Rubber O-Rings for Superior Performance

Differentiate Your Sealing Performance.

Order O-Rings from the World's Largest Inventory and Production Network for Quick Delivery of Commodity or Specialty Materials.


The World's Largest O-Ring Inventory With a Same-Day Shipping Guarantee

When you need a solution, you do not want to wait months. At Marco Rubber, we believe in getting you the solutions you need - fast.

Our On-Time In-Full (OTIF) promise guarantees we'll ship any in-stock orders within 24 hours. We keep all standard-size o-rings and materials on hand, so you can get what you need fast.

We can either make or source what we don't have on hand from our extensive integrated worldwide network. Utilizing these resources, we can expedite production runs for emergency or urgent needs.

Rubber O-Rings and Specialty Materials

We offer o-rings in a wide variety of materials, many of which are in stock and available to buy online. Many specialty materials are available by request. Contact us to speak to a product expert about your custom order or to find the right material for your specific application.

Popular O-Ring Materials

View our Material Selection Guide for more information on these and other popular sealing materials.

Thanks to our extensive worldwide network, if you need it, we can source it. Our experts will work hard to find the right solution for your seal - standard or custom.

Markez® Next Generation FFKM Perfluoroelastomer

An Advanced Material For Chemically Resistant, High Pressure & High Temperature O-Rings.

Markez® FFKM delivers similar performance to major FFKM brands, with temperature resistance up to 625 °F, at a significantly lower cost.

O-Ring Material Comparison Guide

One of the most challenging parts of choosing an o-ring is identifying the material you need. Our helpful material comparison guide can help you narrow it down. (But the most helpful thing you can do is talk to one of our experts. With a pressure-free call, we can quickly help you identify exactly what you need.)

Compound #DatasheetBase MaterialColorHardness (Shore A)High Temp °F (°C)Low Temp °F (°C)Steam < 300 °FSteam < 400 °FCompression SetChemical & SolventsSunlight, Ozone, UVWear AbrasionPermeation VacuumPetroleum Oils & HydraulicsFuels & GasBrake FluidsFeatures
BUNA-N (NBR) NitrileBlack70
250
(121)
-30
(-34)
Poor
Poor
Good
Poor
Poor
Good
Good
Great
Good
Poor
Lowest cost highest inventory general purpose commodity NBR compound (available in nearly any color and durometer)
BUNA-N (NBR) NitrileBlack90
250
(121)
-30
(-34)
Poor
Poor
Good
Poor
Poor
Good
Good
Great
Good
Poor
General purpose NBR, higher pressure applications
BUNA-N (NBR) NitrileBlack70
250
(121)
-30
(-34)
Poor
Poor
Good
Poor
Poor
Good
Good
Good
Good
Poor
FDA Compliant NBR per 21 CFR 177.2600 for food contact and some medical uses
BUNA-N (NBR) NitrileBlack50
250
(121)
-30
(-34)
Poor
Poor
Fair
Poor
Poor
Good
Good
Good
Good
Poor
General purpose softer than standard NBR to help seal rough or warped glands and or lower closure force applications
BUNA-N (NBR) NitrileBlack70
275
(135)
-65
(-54)
Poor
Poor
Good
Poor
Poor
Good
Good
Great
Good
Poor
Higher performance NBR , Improved lower and higher temperature resistance and oil resistance at higher temperature than standard NBR. Similar to Parker N0794-75 and M83461
BUNA-N (NBR) NitrileBlack70
250
(121)
-30
(-34)
Poor
Poor
Fair
Poor
Poor
Good
Good
Good
Good
Poor
Metal detectable NBR for contamination detection sensors, FDA Compliant per 21 CFR 177.2600 for food contact and some Life Sci uses (additional colors available)
BUNA-N (NBR) NitrileBlack70
275
(135)
-65
(-54)
Poor
Poor
Good
Poor
Poor
Good
Good
Great
Great
Poor
Military Specification Mil-Spec AMS-P-25732 , formerly MS28775-### per Mil-P-25732C-(1)
BUNA-N (NBR) NitrileBlack75
275
(135)
-65
(-54)
Poor
Poor
Good
Poor
Poor
Good
Good
Great
Great
Poor
Military Specification Mil-Spec AMS-P-83461 F ormerly M83461/1-### per MIL-P-83461B#3, improved low temp and hydraulic fluid resistance

The information on this page is to the best of our knowledge accurate and reliable. However, Marco Rubber makes no warranty, expressed or implied, that parts manufactured from this material will perform satisfactorily in the customer's application. It's the customer's responsibility to evaluate parts prior to use.

The temperature ranges presented on this page are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.


Have Questions About Your Specific Application?

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Custom O-Rings and Tailored Solutions

Many people make the unfortunate mistake of trying to force a standard seal in an application that needs a custom one. If the team had gone with a custom rubber o-ring from the beginning, they could have avoided expensive downtime, frustrating spills, and costly yield loss.

While custom o-rings can present additional costs upfront, they are designed to save you significant amounts in the long run. But, if you work with Marco Rubber, we can often make custom rubber o-rings without additional tooling fees.

We offer a large number of customization options, including but not limited to:

  • A wide range of sizes without additional tooling fees
  • Any color or durometer
  • Medical Grade, USP Class VI, FDA, Drinking Water NSF-61, or 3A compliant
  • EMI shielding, conductive, or metal detectable
  • Explosive decompression
  • Semiconductor
  • Nuclear
  • High temperature
  • High pressure
  • Chemical resistance
  • Internal or surface lubrication
  • Specialty chemical resistance
  • Extended temperature performance
  • Coatings and treatments
  • Specialty bagging, labeling, marking, kitting, or inspection

Essentially, the customizable options are endless.

We believe customization shouldn't take long. We will follow our detailed and thorough process to quickly engineer a solution to get your application up and running. Whether you need a low-cost, disposable option or an o-ring designed to lengthen service life, we can help.

Need compliant parts? We've still got you covered. We offer materials that meet standards in heavily regulated industries like oil and gas, aerospace, drinking water, food and beverage, pharmaceutical, medical device manufacturing, and more.

As an ISO 9001:2015 certified company, we take pride in our dedication to quality and excellence. Beyond our comprehensive quality control, we offer after-market support to ensure your custom solution works.

Talk to one of our product experts for more information about custom sealing solutions.

Sizing Your O-Ring

One of the trickiest parts of choosing an o-ring is sizing. Improperly sized o-rings are a leading cause of seal failure. There is an art to determining the right size for your o-ring, so let's cover some basics.

Review gland design basics.

First, you will need to determine the way pressure works in your gland. Your operation will be one of the following:

  • Internal Pressure
  • Internal Vacuum
  • Dynamic Rod and Piston
  • Static Rod and Piston

Next, to determine your sizing, you will want to know the following gland measurements:

  • For Internal pressure:
    • Inner Diameter
    • Depth
    • Width
  • For Internal Vacuum:
    • Outer Diameter
    • Depth
    • Width
  • For Dynamic Rod and Piston:
    • Outer Diameter Sealing Width
    • D Diameter
    • E Diameter
    • F Diameter
  • Inner Diameter Sealing Width
    • II Diameter
    • I Diameter
    • G Diameter
  • For Static Rod and Piston:
    • Outer Diameter Sealing Width
    • D Diameter
    • H Gap
    • E Bore Diameter
  • Inner Diameter Sealing Width
    • H Gap
    • G Tube Diameter
    • F Gland Diameter

Now that you have your important measurements, you can use a comprehensive sizing chart to select the correct sized o-ring. The following links will take you to the corresponding sizing chart for your appropriate region:

Choosing Your Rubber O-Ring

We have given you a lot of information here, but there is so much more. We've broken down the essentials in our Complete Guide To Choosing An O-Ring. We cover topics like defining an ideal seal, identifying your application's challenges, choosing materials, sizing, picking a profile, and questions you should be asking your supplier.

Get your free copy today.

Frequently Asked Questions (FAQ)

An o-ring is a torus, or donut-shaped ring, that is made from plastic or rubber. An o-ring seal consists of the gland that houses the o-ring and the o-ring itself.

O-rings are a popular choice for sealing because they are incredibly versatile! Some of their numerous benefits include:

  • Availability in materials that withstand a wide range of pressure, temperature, and tolerance.
  • Availability in an array of colors, sizes, etc. and are very customizable.
  • Does not require critical torque on tightening.
  • Very lightweight.
  • Often a cost-effective sealing solution.
  • Long lifespans with correct application.

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