GMN: Experience for more than 90 years GMN is a rich in tradition, family owned company located in Nürnberg. Whose superior quality products are in demand worldwide. We produce our high precision ball bearings, machine spindles, sprag type freewheel clutches and non-contact seals for a wide scope. Most of our products are made for special applications on customer requests. A worldwide net of sales and service stations support all demands of our customers.