Contact Us Now
O-Ring Size Charts
O-Ring Size Charts
O-ring size charts provide standard dimensions for selecting the correct O-ring based on inner diameter (ID), outer diameter (OD), and cross section (CS). Below you will find common inch and metric O-ring size standards used worldwide.
Standard O-Ring Size Systems
O-rings are manufactured according to international standards to ensure interchangeability and consistent performance.
- AS568 inch size O-rings (USA standard)
- Metric O-ring sizes (ISO & DIN based)
- ISO 3601 international standard O-rings
- DIN 3771 metric O-rings
AS568 O-Ring Size Chart (Inch Sizes)
The AS568 standard defines inch-sized O-rings commonly used in hydraulic and pneumatic systems in North America.
Metric O-Ring Size Chart
Metric O-rings are measured in millimeters and are widely used in European and international equipment.
View Metric O-Ring Size Chart →
ISO 3601 O-Ring Size Chart
ISO 3601 is an international standard covering dimensions and tolerances for metric O-rings.
DIN 3771 O-Ring Size Chart
DIN 3771 defines commonly used metric O-ring sizes for European industrial applications.
How to Measure an O-Ring
- Measure the inner diameter (ID)
- Measure the cross section (CS)
- Calculate outer diameter (OD = ID + 2 × CS)
Need Help Selecting the Right Size?
If you are unsure about the correct O-ring size, our engineering team can assist you based on drawings, samples, or application requirements.