The colourful world of fasteners
For over 30 years, EJOT has been producing fastening elements for professional applications in the building industry. The coloured screws and rivets are finished at the in-house powder-coating facility.
Only high-quality, polyester-based, powder-coating materials are used for lacquering. In addition to a high weather resistance, the lacquer also has good mechanical properties, which is of special importance for the screws with hexagon drive, as the edges are exposed to high forces during fastening.
Before the actual painting takes place, the screws are placed on perforated metal sheets. Existing sealing washers are firmly pressed on the screw head. In the next work step the products are sandblasted automatically. This removes residue, and the surface is roughened for a better absorption of the powdered pigment.
The surface of the screw is cleaned and roughened in the fully automatic sandblaster cabin, for a better application of the powdered pigment.
For comparison: On the left side the unfinished screw, on the right side the rough surface after the sandblasting process.
Detail of the powder coating material
Applied powder coating
The work steps from left to right: Unfinished serial screw, sandblasting, powder coating, finished screw with burned-in paint coat.
Last step: EJOT employee Matthias Marburger during the quality control.
Approximately 11 million screws and rivets have been produced for customer orders in 2015. The largest proportion are the so-called FR screws with a flat fillister head for facade applications. The most popular colour was RAL 7016 - anthracite grey. All available RAL colours are offered.