W.Maass Nederland is part of the Maass Flange Group, one of the largest flange manufacturers in the world with production facilities in Germany, the United Kingdom, Mexico, India and the Netherlands.

W.Maass Nederland was founded in 1978.

Today W. Maass Nederland is the number one stockholder of Stainless-, Duplex-, Chrome Moly flanges and fittings in the world.


Our inventory consists of a complete range of products. We can supply complete packages of branch, butt weld, screwed, socket welding fittings and flanges.

W.Maass Nederland is located approximately 5 kilometer from Rotterdam sea- and airport and close to major highway connections.

The total surface of our premises is 20.000 m2. Our warehouses cover an area of 15.000m2.

The volume of our stock is more than 40.000 tons divided over more than 10.000 products. 


We have in-house testing facilities and a fully equipped machine shop, which enables us to provide a full range of services to our customers and optimize our flexibility.

W. Maass Nederland can depend on a policy which ensures a skilled, well trained workforce, state of the art equipment and software.

W. Maass Nederland has more than 30 years experience in handling turn key projects and emergency supplies for shut downs of international operating companies.

Since 1988, our company is ISO 9001 certified.

Quality assurance has always been our motto, not just an empty shell.