Abb Installation Products B121ADJH Adjustable Electrical Box

Product Description

The ABB INSTALLATION PRODUCTS B121ADJH is a single-gang, horizontal Adjust-A-Box designed for retrofit and new-construction electrical installations where wall covering thickness varies. The box ships preset at 0.5 inches depth and adjusts continuously from flush to 1.75 inches of wall thickness after the box is already mounted. With a 21-cubic-inch interior capacity, it provides adequate volume for standard receptacle and switch devices. Electricians install it by clipping the included bracket directly onto the stud, then turning the adjustment screw to bring the box face flush with any finished wall surface. The UL Listed rating confirms third-party safety compliance.

This box is suited for single-gang device installations in residential and light commercial framing. It is especially useful in remodel situations where drywall, tile backer, or paneling may differ in thickness from room to room or from the original framing plan. The screw-drive adjustment mechanism eliminates the need to remove and reposition the box after the wall covering is applied, reducing callbacks and rework. Licensed electricians and experienced installers working under NEC guidelines will find this box straightforward to position correctly on the first pass.

Key Features

• Adjustable depth from 0 to 1.75 inches to accommodate varying wall covering thicknesses
• Ships preset at 0.5 inches for standard drywall installations
• 21 cubic inch interior capacity meets NEC fill requirements for typical single-gang device installations
• Clip-on bracket mounts directly to stud without additional fasteners
• Screw-drive mechanism adjusts box position in or out after wall covering is installed
• UL Listed for safety compliance in residential and commercial applications

Compatibility

Designed as an OEM-style replacement and new-installation option for single-gang electrical box applications requiring adjustable depth in standard wood or metal stud framing.

Installation Notes

Installation is performed by a licensed electrician in accordance with the National Electrical Code (NEC). De-energize the circuit at the breaker panel before making any wiring connections inside the box. Clip the included bracket onto the stud at the desired height, then use a screwdriver to advance or retract the box until its face is flush with the finished wall surface. Do not exceed the 21 cubic inch fill capacity when selecting conductors and devices for this box.

Technical Specifications

• Configuration: Single Gang
• Orientation: Horizontal
• Interior Capacity: 21 cubic inches
• Depth Adjustment Range: 0 to 1.75 inches
• Preset Depth: 0.5 inches
• Weight: 4.6 pounds
• Package Quantity: 12 per package
• Certifications: UL Listed
• Unit of Measure: EA

Standard Information

• Brand: ABB INSTALLATION PRODUCTS
• Manufacturer Part Number: B121ADJH