Decoding the AS568 O-ring Size Chart: Your Practical Reference for Seal Success

Late one afternoon, a technician was tasked with replacing a sealing component in a critical hydraulic system. The old O-ring was worn out, and finding an exact match demanded quick access to an accurate size reference. Without the right size, assembly delays or potential leaks could occur. This scenario highlights the importance of understanding the AS568 O-ring size chart—a key resource in ensuring proper fit and reliable sealing.

What Is the AS568 O-ring Size Chart?

The AS568 O-ring size chart is a standardized sizing guide recognized internationally, particularly within the aerospace, automotive, and industrial sectors. It categorizes O-rings based on a set of designated sizes, simplifying the selection process for engineers and technicians alike.

This chart organizes O-rings by their inner diameter (ID) and cross-sectional thickness (CS). It helps confirm whether an O-ring will properly fit a groove or sealing surface without requiring complex calculations or measurements.

Understanding the Size System

The AS568 sizing system combines a four or five-digit number to designate each O-ring size. For example, AS568-214 indicates a specific size with standard dimensions. Here are key points to understand:

– **Numerical Designations:** Each number corresponds to a unique combination of inside diameter and cross-section.
– **Standard Dimensions:** The chart specifies precise measurements in inches, aiding in quick cross-referencing.
– **Common Sizes:** Some sizes are more prevalent in pneumatic and hydraulic applications.

### Typical AS568 Sizes (select examples):

– AS568-005: 1.719″ ID, 0.139″ CS
– AS568-214: 2.500″ ID, 0.139″ CS
– AS568-015: 0.275″ ID, 0.139″ CS

Choosing the correct size ensures sealing integrity and avoids over-compression or leaks.

Why Accurate Size Selection Matters

Incorrect sizing may lead to insufficient compression, resulting in leaks, or excessive compression, which causes material fatigue. Both scenarios jeopardize system safety and longevity. When in doubt, always double-check measurements against the size chart.

To streamline the process, maintain a reference of common sizes and keep a set of calipers handy for verifying measurements. Using a comprehensive size chart like the AS568 O-ring size chart reduces guesswork and ensures compatibility.

In summary, familiarity with the AS568 size chart is essential for maintenance, design, and procurement of reliable sealing solutions. It turns a potentially complex task into a straightforward process—saving time, money, and headaches.