Orbit 4SB-MKO-FB 4" Square Welded Steel Box with MKO & FB Bracket

Orbit 4SB-MKO-FB 4" Square Welded Steel Box with MKO & FB Bracket, 1-1/2" Deep

The Orbit 4SB-MKO-FB is a 4-Inch x 4-Inch x 1-1/2-Inch welded square (4S) electrical box constructed from 16 Gauge sheet steel, delivering 21 cubic inches of usable interior volume for wiring devices, receptacles, and junction connections. This box is factory-equipped with an MKO bracket and an FB bracket, giving installers a pre-configured mounting solution for fast, secure placement in new construction and remodel electrical rough-in work. The fully welded seam construction provides a rigid, one-piece box body that resists flexing during installation, while the compact 1-1/2" depth keeps the box profile low for standard wall and stud-cavity applications. Backed by the Orbit name, this 4S box is built to standard electrical box dimensions so it integrates cleanly with common covers, mud rings, and device plates sized for the 4-Inch square footprint.

Key Features

• Box Size: 4-Inch x 4-Inch x 1-1/2-Inch deep square (4S) configuration for standard device and junction installations.
• Durable Construction: Fabricated from 16 Gauge sheet steel for a rigid, impact-resistant box body.
• Welded Seams: Fully welded corner and seam construction for a solid, one-piece box that holds its shape during handling and installation.
• Interior Capacity: 21 cubic inches of usable volume to accommodate devices, splices, and conductors per code fill requirements.
• Integrated Mounting Brackets: Equipped with both MKO and FB brackets for versatile, ready-to-install mounting without sourcing separate hardware.
• Standard 4S Footprint: 4-Inch square dimensions are compatible with common 4-Inch square covers, mud rings, and device plates.

Technical Specifications

• Box Type: 4" Square (4S) Welded Box
• Dimensions: 4-Inch x 4-Inch x 1-1/2-Inch
• Material: 16 Gauge Sheet Steel
• Interior Volume: 21 Cubic Inches
• Mounting Brackets: MKO and FB Brackets Included

Typical Applications

• Residential and Commercial Wall Rough-In
• Receptacle and Switch Device Mounting
• Junction and Splice Point Installations
• New Construction Electrical Framing
• Stud-Mounted Electrical Box Applications

Why Orbit?

Orbit engineers this 4S square box from durable 16 Gauge welded steel, giving electricians a rigid, dependable enclosure that stands up to jobsite handling. With the MKO and FB brackets already integrated, this box streamlines installation for professionals who need a reliable, code-ready electrical box without assembling separate mounting hardware.