Diamond Door – an ASSA ABLOY company began manufacturing dry freight roll up doors for the transportation industry in Upper Sandusky, Ohio in 1991. In January 1996, Diamond was acquired by AM Group which introduced aluminum shutter door products to Diamond’s current line of products.

In January 2005, AM Group acquired Dover Roller Shutters Ltd in England. Dover was the original manufacturer of aluminum roll up doors both in England and United States for the fire and emergency vehicle industry. Diamond, under the Dover Roller Shutters brand name, currently supplies aluminum shutters from its own product lines as well as the original N30 door supplied from England. All manufacturing is conducted in Upper Sandusky, Ohio.

The combination of the dry freight doors (panel overhead doors) and aluminum shutter doors (coiling doors) makes Diamond a one stop shop for any of your vehicle roll up door needs. Diamond also has the ability to design and 3D model the best solution to for your application.

Over the past several years, Diamond has expanded out into other markets with its aluminum shutter products. Today Diamond supplies doors to the work truck market, fire and rescue market, architectural market, point of purchase displays/kiosks market, tool box/pit cart market, and the list goes on. Shutter/coiling door use is fairly new to the United States but is becoming more widely used once the advantages of safety, ease of installation, reliability, and overall cost reduction are being realized.

In 2020, Diamond was acquired by the industrial door division of ASSA ABLOY Entrance Systems, the global leader in access solutions. ASSA ABLOY Entrance systems offers world class products and service ranging from vertical lifting fabric doors to foodservice delivery doors. For more information visit ASSA ABLOY’s website.

Please contact us via phone or email and we will help with the design and installation process. You will talk to a real person and will not get the phone run around. Diamond maintains a 10 business lead time and makes every attempt to meet your schedule if tighter than 10 days. You will also be very pleased with the customer service response you will receive.