Don-jo DB478M Black Dust Box Asa Mortise Strike

Product Description

The DON-JO DB478M is a black plastic dust box designed to fit 4.875-inch ASA mortise strikes on standard door frames. Dust boxes protect the mortise strike pocket from debris, paint overspray, and foreign material when the door is unlatched or the latch bolt is retracted. This component is installed by locksmiths, door hardware technicians, and finish carpenters during new construction or retrofit work. The black finish is low-maintenance and resists common smudging, requiring only a wipe-down for cleaning. Manufactured in the USA, the DB478M is a single-unit accessory sized specifically for the 4.875-inch ASA mortise strike standard.

The DB478M is suited for interior and exterior door applications where an ASA mortise strike is installed. Typical use cases include commercial and residential entry doors, office doors, and hollow-metal or wood door frames that receive a standard 4.875-inch mortise strike. The part ships as a single unit and is intended as a direct accessory to the mortise strike installation rather than a standalone door hardware component.

Key Features

• Fits 4.875-inch ASA mortise strikes for a precise, rattle-free fit
• Black plastic construction resists corrosion and is lightweight
• Low-maintenance finish wipes clean without special products
• Non-hazardous material - safe to handle and dispose of per standard jobsite practices
• Made in the USA

Compatibility

Designed for use with 4.875-inch ASA mortise strikes on standard residential and commercial door frames.

Installation Notes

The DB478M is installed by locksmiths or door hardware technicians as part of a mortise strike rough-in or replacement. Before installing, confirm the door frame pocket dimensions match the 4.875-inch ASA mortise strike standard. No special tools are required beyond standard hand tools used in door hardware installation. Ensure the latch mechanism is fully disengaged and the door is secured before seating the dust box into the strike pocket.