O-ring size charts for U.S. and metric o-ring sizes. Find the right size o-rings, quad-rings, x-rings and square-rings for your application. Custom and non-standard o-ring sizes available with no tooling or setup fees.

Use our o-ring size chart and calculator to find the AS568 or metric sizing of standard size HNBR, Viton, and other o-rings.

Use our o-ring size chart to find AS568 standard o-ring sizes by cross section, inside diameter, and outside diameter. Then use the o-ring size chart to easily order online from one of the world’s largest o-ring inventory networks.

The metric sizes are further broken down by region, notably Europe and Japan. Learn more about O-Ring sizes using the links below to explore their dimensions in an interactive chart. Seal & Design has all these sizes and more. We can provide virtually any required size.

Refer to our o-ring sizing charts below for the most commonly used sizes around the world. We also offer custom o-rings without tooling fees to ensure a perfect fit.

The standard sizes for o-rings include 20 sizes used to seal straight-thread tube fittings on a boss. A boss is a ± cylindrical projection on a casting or forging. The end of that projection is machined to provide a flat, smooth. 0.30 surface for sealing.

Our O-Ring Size Charts show the common O-Ring size standards most often used/referenced standards by our customers in the US and internationally.

This AS568 O-ring chart is a SAE size standard for O-rings and shows AS568 Rev B or AS568B O-ring sizes which supersedes AS568 Rev A or AS568A O-ring dimensions.

Download the O-Ring Size Chart to view standard sizes (O-rings are measured in millimeters). O-Rings are one of the most common types of seals in the world. With an unlimited number of possible manufacturing sizes, they are used various applications across industries.

The Global O-Ring and Seal Size Reference Chart covers the AS568 O-Ring Sizes published by the Society of Automotive Engineers (S.A.E.), and includes the Extended Sizes in the 400 Series.