Custom / Semi-Custom O-Rings

Are you in need a custom color, size, or material o-ring/seal?  Captain O-Ring specializes in helping you determine the o-ring you need for your application as well as manufacturing seals with short lead times, quick turn around, and low minimum order quantities.

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Short Lead Times & Small Order Size Minimums

• ​Standard AS568/Metric Sizes in special materials or semi-custom colors (see below)
  • Typically produced in 4 weeks
  • Typically $200 per size minimum ($600+ minimum for colors)
• ​Custom Size O-Rings
  • Typically produced in 4-6 weeks (re-orders produced in 3-4 weeks)
  • Typically $400-$600 per size minimum​ (plus mold cost if necessary)

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O-Ring Materials

Most materials are available in durometers (hardness) from 45 to 95 Shore A.  The suitable medias listed below are only basic examples and are by no means an exhaustive list.  Please let us know the media in which your o-rings will be exposed to so that we can confirm the appropriate material that is most suitable and economical for your use.

Buna Nitrile (BN/NBR)

• -40ºF to 250ºF
• Suitable with:  Aliphatic Hydrocarbons, Petroleum Oils, Gasoline, Hydraulic Oils, Diesel Fuel, Water
• Cost Level:  $

Hydrogenated Nitrile (HNBR)

• -40ºF to 300ºF
• Suitable with:  Aliphatic Hydrocarbons, Petroleum Oils, Gasoline, Hydraulic Oils, Diesel Fuel, H2S (10%), Water    
• Cost Level:  $$

Ethylene Propylene (EPDM)

• -60ºF to 300ºF
• Suitable with:  Ammonia, Brake Fluids, Steam, UV
• Excellent weather resistance
• Cost Level:  $

Flouroelastomer (FKM) [Brand Named:  Viton®]

• 0ºF to 390ºF
• Suitable with:  Petroleum Oils, Silicone Oils, Gasoline
• Cost Level:  $$​

​​Perflouroelastomer (FFKM)

• 0ºF to 600ºF
• Suitable with:  Most Media
• Cost Level:  $$$$$

Silicone (VMQ)

• -90ºF to 430ºF
• Suitable with:  Vegetable Oil, Water, Ozone
• Cost Level:  $$

Neoprene (CR)

• -40ºF to 250ºF
• Suitable with:  Ammonia, Refrigerants, Ozone
• Cost Level:  $$

PTFE [Brand named:  Teflon®]

• -150ºF to 530ºF
• Suitable with:  Most Media
• Cost Level:  $$$$

Polyurethane (PU)

• -40ºF to 195ºF
• Suitable with:  Most Petroleum Oils
• Cost Level:  $$​

Coated O-Rings

• O-rings of various materials available with dry film coatings
• PTFE/Teflon, Graphite, and other coatings available
• Inquire for more info

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O-Ring Sizing

We stock over 25,000 mold sizes.  AS568A is the American standard for o-ring sizing.  If you need a size outside of the AS568A spectrum, we most likely have a mold for it already.  If we don't, we work directly with mold makers to get you the lowest tooling cost for your mold. This allows for a huge savings when producing odd size parts.  We can produce any size o-ring as well as any shaped parts such as V-Rings, X-Rings, etc.

O-Ring Material Colors

Captain O-Ring LLC specializes in colored o-rings.  We are capable of producing most materials in virtually any color.  We do have a list of stock colors for which we often mold common materials such as NBR.  This creates shorter lead time and slightly lower costs and minimums for these colors than completely custom colors.

If you would prefer a color that you do not see on the chart above, we can produce virtually any Pantone color for you.

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