A filler plate is a piece of hardware used in a door or door frame. Most door and frame manufacturers create cut-outs in these components at the factory, which make it easier for builders to install hardware once the units are on site. Instead of using special tools to cut out holes for locks and hinges, the installer simply installs these hardware devices in the pre-drilled holes created at the factory. In the event that one of these holes isn't needed, a filler plate can be used to conceal the hole from view and improve the appearance of the door or frame.
Filler plates are used in a variety of applications. They can be used to fill in an incorrectly drilled hole or hinge prep area, whether created in the field or the factory. These plates are also helpful for covering old cut-outs when old hardware is replaced. In some buildings, a filler plate may be used on doors designed for future use. This allows the owner of the building to simply remove the plates and install hardware once he is ready to use that section of the building.
By covering up holes and cut-outs in the door and frame, a filler plate can have a significant impact on the appearance of these units. The plates also block noise from passing through these openings, and improve privacy. When a filler plate is used on an exterior door, it can improve security and protect the interior of the building from moisture and air infiltration.
Each hardware manufacturer typically produces its own line of filler plates, which are designed to fit the cut-outs of that particular line of hardware. Most produce separate filler plates for hinges, closers, and lock openings on the door, as well as plates designed to fit strike and closer cut-outs on the frame. The filler plate may be round or rectangular, depending on the shape and design of the hardware. Most come with screws designed to fit the holes in the plate as well as those in the door or frame.
A filler plate may be made from cold-rolled or galvanized steel. Those used on aluminum doors may also be made from aluminum so that they blend in better with the surrounding surface. Most are available in a number of finishes to match the door or any nearby hardware, though these plates can also be painted to help conceal their appearance.