This blog post shares DIN 3771 o-ring sizes. 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
11. Standardisation - O-Rings-Stock O-Ring Webshop
4. Size List - O-Rings-Stock O-Ring Webshop
O-ring 41.2x3.55 - NBR - Nitrile - 90 Shore A - Black - ORS137700
O-ring DIN 3771
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O-ring standard DIN 3771