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O-rings Manufacturers and Suppliers

IQS Directory provides a comprehensive list of o-ring manufacturers and suppliers. Use our website to review and source top o-ring manufacturers with roll over ads and detailed product descriptions. Find o-ring companies that can design, engineer, and manufacture o-rings to your companies specifications. Then contact the o-ring companies through our quick and easy request for quote form. Website links, company profile, locations, phone, product videos and product information is provided for each company. Access customer reviews and keep up to date with product new articles. Whether you are looking for manufacturers of o-ring sealing devices, rubber o-rings, o-ring valves, or customized o-rings of every type, this is the resource for you.

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Manufacturer of o-ring static seals, metric o-ring seals, buna o-rings, Teflon® o-rings, Viton® o-rings, o-ring kits, silicone o-rings, o-ring gaskets, EPDM o-rings, metal o-rings, static o-rings, rubber o-rings, o-ring seals and more. Packing Seals & Engineering serves many industries from automotive to pump applications. Since 1959, we have been providing customers with solutions that work.
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Since 1989, we have been an o-ring distributor. We offer commercial, FDA, military, metric o-rings, caps, plugs, gaskets & more. Custom, rubber o-rings, metal o-rings, diaphragms, face seals and non-standard o-rings are also offered. Viton® o-rings & o-ring kits are supplied by Arizona Sealing Devices, making us the source of seals, die cutting, oil seals, packings, sheeting, vee rings, etc.
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A leading o-ring manufacturer of quality metric seals for industries worldwide, defines Allied Metrics Seals & Fasteners. We offer FDA-approved elastomers, Teflon® seals, o-rings & much more. Choose from o-ring sizes, metal & plastic o-rings, o-ring kits, o-ring seals, silicone o-rings, EPDM o-rings, static o-rings, etc. Call/visit our website for more information about our products & services!
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Captain O-Ring® is an o-ring and rubber parts specialty manufacturer dealing in o-rings and rubber parts for industrial and recreational (paintball, scuba, firearms, outdoors) applications. With connections to distribution networks around the globe, we have the ability to supply bulk orders of standard parts as well as any size, big or small, runs of custom manufactured parts at economical prices.
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Atlantic Rubber, an o-ring manufacturer, can satisfy your needs for quality precision o-rings that meet ASTM, SAE, AMS, AS568, JIS, Metric or other specific requirements. Choose from static o-rings, metal o-rings, o-ring kits, plastic o-rings & more. We cut to length & vulcanize our molded o-rings for heavy duty static applications. Small to large orders in a full range of sizes & materials:
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Sealing Devices is a leading North American distributor & fabricator of o-rings, gaskets, seals, adhesives and EMI shielding for industrial, aerospace, medical and military applications. Our products can be from our stock inventory or custom made to fit your specific application. We look forward to working with you and finding solutions to your sealing needs. Visit our website today!
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Industry Information


All standard o-rings have round profiles, doughnut-like and thin, although the applications a certain o-ring is designed for affects its thickness. However, some gasket styles that perform exactly the same functions as o-rings have flat or square profiles. O-rings are manufactured by a relatively cost-effective process, making them a simple, fairly cost-effective solution for machinery and equipment manufacturers who require seals between parts where leaks are likely to occur. O-rings are made in a wide range of synthetic and natural elastomers, each of which carries different application-specific properties. The most common types of rubber o-rings include viton o-rings, teflon o-rings, neoprene o-rings, silicone o-rings and nitrile o-rings. Some of these plastic materials create clear o-rings, particularly the silicone base. The food and medical fields use the clear o-rings often. Metal o-rings are also widely available. O-rings are made according to non-metric measurements or as metric o-rings, and o-ring suppliers often supply bulk o-rings of assorted sizes, including large o-rings in o-ring kits to manufacturers who use o-rings commonly in manufacturing.

Hydraulic, pneumatic and vacuum flow applications, whether they involve static parts or moving joints, use o-rings of all sizes and materials to create seals where tubes or other equipment join together. Aerospace and aviation industries in particular rely on o-rings in critical applications, such as engine turbines and brake systems. O-rings used in aerospace applications require extremely high resistance to extreme temperatures and include materials such as silicone, EPDM, perfluoroelastomer and fluorosilicone. Petro-chemical hydraulic applications in oil refineries, chemical processing and water treatment facilities use o-ring seals with high chemical and fuel-resistance made from materials such as teflon, nitrile, viton and perfluoroelastomer. Silicone o-rings are especially resistant to UV weathering, dry heat and wide temperature swings, while neoprene is often used to seal refrigerants such as freon in liquid chiller systems and heat exchangers. Due to o-rings' low manufacturing cost, some rubber o-rings and silicone o-rings are used in jewelry accessories as necklace strings and around ear plugs. The range of o-ring sizes manufactured and distributed is another positive characteristic that makes o-rings popular.

Viewed at a cross-section, o-rings are disc-shaped; when placed within a groove between two joints and pressure is applied to the o-ring, the disc-shaped cross-section deforms. This compression deformation is what causes o-rings to create a seal, and as more pressure is applied either within or without the seal, the o-ring deforms even more within the groove as it is pressed up against one side, further reinforcing the seal. O-rings' sealing capabilities are based on their resilience, or their ability to retain their original shape long after deformation. Static o-rings, used to seal two rigid, nonmoving parts, will remain stationary and therefore do not require any lubricants. O-rings joining joints with motion typically require o-ring lubricant to reduce wear; lubricants are often made from elastomers such as silicone or neoprene, but manufacturers must be careful never to use o-ring lubricant with an o-ring made from the same materials, which can cause erosion of the o-ring. Besides the use of a lubricant, o-rings may also be covered or encapsulated within Teflon, which protects the weaker o-ring materials from natural deterioration as well as protecting it from harmful chemicals. Teflon is the toughest of the synthetic rubber materials used for o-ring construction, although they are not as flexible as other substances and therefore are used only in certain applications.

O-rings have been the center of many important technological advances in the last several decades, specifically since the disaster of the space shuttle Challenger takeoff in 1986, which was traced back to a faulty o-ring. Due to below freezing temperatures the morning of the launch, the o-rings in the Challenger's solid rocket boosters had deformed permanently, failing to decompress and create an effective seal. Extreme temperature endurance had not been taken into account during the o-rings' engineering, and as a result the Challenger exploded during liftoff, killing all seven of its crewmembers. Since the Challenger disaster, the o-ring and gasketing industries have made extensive investigations into material properties and endurance under harsh conditions. Regulations have been made regarding o-ring packaging and labeling, expiration dating and quality control. O-rings used in critical applications, such as aerospace or aviation, are examined under UV lights before distribution for any stresses or fractures that might cause sealing failure. These safety precautions exemplify the care and precision that quality products require of manufacturers, which is true of the manufacturers and suppliers of o-rings.

O-Rings Manufacturers
O-Rings Manufacturers
O-Rings Suppliers
O-Rings Manufacturers - Arizona Sealing Devices, Inc.
O-Rings Manufacturers - Allied Metrics Seals & Fasteners, Inc.
O-Rings Suppliers - Arizona Sealing Devices, Inc.
O-Rings Suppliers
O-Rings Manufacturers
O-Rings Manufacturers
O-Rings Suppliers - Global O-Ring and Seal, LLC
O-Rings Manufacturers - Global O-Ring and Seal, LLC.
O-Rings Manufacturers - Arizona Sealing Devices, Inc.

Advantages of O-ring Seals

O-rings are O-shaped seals that are made from elastomeric compounds, for example, natural rubber, plastics or polymer, and sometimes, a combination of polymer and rubber. These mechanical seals are used to prevent leakage of media in and from mechanical parts - where the media could be gas, air, liquid, or chemicals.

O-rings are used to create a strong seal between two joining parts in an application. These rings enhance the life of an application by creating a seal and saving it from leakage. They are flexible, which allows them to take the form of the parts in an application where they are being used. The pressure applied on the seal deforms them; they eventually the take shape of the cavity and fit into it perfectly, creating a vacuum and airtight seal.

The flexibility also allows the seal to handle the imperfections and unevenness on the joining surfaces of the application.

These seals are designed to bear strong resistance and pressure. Sometimes, they can withstand a pressure of 100 bar.

Design Specifications

The design of an O-ring involves its inner diameter, cross-sectional diameter, material hardness, material durability, shape, and size. All these factors can be chosen and customized per the application requirement of the client. Some the most popular synthetic materials used in the production of O-rings are Poly Tetra Fluro Ethylene (PTFE), Silicone, Polyurethane, Neoprene, etc. These compositions can be used from basic to heavy-duty purposes by mixing additives in the key material.

As the name suggests, the main feature of O-rings is its "O" shape. The size of "O" can be chosen according to the size the meeting parts of the application.

Advantages of O-rings

Because of their shape, O-rings have many advantages. They are easy to install and replace. Additionally, they can be used in a variety of applications. Some of the biggest advantages of O-rings are -

Suitable for a wide temperature range: O-rings can be engineered to sustain a broad range of temperatures. While rubber and polymer (and the combination of these two materials) are the most popular material choice, various other materials, such as glass, and metal, also have their specific use in the industrial applications. Glass and metal O-rings can are considered suitable for applications that attain extreme temperature during operation.

Better pressure tolerance: O-ring seals display superior pressure tolerance. Presence of flexibility and hardness at the same time gives them this important feature.

Prevent structural damage: With these mechanical seals, there are no chances of critical torque under high pressure. This particular feature ensures that no structural damage happens.

Reusable: O-rings of some materials, such as metal, can be used over and over again in industrial applications. Metal seals are strong and durable; they do not experience wear and tear over time. O-rings of rubber and polymer composition are also reusable.

Given the myriad of applications where O-rings are used, their importance in the advancement of technology cannot be ignored. Unless some radical inventions come along to take their place, they will continue to serve us.

How to Find a Reliable O-ring Manufacturer or Supplier

From industrial machines to household appliances, O-rings play a major role in smooth and dependable operation of a large number of applications. O-rings are an "O" shaped seal that are placed between two surfaces to create a tight seal. The purpose of these seals is to ensure that media does not enter or leak from the joining point.

For a working appliance, it is essential for its parts to be properly connected with each other. Placement of a suitable size O-ring helps ensure this. The O-rings that you are going to use for your application should be able to tolerate the stress or pressure applied by the parts and temperate that the appliance works on. The amount of surface tension and pressure between the joining components should be calculated before getting the O-ring seal designed for your application.

To get O-rings per the specifications of your application, it is important to get these seals from a reliable manufacturer or supplier. The following sections offer a few tips to find a reliable O-ring manufacturer or supplier for your needs -

Use Google: Google is the easiest way to find anything on the Internet. You can find a reliable supplier for your needs by entering the right set of keywords in the search box. The search results will help you reach many businesses that will be ready to meet your requirements.

However, ensuring that the websites or businesses that Google has provided are genuine is a difficult task. How can you be sure that a website that is ranking at first, second, or third position on the search engine result page is actually a reliable business? On the other hand, how will you figure out whether a business that is at the top of the search result can deliver the products at your site in your locality?

Use a Business Directory: Alternatively, you can use a reliable business directory to find an O-ring manufacturer or supplier. You can easily find an online business directory, like, that lists experienced manufacturers and suppliers of industrial machines and parts.

Some directories provide important information about the manufacturer or supplier such as company website, profile, phone numbers, coverage, and products. The best part of using a directory is you can compare the services and prices being offered by many suppliers in just a few minutes. It saves plenty of your time and helps you make a well-informed decision for your needs. Additionally, a business directory never lists a random business. They check the relevance of the business against a specific keyword before putting them in their list.

Whatever method you are going to use to find a reliable O-ring manufacturer or supplier, here are a few tips to initiate the deal -

  • Ask if they can deliver at your site.
  • Tell them your exact requirements, including the pressure and temperature tolerance, size and shape of O-rings. Also, mention the quantity that you need, while requesting for a quote.
  • Convey the time by when you need your order delivered.
  • Check if they have customization option to meet your requirements.

What Are O-Rings and How Do They Work?

O-rings are seals that are used for preventing unwanted leakage of fluids or gases into or from an application. They are one of the most widely used seals, due to their minimal cost and easy to install and easy to maintain features. If made of the right material, these seals can be used for a prolonged period.

Design Specifications:

O-rings have a circle-like design. These rings are usually made from rubber. However, O-rings are also available in assorted shapes, including rectangular and square. Additionally, you can find these seals in various other materials - such as metal, Teflon and, silicone. Different types of rubber and polymer compositions are used for the seals.

Manufacturing Process:

O-rings are manufactured via two processes -compression process and injection molding. In the compression process, the material is compressed between the two sections of the mold. The process is, however, not popular, as it is time-consuming. This process is also only suitable for the production of limited quantity. The injection molding process is the most popular method due to its ability to produce large quantities in comparatively less time. The process involves a tool that has many cavities of the desired size and shape of O-ring seals. Slug is filled into the cavity and then it is allowed to cool down.

The Material:

As mentioned earlier, rubber is the most frequently used material for manufacturing O-rings. Since rubber has low melting point and it cannot sustain heavy temperature, metal and alloy O-rings are also used in some industrial applications. However, the strength and temperature bearing characteristics of rubber can be enhanced by mixing chemicals and other additives into the injection.

Polymer is another material used for the formation of O-rings. However, it is a delicate material. Polymer O-rings are not suitable for heavy-duty applications. They are limited to insignificant and small-size applications, for example, toys. Many variations of polymer are also used for the production of O-rings.

Elastomer is one such variation. The material shows the characteristics of both rubber and plastic. The macromolecules of this material are linked to each other. This composition creates a strong network of molecules in the cross-connection pattern of rubber and polymer materials.

Elastomers also have advanced characteristics that include a wide temperature range and longevity. However, the endurance of the material majorly depends on the type of application. Sometimes, how the application works is also a factor that determines the life of the O-ring seals.

How O-rings Work

Together with creating a strong and airtight sealing, O-rings also generate insulating effect with its elastic deformation feature. It hardens the sealing and keeps the application safe. When the circular cross-section deforms, the seal tends to become elliptical. Because of the twist in the shape of the O-ring, the gap between the two surfaces of the application is filled or closed. This is when insulating effect generates.

For long life, the seals need to be installed correctly between the joining parts. Any miscalculation can result in application damage or the under performance of the application.

O-Rings: Material Selection

O-rings are round, ring-shaped molded rubber sealing devices, which are critical for creating seals between connecting pieces in machines belonging to nearly every industry. Named for their O shape, the function of o-rings are both extremely simple and extremely important. O-rings function similarly to the way gaskets do in connecting valves, tubes, vacuums and hydraulic flow applications, with an impermeable seal between two joints.

Known as the smallest gaskets, o-rings are employed in a wide range of fields for a variety of sealing applications, both static as well as dynamic. These small elastomer loops are one of the most widely used seals for machine design as they are simple to produce, economical, and reliable. Available in a variety of sizes and materials, o-rings can be found in dynamic applications such as hydraulic cylinder pistons and rotating pump shafts as well as in static applications such as water bottle lids and gas caps.

Obviously, the size and type of material will depend on the intended application for the o-ring. The material to be used, for instance, will vary depending on chemical compatibility, sealing pressure, temperature, and lubrication requirements as well as others. The materials to choose from include synthetic rubbers such as butyl rubber, fluoroelastomer, nitril rubber, saniflour, and silicone rubber among others; thermoplastic options include polyurethane, polyamides, melt processible rubber and more. As a practical example, vacuum applications where system is submerged in liquid nitrogen, indium o-rings should be used as rubber would become brittle at such low temperatures.

A majority of materials will fail at extreme temperature, either by becoming brittle and failing to seal in extremely low temperature or burning and decomposing at very high temperatures. However some o-ring materials are suited to withstand temperatures ranging from -200°C and up to 250+ °C.  But even elastomers that can withstand extreme temperatures may not hold up against factors such as ionizing radiation. Usually o-rings are protected from exposure to ultraviolet and soft x-rays, but neutrons could cause very fast decomposition. In cases where penetrating radiation may occur, soft metal seals are usually used. This is why it is so important to understand all aspects of a system before deciding on the best material for the job.

O-Ring Types

  • Clear O-rings  are made of materials that are semi-clear, though not totally transparent in natural form. Certain additives are able to produce ultra-clear silicone. Clear O-rings are generally transparent in both UV light and visible light.
  • Ethylene propylene (EPDM) o-rings are extremely resistant to polar solvents such as alcohols, acetone and MEK. However, EPDM o-rings are not a good choice for applications that involve petroleum oils and greases.
  • Ethylene-acrylate o-rings are commonly used in conjunction with power steering liquids, transmission fluids and engine oils. Compared to polyacrylate o-rings, these have a better low temperature performance but do tend to swell up more.
  • Flat O-rings, also called lathe cut and square rings, are sealing rings with square or rectangle profiles that are used as alternatives to the standard O-ring shape.
  • Fluorosilicone o-rings have excellent heat stability as well as great oil and fuel resistance, but they should not be used in dynamic applications due to their poor mechanical properties.
  • Hydrogenated nitrile (HNBR or HSN) o-rings have similar properties to standard nitrile rubber, but are ozone resistant. Some popular uses include automotive refrigerants and high temperature hydraulics.
  • Kalrez o-rings are made of an advanced material that is being implemented more and more on a daily basis. Kalrez resists over 1,800 different chemicals and is stable in temperatures up to 620 °F; it is also used in aggressive chemical processing, oil and gas recovery and in aerospace and petroleum applications.
  • Large O-rings are the biggest sized O-rings available for sale. Some are offered through sizing charts and mass produced, while others must be custom made to fit certain dimensions.
  • Metal O-rings are round, disc shaped devices used predominantly for sealing applications, though they are also manufactured to suit a variety of alternative industrial purposes. While elastomers continue to be a common choice for o-ring production, metals offer better temperature, pressure and corrosion resistant capabilities.
  • Metric O-rings are o-rings whose measurements are specified in metric units.
  • Neoprene/polychloropene o-rings are made of a material that was the first synthetic rubber. During WWII, it served as the primary seal material, but today it is mostly used in refrigerant applications.
  • Nitrile O-rings are by far the most popular type of seal material used in the world. Nitrile o-rings are carbon triple-bonded to nitrogen, which provides good resistance to oils and fuels.
  • O-ring kits are sets of o-rings that are designed to replace faulty o-rings.
  • O-Ring seals are the air and water tight connections made between two pieces of machinery when an o-ring is compresses between the two components preventing the loss of fluid or gas.
  • Polyacrylate o-rings are extremely resistant to petroleum oils, ozone and oxygen. However, polyacrylate o-rings have relatively poor water resistance and low temperature flexibility.
  • Rubber O-rings are made of rubber and synthetic rubber materials.
  • Silicone O-rings are made of a material that is commonly used in hot air applications as well as devices in the medical field.  The silicon-oxygen structure gives silicone o-rings good thermal stability.
  • Static o-rings are gaskets used in static joints.
  • Teflon O-rings are made from a hard, rigid plastic with high temperature and outdoor element resistance.
  • Viton O-rings are made of a material that is one of the most commonly used for seals. Its popularity can be attributed to its good chemical resistance and extreme upper temperature limit.

O-Ring Terms

Adhere - When materials stick or cling to one another.
Aging - When a material undergoes physical changes over time.
Back-Up Ring - A hard ring that is placed in the gland between the o-ring and the groove walls in order to prevent extrusion.
Batch - The resulting product from a mixing operation.
Cell - A small cavity that is surrounded either completely or partially by walls.
Elastomer - Any of the various materials that are elastic and resemble rubber. Elastomers can be used instead of springs as energizers.
Energizer - A device used in some o-rings that acts to retain the ring's natural shape.  Often, either a spring or an elastomer serve as the energizer at the core of the o-ring.
Friction - The resistance to motion when two or more surfaces rub against one another.
Gland - Cavity into which an o-ring is installed, which also has the groove and mating surface of the second part.
Inside Diameter - The size measured from any inner point of an o-ring to the inner location on the direct opposite side, creating a straight line.
Lubricity - The slippery, lubricated qualities an o-ring material has.
Memory - A material's tendency to resume its original shape after deformation.
Mil-Spec - O-rings that meet and/or surpass standards of the United States military.
- When a mold is misaligned and causes an out-of-round cross section of an o-ring.
Outside Diameter - The size measured from an outside point of an o-ring to that same point on the direct opposite side, creating a straight line.
Overflow Groove - A groove around the mold cavity of an o-ring that is used to accept excess material from the cavity in order to create a better fit.
Parting Line - A line outside of o-rings that is left-over from when the two mold plates met.
Polyurethane - Any of various resins that vary in flexibility and are used in chemical resistant coatings, foams and adhesives.
Squeeze - Cross-section compression of an o-ring gland assembly that shows between the surface of the groove bottom and surface of the mating metal part.
Vulcanized - Improved strength, lubricity and resiliency by combining sulfur and/or other additives with both heat and pressure.
Water Swell - The bulging or increased size of an o-ring due to water intake.

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