Find the right O-ring size faster.
Search by AS568 dash number or measured dimensions. The site is designed around identification and reference: size → standard → related sizes.
Find the closest AS568 size
Enter nominal inside diameter and cross-section. The finder ranks the closest standard dimensions without claiming material or application compatibility.
349 AS568 sizes
Browse the six main-table dash-number groups from 001–003 through 425–475.
Browse chartMeasure & identify
Learn how to measure ID, OD and cross-section and why nominal size is not the same as a replacement recommendation.
Measurement guideDimension calculator
Calculate the missing ID, OD or cross-section directly in your browser.
Open calculatorAS568 Cross Reference
Compare metric or inch dimensions with the closest AS568 dash number.
Open cross referenceFind by dimensions
Enter ID and cross-section measurements to rank the closest AS568 sizes.
Open size selectorGroove design check
Select an AS568 size and check preliminary squeeze, simplified fill and installation stretch from your groove dimensions.
Open groove toolAS568 cross-section families
This site covers the 349-size main table. The separate 900-series boss-gasket sizes and metric/JIS standards are outside this dataset.