AS568 O Ring Standard

The AS568 O-Ring Standard is the most widely used inch-size O-ring classification in the United States. Developed by the Society of Automotive Engineers (SAE), this system categorizes O-rings based on precise Inner Diameter (ID), Outer Diameter (OD), and Cross-Section (CS) dimensions. AS568 standard sizes ensure interchangeability, consistent quality, and universal compatibility across industrial, automotive, hydraulic, aerospace, and general engineering applications.

AS568 O-rings are designed with controlled tolerances to meet demanding sealing requirements. Their uniformity ensures perfect fit in standardized grooves, allowing for leak-proof sealing in static and dynamic applications. Each AS568 size is assigned a unique dash number (e.g., -001, -210, -325), covering cross-sections from 0.040 in to 0.275 in.

The standard is widely adopted worldwide due to its reliability, clear structure, and compatibility with international sealing systems.

Standardized Dimensions (Dash Sizes)

Each O-ring size follows SAE AS568A/B/C specifications, ensuring precision fit and easy part identification.

Reliable Compression & Elasticity

Ensures consistent sealing under compression and maintains resilience for long-term performance.

Wide Material Options

Available in multiple compounds depending on application:

• NBR – Oil, fuel, and hydraulic fluid resistance
• EPDM – Hot water, steam, and weather resistance
• Viton® / FKM – High chemical and high-temperature resistance
• Silicone – Excellent low-temperature flexibility
• HNBR – High mechanical strength and oxidation resistance

Leak-Proof Sealing

Ensures stable sealing performance for:

• Water & liquids
• Oil & lubricants
• Air & gases
• Chemicals (material-dependent)

Global Compatibility

Matches AS568 gland dimensions and ANSI sealing requirements, making it universal for US equipment.

AS568 Dash Size Ranges

• 000 Series: Miniature sizes (micro-sealing)
• 100 Series: Small ID, standard CS
• 200 Series: Medium ID, standard CS
• 300 Series: Large ID, standard CS
• 400 Series: Large CS (0.275")

Available Hardness

• 40–90 Shore A depending on material

Common Temperature Ranges

• NBR: -40°C to +120°C
• EPDM: -50°C to +150°C
• Silicone: -60°C to +230°C
• Viton® FKM: -20°C to +250°C

Industrial Equipment

• Pumps & valves
• Hydraulic systems
• Pneumatic components

Automotive Systems

• Fuel delivery
• AC compressors
• Engine sealing

Aerospace & Defense

• High-precision sealing assemblies
• Hydraulic actuators

Water Treatment & Filtration

• RO systems
• Household water filters

General Machinery

• Compressors
• Air tools
• Laboratory instruments

AS568 O-rings offer the most universal solution for inch-size sealing requirements.

Inside Packaging

• Small poly bag packaging
• Bulk reinforced PE bags
• Tube / reel packaging (optional)
• Vacuum or gas-filled packaging for sensitive materials

Labeling & Documentation

• Dash size, material, quantity
• Lot number for full traceability
• Material report & inspection documents

Outer Packaging

• Reinforced export cartons with custom branding

• 

Customization Options

• Special hardness
• Non-standard colors
• Food-grade / medical-grade compounds
• High-temperature formulations
• OEM print, bag, and carton design

Our engineers can support selecting the right AS568 size and optimal material for your sealing requirements.

Quality & Service Strengths

ISO9001-certified factory

High-precision mold production

Full AS568 dash size catalog

Competitive mass-production pricing

Fast delivery and technical support

AS568 O-rings provide a dependable and globally recognized sealing solution-ideal for industries requiring accuracy, durability, and consistent performance.

📞 Contact Us:
• Website: www.bestseal.com
• WhatsApp / WeChat: +86 189 5015 9396
• Email: yunying2@bestsealhk.com
• Address: Unit 522-525, No.6 Gaodian Road, Huli District, Xiamen, China
 

Why choose us?

• Our Solid O-ring products are designed to withstand harsh environments and extreme temperatures.
• We will persist in building and actively create high-quality, stable, safe and reliable products and services.
• Our Solid O-ring products are designed to provide maximum sealing efficiency in industrial settings.
• We hope to take a brand-new management model, perfect technology, considerate service, and high-quality quality as the basis for survival and development.
• Our focus is on producing Solid O-ring products that are efficient and cost-effective.
• We have a complete monitoring system to ensure that every As568 O Ring Standard manufactured is excellent in terms of performance, appearance and quality.
• We have established a reputation as a leading Solid O-ring manufacturer in the industry.
• We establish a culture of continuous improvement, where all employees actively participate in daily work and work together to make good use of resources and improve productivity.
• Our Solid O-ring products are made from materials that are resistant to rust and corrosion.
• In the production and operation activities of the enterprise, we always insist on safety development as the eternal theme of the enterprise.

Hot Tags: AS568 O Ring Standard, China AS568 O Ring Standard suppliers, manufacturers, factory