Mechanical galvanizing is accomplished by combining glass beads, plated chemicals, zinc powder, water and the fasteners in a rotary barrel. Mechanical galvanizing applies up to a 4 mil thick layer of zinc at higher psi than other galvanizing techniques, making it the most suitable for screws and other kinds of fasteners intended for exterior use. While mechanical galvanizing gives a dull finish, meaning it isn’t as aesthetically pleasing as the finish of other galvanizing techniques, it is the best galvanizing solution for smaller items that will be exposed to harsh conditions. Rotary Barrel. The barrel is then spun, causing the plating chemicals, zinc powder and water to combine, while the glass beads hammer the zinc solution onto the fasteners. The
force of the glass beads hammering the solution onto the fasteners has a welding effect and also results in a more uniform zinc plating than hot
dipped galvanizing.