Teflon is a registered trademark of DuPont
Chemraz is a registered trademark of Green Tweed
Simriz is a registered trademark of Simrit
Aflas is a registered trademark of 3M Company

Anchor Rubber Products
152 Rockwell Rd • Newington, CT 06111
Tel: 860-667-2628 • Fax 860-667-3059
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Newington, CT USA