Abb Installation Products B121ADJ Single Gang Adjustable Box

Product Description

The ABB INSTALLATION PRODUCTS B121ADJ is a single-gang adjustable electrical box designed to simplify rough-in installations in walls of varying thickness. The box arrives preset at 0.5 inches and adjusts in or out by turning a single screw, allowing the installer to bring the face flush with any wall covering without cutting or shimming. It carries a 21 cubic inch capacity, which accommodates standard device wiring loads. The patented bracket clips directly onto a stud, and the included mounting clip keeps the assembly secure throughout the adjustment process. UL Listed for safety compliance. Licensed electricians and skilled tradespeople typically install this box during new construction or remodel work.

This adjustable box is well suited for residential and light commercial rough-in applications where finished wall thickness is not known at the time of box installation. Common scenarios include drywall installations where thickness varies between 0.375 inches and thicker fire-rated assemblies. The preset depth and tool-driven adjustment eliminate the need to stock multiple fixed-depth boxes for a single job, reducing material waste and install time on multi-room projects.

Key Features

• Adjustable depth via single screw — no additional tools needed to set flush position
• Preset at 0.5 inches from the factory for standard drywall rough-in
• 21 cubic inch capacity supports standard single-gang device wiring
• Included bracket clips onto any stud for fast, stable mounting
• Patented design accommodates varying wall covering thicknesses
• UL Listed

Compatibility

Designed as an OEM-style replacement and new-construction single-gang adjustable electrical box for use with standard single-gang devices in residential and light commercial wall assemblies.

Installation Notes

Installation is performed by a licensed electrician in accordance with applicable NEC requirements. Power to the circuit must be off and confirmed de-energized before any wiring connections are made. Clip the bracket onto the stud, set box depth by turning the adjustment screw until the face is flush with the intended wall surface, then secure wiring per code. Do not exceed the 21 cubic inch fill capacity as calculated per NEC box fill rules.

Technical Specifications

• Box Capacity: 21 cubic inches
• Preset Depth: 0.5 inches
• Package Quantity: 24 per box
• Weight: 10.05 pounds
• Certifications: UL Listed

Standard Information

• Brand: ABB INSTALLATION PRODUCTS
• Manufacturer Part Number: B121ADJ