Standard As568 Usa O Ring Sizing Chart

1. Product Overview

The AS568 O-ring standard, established by the Society of Automotive Engineers (SAE), defines the most widely recognized sizing system for O-rings used in the United States. Designed to ensure precise dimensions, compatibility, and interchangeability, AS568 O-rings are used in aerospace, automotive, industrial machinery, hydraulics, pneumatics, water systems, and more. This guide provides a complete technical overview of AS568 size groups, dash numbers, tolerances, material options, and industrial applications.

2. Key Features

2.1 Standardized Dash Number System

The AS568 sizing chart uses a three-digit "dash number" (e.g., -012, -214, -325) to identify each dimension. Every dash number corresponds to a fixed inside diameter (ID) and cross-section (CS), ensuring full compatibility across all manufacturers worldwide.

2.2 Five Standard Size Series

AS568 organizes O-ring sizes into five series based on cross-section thickness:

• 000 Series: 1.78 mm (0.070")
• 100 Series: 2.62 mm (0.103")
• 200 Series: 3.53 mm (0.139")
• 300 Series: 5.33 mm (0.210")
• 400 Series: 6.99 mm (0.275")
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2.3 Precision Tolerances

All AS568 O-rings follow strict dimensional tolerances to guarantee sealing reliability. Cross-section tolerances range from ±0.08 mm to ±0.15 mm depending on series, while inside diameter tolerances range from ±0.10 to ±0.25 mm.

2.4 Full Range of Standard & Custom Sizes

All AS568 standard O-ring sizes are available directly from inventory. Custom metric sizes, PTFE-coated versions, and OEM designs are also supported for specialized applications.    

3. AS568 Size Series & Dash Numbers

000 Series – 1.78 mm (0.070") Cross-Section

• -001 → ID 0.74 mm
• -002 → ID 0.97 mm
• -003 → ID 1.27 mm

100 Series – 2.62 mm (0.103") Cross-Section

• -110 → ID 13.95 mm
• -112 → ID 15.54 mm
• -116 → ID 20.29 mm

200 Series – 3.53 mm (0.139") Cross-Section

• -214 → ID 20.29 mm
• -222 → ID 28.27 mm
• -232 → ID 44.14 mm

300 Series – 5.33 mm (0.210") Cross-Section

• -325 → ID 36.20 mm
• -332 → ID 53.62 mm

400 Series – 6.99 mm (0.275") Cross-Section

• -425 → ID 50.47 mm
• -436 → ID 69.50 mm

4. Material Options

NBR (Nitrile Rubber)

Excellent oil resistance and widely used for automotive, hydraulic, and general industrial sealing.

EPDM

Outstanding resistance to water, steam, weather, and chemicals. Suitable for drinking-water and outdoor systems.

Silicone (VMQ)

Heat-resistant, food-grade compatible, and flexible at low temperatures.

FKM (Viton®)

Superior high-temperature and chemical resistance for severe industrial environments.

5. Applications

Hydraulic & Pneumatic Systems

Cylinders, pumps, compressors, valves, actuators.

Automotive & Transportation

Fuel systems, air-conditioning compressors, engines, injectors.

Water Treatment & Plumbing

Filter housings, faucets, connectors, pressure systems.

Aerospace & Industrial Machinery

Instrumentation, fittings, control valves, high-performance sealing.

6. Packaging & Shipping

Inside Packaging

• Small Bag Packaging – separated by dash number and material
• Large Bag Packaging – bulk supply for industrial customers
• Vacuum Packaging – ideal for long-term storage
• Customized Labeling – material, size, batch, and certification indicated

Outer Packaging

Durable cartons with shock-absorbing materials to ensure secure delivery.

7. Why Choose Us for AS568 Standard O-Rings?

• Full Material & Quality Certification

ISO 9001, CE, UL, FDA, NSF, WRAS, RoHS, REACH, SGS compliant.

• Large Inventory – Same Day Shipping

All AS568 dash numbers in stock with over 10,000 molds available.

• Advanced Manufacturing Capability

36 production lines, 120+ advanced machines, and precise molding control.

• OEM / ODM Support

Custom materials, colors, packaging, branding, and special-size development.

8. Contact Us

Xiamen Best Seal Imp. & Exp. Co., Ltd

Tel: +86-592-5782315

Mob: +86-18950159396

Email: yunying2@bestsealhk.com

Add: Unit 522-525, No.6 Gaodian Road, Huli District, Xiamen, China

Why choose us?

• We keep up with the latest industry developments to ensure our Solid O-ring products are up to date and effective.
• With our strict focus on the quality of our Standard As568 Usa O Ring Sizing Chart, as well as the service image and continuous innovation, our brand enjoys a good reputation.
• We are committed to providing our customers with reliable and cost-effective Solid O-ring solutions.
• We focus on cultivating employee loyalty and personal development.
• Our Solid O-ring products are subject to rigorous testing to ensure optimal performance.
• To implement the famous brand strategy, we realize the quality standardization and scale production of our Standard As568 Usa O Ring Sizing Chart.
• We offer a comprehensive range of Solid O-ring products to meet various industrial requirements.
• Our internal leadership group focuses on the improvement of various systems and the establishment of corporate culture, and carries out various trainings.
• We have a skilled team of professionals who offer excellent customer support for our Solid O-ring products.
• The group adheres to the business philosophy of "innovation, quality, and efficiency" and the management philosophy of "people-oriented", and treats people sincerely and trusts as a mountain.

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