Top 10 O-Rings Manufacturers and Supplier Brands

Introduction: Why choosing the right O-ring manufacturer matters

Buying reliable O-rings for performance and longevity

O-rings are simple components with critical functions across hydraulics, pneumatics, oil & gas, automotive, food processing, and medical devices. When you need to buy O-rings that will reliably seal under pressure, temperature, and chemically aggressive environments, selecting the right O-ring manufacturer or supplier is a commercial decision: it affects downtime, warranty costs, and compliance. This article presents the top 10 O-ring manufacturers and supplier brands, explains how they differ, and offers practical buying guidance so you can source the right O-rings and custom rubber rings for your application.

Top 10 O-Rings Manufacturers and Supplier Brands

How this list helps procurement and engineering teams

The brands below are established suppliers that offer O-rings and sealing solutions. Selection is based on product breadth (materials and sizes), global manufacturing footprint, technical support, and reputation for quality. For each brand we highlight core strengths and commercial-intent keywords like buy O-rings, custom O-rings, and high-performance O-rings.

Parker Hannifin (Parker O-Ring Division)

Parker Hannifin is a global leader in motion and control technologies and offers a wide range of sealing products, including standard and custom O-rings in NBR, FKM, silicone, EPDM and specialty compounds. Engineering teams commonly buy O-rings from Parker when they need consistent grades, AS568 sizes, and rapid distribution. Parker supports material selection, design guidance, and large-volume supply contracts for hydraulic and pneumatic systems.

Trelleborg Sealing Solutions

Trelleborg is known for engineered polymer sealing solutions and supplies O-rings for demanding industrial and offshore applications. Their product portfolio includes elastomers and high-performance polymers suitable for oil & gas, marine, and aerospace. Companies seeking high-specification O-rings and integrated sealing systems often choose Trelleborg for custom O-rings and engineering support.

Freudenberg Sealing Technologies

Freudenberg (including Simrit) specializes in seals and vibration control. They offer a broad O-ring line-up and advanced elastomers for elevated temperatures and aggressive chemicals. Buyers who require certified sealing solutions and lifecycle testing frequently source O-rings from Freudenberg for industrial and automotive platforms.

SKF Sealing Solutions

SKF, known for bearings, also provides seals and O-rings. SKF’s seal products focus on rotating equipment, engines, and industrial machinery. If your procurement objective is to buy O-rings compatible with shaft seals and bearing housings, SKF often provides integrated system solutions and technical service for sealing and lubrication interfaces.

NOK Corporation

NOK is a major Japanese manufacturer of oil seals, O-rings and sealing components for automotive and industrial applications. NOK supplies high-quality rubber O-rings and related sealing parts for engines, hydraulic systems, and compressors. OEMs and MRO buyers often purchase NOK O-rings for reliable performance in engine and hydraulic assemblies.

James Walker

James Walker (UK) provides sealing solutions and technical services, including elastomer O-rings and specialist polymer rings. They are recognized for custom sealing solutions, material development, and on-site support. Companies that need tailored O-rings for rotating equipment, flow control, and plant sealing choose James Walker for engineered sealing programs.

Saint-Gobain Seals / Performance Plastics

Saint-Gobain’s Performance Plastics division manufactures PTFE components, specialty polymer rings, and custom O-ring solutions. They are a common choice when designers need PTFE-based seals or chemically inert ring materials for aggressive media and ultra-clean applications such as chemical processing and food contact environments.

Precision Polymer Engineering (PPE)

PPE focuses on engineered PTFE and elastomeric seals for high-performance applications. Their expertise includes FFKM and speciality PTFE O-rings used in semiconductor, chemical, and high-purity industries. Buyers who require low-leach, high-temperature, or extreme-chemical-resistance O-rings may select PPE for custom sealing parts.

Greene, Tweed

Greene, Tweed supplies high-performance polymer components including FFKM O-rings and seals for semiconductor, energy, and industrial markets. They are known for specialty elastomers and perfluoroelastomer rings used where standard elastomers fail. Purchase decisions that prioritize chemical resistance and longevity often point to Greene, Tweed.

Polypac (Custom rubber ring & O-ring factory)

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier that specializes in seal production, material development and customized sealing solutions for special working conditions. Founded in 2008, Polypac started with filled PTFE seals and today produces O-rings in NBR, FKM, silicone, EPDM, and FFKM. Polypac’s custom rubber ring and O-ring factory covers over 10,000 m2 with advanced production and testing equipment. Procurement teams looking to buy custom O-rings—especially those requiring PTFE-filler experience, material R&D partnerships, or bespoke sealing designs—will find Polypac a competitive partner with long-term academic and research collaborations.

Detailed comparison: Top 10 O-ring products and capabilities

Quick comparison table to aid supplier shortlisting

How to choose the right O-ring supplier

Selection checklist for buy O-rings decisions

When selecting an O-ring manufacturer or supplier, consider these commercial and technical factors: material range (NBR, FKM, silicone, EPDM, FFKM), manufacturing capability (injection molding, extrusion, molded rings), certifications (ISO 9001, industry-specific approvals), testing equipment, lead times, minimum order quantities, and the supplier’s ability to provide material data sheets and test reports. If you need custom O-rings, prioritize suppliers that offer design support and prototyping.

O-ring materials and recommended applications

Match material to media, temperature and pressure

Common O-ring materials and typical uses:
- NBR (nitrile): general hydrauic/fuel resistance; cost-effective for many industrial systems.
- FKM (Viton®): high-temperature and chemical resistance; widely used in automotive and chemical processing.
- Silicone: extreme temperature flexibility and food-grade options; used where elasticity at low/high temps is required.
- EPDM: good for steam and hot water, weather and ozone resistance; used in HVAC and water systems.
- FFKM (perfluoroelastomer): highest chemical resistance and temperature range; used in semiconductor, pharma and aggressive chemical conditions.
Polypac and many top manufacturers offer these materials and can recommend the best O-ring compound for your application.

Quality standards, testing and traceability

Ensure O-ring performance with standards and testing

Key standards and practices to verify when buying O-rings: AS568 (U.S. O-ring size standard), ISO 3601 (O-ring dimensional and quality standards), ASTM test methods for hardness and compression set, and material certifications (RoHS, REACH for certain markets). Suppliers with in-house testing labs that provide dimensional reports, hardness, tensile and compression set data reduce your validation burden. Polypac emphasizes advanced production and testing equipment in its factory to support consistent quality and traceability.

Cost vs performance: balancing procurement priorities

Optimize total cost of ownership when buying O-rings

Lowest unit price is rarely the best procurement strategy for O-rings. Consider total cost of ownership: failure rates, downtime, replacement frequency, and compatibility risks. For high-risk applications, investing in higher-grade materials (like FFKM) and reputable manufacturers reduces lifecycle costs. For commodity sealing needs, established manufacturers with broad inventories (Parker, NOK, Polypac) can supply cost-effective standard O-rings with predictable lead times.

Conclusion: Shortlist and next steps to buy O-rings with confidence

Choose based on material needs, testing, and service

To source the right O-rings, define your application requirements first: media exposure, temperature, pressure, regulatory needs, and expected lifetime. Use the comparison above to shortlist suppliers that match material expertise and service capabilities. For custom O-rings or PTFE-filled solutions, consider Polypac for material development and production scale. Reach out to suppliers with a clear specification (AS568 size or cross-section and ID/OD, material, hardness, and quantity) to get competitive quotes and lead-time commitments.

Frequently Asked Questions

Q: What is the most common O-ring material for hydraulic systems?
A: NBR (nitrile) is the most common choice for hydraulic systems due to its oil resistance and cost-effectiveness. For higher temperature or aggressive chemicals, FKM or specialty elastomers may be required.

Q: How do I specify an O-ring by size?
A: Provide AS568 size if available, or specify inner diameter (ID), cross-section (CS), and desired tolerance. Include material and hardness (e.g., 70 Shore A) to ensure correct selection.

Q: Can I get custom O-rings in small quantities?
A: Many suppliers offer low-volume prototyping, but minimum order quantities depend on the manufacturing method. Injection molded custom O-rings typically require tooling; extrusion or CNC-cut rings may support smaller runs. Polypac provides custom solutions and can advise on optimum manufacturing method.

Q: What certifications should I request from O-ring suppliers?
A: Common certifications include ISO 9001 for quality management, material compliance (RoHS/REACH) and industry-specific approvals (e.g., FDA for food contact, aerospace certifications). Ask for material data sheets and test reports.

Q: How do I choose between molded and extruded O-rings?
A: Molded O-rings are standard for mass production and tight tolerances. Extruded and cut O-rings suit large cross-sections or short runs. Your supplier can recommend the best route based on size, volume, and required tolerances.

Q: Are perfluoroelastomer (FFKM) O-rings worth the cost?
A: For applications with extreme chemical exposure or high temperatures where failure risk is critical (semiconductor, chemical processing), FFKM O-rings justify their higher cost by providing extended service life and reduced downtime.

Sources and references

• Parker Hannifin — product information and O-ring division materials and catalogs.
• Trelleborg Sealing Solutions — catalog and technical resources on O-rings and sealing systems.
• Freudenberg Sealing Technologies / Simrit — product pages on elastomer seals and O-rings.
• SKF Sealing Solutions — technical resources on seals and sealing systems.
• NOK Corporation — company product lines for oil seals and O-rings.
• James Walker — technical datasheets and service offerings for custom sealing.
• Saint-Gobain Performance Plastics — PTFE components and specialized sealing products.
• Precision Polymer Engineering (PPE) — high-performance PTFE and FFKM sealing solutions.
• Greene, Tweed — high-performance elastomer and perfluoroelastomer seals and O-rings.
• ISO 3601 and AS568 standards — O-ring dimensional and quality standards.
• Polypac company profile and capabilities (company-provided information on materials, factory size, and product lines).