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home » products » o-ring products » o-rings

O-Rings Product Know-How

Expertise and experience to deliver tailored solutions.

Additional Resources


Useful Tools
  • o-ring calculator
  • o-ring handbook
  • understanding o-ring failures
  • Chemical Resistance Guide

Need more information?
  • Contact Us

External Links
  • ERIKS o-ring.info
  • ERIKS Rubber-Technology.info

The O-ring has become the world's most popular and versatile seal due to its simple shape, low space requirements and its availability in a vast selection of sizes and compounds to meet every industrial requirement.


O-rings are bi-directional seals, circular in shape and cross section. O-rings are generally made of an elastomeric material, but may be made of other materials such as PTFE or metal.

An o-ring seals through the deformation of the seal material by installation and media pressure to close off the gap between mating components. Higher system pressures can cause deformation through the gap, known as extrusion, resulting in seal failure. Choosing a harder seal material or installing back-up rings to support the O-ring may alleviate this problem.



Materials


Material
Temp Range
Comments
ERIKS Gereral Compound
THERMOSET ELASTOMERS
Nitrile (NBR), Buna N -40C (-40F) to 121C (250F) General service E36626 (70)
E366890 (90)
Hydrogenated Nitrile (HNBR), HSN -40C (-40F) to 150C (302F) General service E88600 (70)
E88690 (90)
Ethylene Propylene
(EPR, EPDM)
-55C (-67F) to 150C (302F) Water and solvent service E55641A (70)
Polychloroprene (CR) Neoprene® -40C (-40F) to 121C (250F) Refrigerants and water service C70
Silicone(VMQ) -59C (-75F) to 230C (446F) High temperature service E714177 (70)
Fluorosilicone(FVMQ) -60C (-76F) to 180C (356F) Military fuel service

F70

Polyacrylate (ACM/AEM) Vamac®

 
Fluorocarbon (FKM)
Viton®, Fluorel®, Technoflon®
-20C (-4F) to 200C (392F) Chemical and high temp service E51414 (75)E514320 (90)
TFE/P (FEPM)
Aflas®
-20C (-4F) to 200C (392F) Chemical and high temp service E22338 (80)
Perfluoroelastomer
(FFKM) Kalrez®, Chemraz®
-20C (-4F) to 300C (572F) Extreme chemical and high temp service Kalrez®

 

     
THERMOPLASTIC ELASTOMERS
Polyurethane
(AU, EU)
-40C (-40F) to 82C (180F) Hydraulic service PUR90
Thermoplastic Polyester (TPC-ET) Hytrel®      

     

Sizes

The tables below list approximately 2000 O-ring sizes in order by inside diameter. These O-ring sizes correspond to US Standard AS568, British Standard, Swedish, as well as many common metric sizes according to DIN and ISO standards. Most of these sizes are readily available from ERIKS stock in the following materials:

  • Nitrile NBR
  • Fluoroelastomer FKM (Viton®) 75 and 90 Shore A
  • Perfluoroelastomer FFKM (Kalrez®) 75 Shore A
  • Ethylene-propylene EP, EPDM 70° Shore A
  • Silicone VMQ 70 Shore A
  • PTFE
  • Teflex FEP/Viton®
  • Teflex FEP/VMQ

Our list of standards is continually being expanded. Please contact us for additional sizes not indicated here.

Standard O-ring Sizes
000 Series 004 to 050 cross section Diameters w = .070 ± .003 inches, w = 1,78 ± 0,08 mm
100 Series 102 to 178 cross section Diameters w = ..103 ± .003 inches, w = 2,62 ± 0,08 mm
200 Series 201 to 285 cross section Diameters w = 139 ± .004 inches, w = 3,53 ± 0,10 mm
300 Series 309 to 395 cross section Diameters w = .210 ± .005 inches, w = 5,33 ± 0,13 mm
400 Series 425 to 475 cross section Diameters w = .275 ± .006 inches, w = 6,99 ± 0,15 mm
900 Series  

Technical and Logistic Services



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