O-ring size identification
O-Ring Size Selector
Have an O-ring measurement but not the dash number? Enter the nominal dimensions and compare the closest AS568 sizes.
Dimensional identification
Find an AS568 O-Ring from Measurements
Enter nominal O-ring inside diameter and cross-section. Results are ranked by dimensional closeness; this does not certify interchangeability.
How the match works
The selector compares your dimensions against the 349 AS568 main-table sizes. ID and cross-section carry the most weight; optional OD provides an additional check.
What it does not determine
A dimensional match does not establish material compatibility, pressure rating, temperature range, hardness, gland suitability or interchangeability with another standard.
Need groove checks?
Once you identify a size, use the Groove Design Check to calculate preliminary squeeze, fill estimate and installation stretch.