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O Rings
Introduction

O-rings and other toroidal seals find their way into a vast array of markets and product applications. Worldwide, there are numerous specifications and standards pertaining to Basic Rings. The information in this chapter includes the most widely used specifications and standards set to help designers and manufacturers select or begin their search or custom design of the proper seal for their application.

Dimensional Standards and Sizes
Universal Size Table, ISO3601-1, AS 568B, AS 568B (Boss), BS1806, BS-4518, French NF T 47-501, JIS B 2401, DIN 3771

Gland & Groove Dimensions and Sizes
Universal Size Table, ISO 3601-2, AS 568B, DIN 3771, JIS 2406, Military Standards

Calculating Design Specifications
Formulas and interactive calculators to assist in basic ring selection and gland/groove design.
Dimensional Standards

Over the last several years, there has been a concerted effort worldwide to consolidate Basic Ring specifications into a single, worldwide standard. The result is the International Standards Organization (ISO), which has been the driving force in this consolidation effort. While Yaseki still recognizes and manufactures to existing standards, our dimensional, material, and quality mindset follow the guidelines set forth by ISO.

Specification Index
ISO 3601-1 International standard for metric and inch series O-rings. The second edition includes the requirements for Aerospace (AS) applications.
SAE AS568B American standard for O-rings. AS-568 is the Aerospace Standard (AS) as well as the SAE standard and is used for military and industrial manufacturing in North America.
BS 1806 British standard for inch series O-rings. This standard is derived from SAE AS-568B.
BS 4518 British standard for metric series O-rings. BS 4518 incorporates European practices used for sealing components against fluids under dynamic and static conditions.
JIS B2401 Japanese industrial standard for metric series O-rings. This standard now includes the second edition of ISO 3601-1.
DIN 3771 German metric standard for fluid-sealing O-rings.
NF T47-501 French standard for O-rings. This standard is similar to the ISO 3601 and the DIN 3771 standards with some unique class designations.
 
Gland & Groove Standards

Specification Index
ISO 3601-2 International standard for metric and inch series O-rings gland and groove specification. This standard is not yet avialable from ISO.
SAE AS568B American standard for O-ring Gland & Groove specifications. AS-568 is the Aerospace Standard (AS) as well as the SAE standard and is used for military and industrial manufacturing in North America.
DIN 3771 German metric standard for fluid-sealing O-ring Gland & Groove specifications.
JIS B2406 Japanese industrial standard for metric series O-ring housings.
Military Standards
MIL-G-5514 Gland Dimensions
MS33649 Boss End Dimensions
MS33656 Boss Fitting End Dimensions
 
 
 
 
 
 
 

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