Bright Indotech Private Limited

The O-Rings are available in standard metric sizes (cross sections are in 0.5 millimeter and inside diameters are in 1 millimeter increments) and in standard inch sizes. The inche sizes is the Aerospace Standard 568 published by the Society of Automotive Engineers.  The inch sizes are designated by dash number as shown on the size chart AS568 or AS568A. AS568 or AS 568 was used to be called ARP568. For instance, an O-Rings with an inside diameter of (I.D.) of .239+.005 and a cross section (w) of .070 + .003 is designated as AS568 - 010   or  - 010. 

 The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound.  70-durometer hardness should be used whenever possible as it offers the best combination of properties for most O-Rings applications.