Electrical Metal Box Covers & Steel Wall Plates – Complete Guide
When working with 4" electrical boxes, the right cover is just as important as the wiring itself. Whether you're finishing a commercial installation, upgrading a residential system, or sourcing materials for a large project, metal box covers provide the durability, compliance, and professional finish that electricians rely on every day.
At Wallplate Store, we specialize in U.S.-made steel electrical box covers designed for performance, availability, and code compliance. If your project requires Buy American / ARRA-compliant materials, make us your first choice.
What Are Electrical Box Covers?
Sample of A One Gang Duplex
Receptacle Electric Outlet Steel Cover
Electrical box covers (also called 4" square box covers or raised covers) are designed to mount directly onto electrical boxes and provide openings for switches, receptacles, or specialty devices. You can also use 4" x 4" blank or raised covers when using the metal electric box as a junction box.
Unlike standard wall plates, these covers are typically box-mounted, meaning they attach directly to the electrical box rather than the device. In most exposed work or surface-mounted installations, the wiring device (such as a switch, receptacle, or sensor) is first secured to the metal cover. The entire assembly is then mounted onto the electrical box.
They are commonly used in:
- Commercial and industrial installations
- Surface-mounted conduit systems
- Exposed work applications
- Utility rooms, basements, and mechanical spaces
Why Choose Metal Steel Box Covers?
Superior Strength & Durability
Our covers are manufactured from high-quality steel and built to withstand demanding environments where plastic alternatives fall short.
Code Compliance (NEC Ready)
Covers with duplex openings include additional screw holes and mounting hardware to meet the latest NEC requirements.
Professional Finish
Each cover features precision stamping, tapping, and finishing, ensuring a clean, secure fit every time.
Made in the USA
All of our metal box covers are proudly manufactured in the USA, making them ideal for government, institutional, and ARRA-compliant projects.
Key Features
- Over 20 different openings and configurations
- Fully depressed corners for easier and faster mounting (some configurations also available in flat - blank and device covers)
- Also available in smooth gray powder coat finish for durability and appearance - helps prevent oxidation and rust
- Additional screw holes on duplex openings for NEC compliance
- Special openings and custom combinations available
Available Configurations
We stock a wide range of configurations to meet virtually any job requirement, including:
- Blank covers
- Single and double toggle switch
- Duplex receptacle
-
Single receptacle
- Combination openings (toggle + duplex, GFCI + switch, etc.)
- Round power outlet openings (multiple diameters)
- GFCI / Decora openings
With 20+ configurations available, electricians and contractors can find the exact cover needed without compromising fit or safety.
Sample Available Configurations of
Steel Plate Covers for Metal Boxes
Finish Options: Powder Gray vs. Unfinished (Galvanized)
All catalog numbers are available in two finishes:
Powder Gray Finish (Standard)
- Smooth, durable powder-coated surface
- Resists corrosion and wear
- Clean, professional appearance
Unfinished (Galvanized Steel)
- Indicated by adding a "U" suffix to the part number
- Example: 11423 → powder gray, 11423U → unfinished
- Made from galvanized steel (not raw steel)
- Highly popular for industrial and exposed applications
Note: The unfinished version is not raw steel—it features a galvanized coating for corrosion resistance and is often the preferred choice for contractors.
Common Applications
- Commercial electrical installations
- Industrial facilities and warehouses
- Surface conduit systems (EMT / rigid)
- Utility and mechanical rooms
- Multi-device junction boxes
Why Contractors Choose Wallplate Store
We don’t just sell wall plates—we specialize in supplying electricians and contractors with the products they need, when they need them.
- Large in-stock inventory (even when big-box stores are out)
- Hard-to-find configurations readily available
- Fast turnaround and reliable shipping
- Bulk order support for large projects
- Consistent quality across every order
Many of these configurations are not stocked at Home Depot or Lowe’s, making Wallplate Store a go-to source for professionals who need reliable supply.
Technical Notes
- Some installations may require trimming of device strap “ears” prior to mounting
- With metal covers, wiring devices are first mounted to the cover, then the cover is mounted to the box
- Raised covers are commonly used for surface-mounted electrical systems
- Matching screws are included with all steel covers
With Metal Covers, Wiring Devices Are First Mounted to
The Cover, Then the Cover Is Mounted to the Box
Shop Electrical Box Covers
Browse our full selection of metal electrical box covers and wall plates to find the exact configuration you need for your project.
View All Electrical Box Covers →
Superior Quality • U.S. Made
From standard configurations to specialized applications, our metal box covers deliver the performance, durability, and compliance professionals expect.