DIN 3771 Metric O-Rings Size Chart

The DIN 3771 o-ring standard is issued by The German Institute for Standards (Duetsches Institut für Normung). This standard identifies O-Ring sizes by the ID x C/S, and may be followed by a letter indicating the quality level (N – normal quality; S – special quality), and a code indicating the rubber polymer and IRHD hardness.

For a complete listing of all metric o-ring sizes, visit our Metric O-Ring Cross Reference Table.


DIN 3771 Size Chart

Global Part # Reference C/S (MM) I.D. (MM) C/S (Inch) I.D. (Inch)