Products » O-Rings


NCS carries a variety of O-rings from standard AS568A, JIS and Metric in stock in various compounds. We also carry Back Up Rings, Square Rings, Viton® O-Rings and Quad-Rings® in a variety of materials.

Our NorthCo Metrics division can identify and source virtually all your metric product needs. We offer a variety of materials for all product types.

In addition, we offer a full range of metric O-rings in both standard and more exotic materials. We also offer large and heavy-duty seals and v-packings for the forging and steel industry.

NorthCo Metrics can also supply a full range of rod and piston seals for all fluid power applications. Contact us today for more information or to tell us about your o-ring needs!


  • Buna-N (Nitrile)
  • Viton®* (Fluorocarbon)
  • Silicone
  • EPDM (Ethylene Propylene)
  • Chemraz®§
  • Kalrez®†
  • Simriz®†
  • Teflon® (PTFE)
  • Neoprene®*
  • GRS
  • Natural Rubber
  • Butyl
  • Hydrogenated Nitrile Rubber (HNBR)
  • Aflas®‡
  • Carboxylated Nitrile
  • Hypalon® *
  • Santoprene
  • Geolast® (Advanced Elastomer System)
  • Polyurethane
  • Rubber Urethane
  • SBR
  • Aluminum
  • Silver
  • Copper
  • Soft Iron
  • Mild Steels
  • Annealed Nickel
  • Nickel
  • Monel
  • Tantalum
  • Stainless Steel
  • Inconel
  • Titanium

* DuPont Performance Elastomers | § Product of Green Tweed
† Product of Simrit | ‡ Product of ACG Chemicals


For a complete list of standard AS568A O-ring sizes, download our O-ring Size Reference Guide. We supply the complete range of inch and metric sizes in a wide variety of elastomeric O-ring materials. We are also your single source for inch and metric seals!


Compression Molded Large O-Rings

One cross section > One production line > Dimensions without limits!

No need to worry about the sizes of molds and presses! This new production system outputs large o-rings at any dimension you need and with the highest mechanical properties.

Click here for information on our compression molded large o-rings.

Specialized NSF Compounds

We carry a line of specialized NSF compounds (NSF 51 and NSF 61) utilized in the water, food and food processing equipment industries. If you are interested in these compounds, please contact us!

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