Premium-Quality since 1867

Uncompromising premium quality: This is what we have offered our clients for 140 years now. Tradition and innovation are a single potent entity at COG and the key to success. This is demonstrated daily in our customer relations. Our clients are among the best in their respective industries. And they expect the best from us.

Over 190 employees are committed at COG to our clients' success, ranging from engineers in the application technology department to our colleagues in Europe's largest O-ring warehouse with their rapid response capabilities. As an independent manufacturer based in Pinneberg near Hamburg, managed by the fifth generation of the founding family, we are a leading supplier of precision O-rings thanks to our comprehensive stock, flexible production facilities and customer service commitment.

• Founded in 1867 in Pinneberg near Hamburg


• Independent family company with more than 190 employees


• Europe's largest O-ring stock (over 45,000 items in stock)


• Tools for over 15,000 different O-ring sizes available


• In-house mixing and mixture development


• Close cooperation with leading raw materials makers


• Releases and approvals granted for many materials and to hand


• Own tool manufacture


• Optimised delivery service from our new logistics centre opened in 2002


• Quality management per DIN EN ISO 9001:2008


• Environmental management per DIN EN ISO 14001:2009

• Hydraulics: O ring
• Hydraulics: Elastomer seals