ISO 3601, the standard covering O-Rings, the most commonly used seal, was revised to meet American, European, as well as Asian needs. The new standard, ISO 3601-1:2008, consolidates the long established AS 568B inch standard with the existing metric ISO 3601.
The standard specifies the nominal sizes of O-Rings and dimensional tolerances. It has now been confirmed that all standard O-Rings available from Trelleborg Sealing Solutions conform to ISO 3601-1:2008, class B. Tolerance tables according to the new standard are now online.
Revised standard successfully embraces both the AS and ISO tolerances in a single standard
“Discussions to harmonize the two standards have been ongoing for a number of years,” says Bernd Murthum, O-Ring Product Manager for Trelleborg Sealing Solutions. The revised standard not only successfully embraces both the AS and ISO standard tolerances in a single standard but also extend cross sections covered. “ISO 3601 and AS 568B only describe five standard cross sections. In reality, in the marketplace there are many more. Common practice was to use the principles of the ISO over a broader range of cross sections. This is now recognized in the revised standard.”
“One thing the working group ensured was that the ISO designation remained the same,” adds Murthum. “With such a long established standard this was important and means that documentation need not be changed, unless they include the standard’s date.”
Click here to:
Read more about development of the standard
Go to metric O-Ring tolerance table
Go to inch O-Ring tolerance table
Download our O-Ring catalog metric version
Download our O-Ring catalog inch version
Go to members area and use our O-Ring calculator or electronic catalog to find the optimum O-Ring for your application