Steel City Square Steel Outlet...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$252.21
$12.09
Steel City MB120ADJ Outlet Boxes

Steel City Square Steel Outlet Box 20 Cubic Inch Capacity with 5 Knockouts

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Model: MB120ADJ
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$252.21
$12.09
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Steel City Square Steel Outlet Box 20 Cubic Inch Capacity with 5 Knockouts

Professional steel construction for reliable electrical installations

Steel City delivers professional-grade electrical solutions with this square steel outlet box featuring 20 cubic inch capacity and 5 knockouts for versatile wiring configurations. The durable steel construction with silver finish provides reliable performance for wall and ceiling mounting applications in residential and commercial installations.

Professional Features & Benefits

  • 20 Cubic Inch Capacity: Provides ample space for wire connections and reduces overcrowding for safer installations
  • 5 Knockouts: Multiple entry points offer flexible conduit and cable routing options for complex wiring configurations
  • Steel Construction: Durable material ensures long-lasting performance and protection in demanding electrical environments
  • Square Shape Design: Standard configuration compatible with most electrical devices and mounting requirements
  • Wall/Ceiling Mounting: Versatile installation options accommodate various project requirements and space constraints
  • Silver Finish: Professional appearance complements standard electrical components and installations

Technical Specifications

  • Color: Silver
  • Cubic Capacity: 20 Cubic Inches
  • Departmetn: Electrical
  • Depth: 89.408mm
  • Knockouts: 5
  • Material: Steel
  • Mounting Method: Wall-/ceiling mounting
  • Number Of Outlet: 1
  • Outer Dimensions Inches : 13x18.5x10.75
  • Outer Quantity: 18
  • Product Details: Outlet Boxes
  • Product Group: Electrical Enclosures
  • Product Length: 83.312mm
  • Product Size: 3.28 Inches Length x 2.2 Inches Width x 3.52 Inches depth
  • Product Subgroup: Boxes
  • Product Type: Steel Outlet Boxes
  • Shape: Square
  • Unspsc: 39121308 Outlet box
  • Weatherproof: N
  • Weight Uom: 1 lbs. Each
  • Width: 55.88mm

Professional Applications

  • Residential electrical installations and renovations
  • Commercial building electrical systems
  • Industrial facility wiring projects
  • Multi-unit residential properties
  • Professional office electrical infrastructure
  • Retail establishment electrical systems

Why Choose Steel City Quality?

Steel City provides reliable electrical enclosure solutions with durable steel construction and professional-grade performance. The square design and multiple knockout configuration ensure compatibility with standard electrical components while delivering the dependable quality professionals trust for critical electrical installations.

Manufacturer Resources

Product Specs

Cubic Capacity:
20 Cubic Inches
Knockouts:
5
Mounting Method:
Wall-/ceiling mounting
Number Of Outlet:
1
Outer Dimensions Inches :
13x18.5x10.75
Outer Quantity:
18
Unspsc:
39121308 Outlet box
Weatherproof:
N
Weight Uom:
1 lbs. Each
Department:
Electrical
Product Group:
Electrical Enclosures
Product Subgroup:
Boxes
Product Type:
Steel Outlet Boxes
Product Size:
3.28 Inches Length x 2.2 Inches Width x 3.52 Inches depth
Product Length:
83.312mm
Product Details:
Outlet Boxes
Product Color:
Silver
Product Shape:
Square
Product Material:
Steel
Product Width:
55.88mm
Product Depth:
89.408mm

Steel City MB120ADJ – Frequently Asked Questions

1) How many wires can I get into a 20 cubic inch Steel City outlet box?
The Steel City MB120ADJ square steel outlet box is rated at 20 cubic inches of box volume, which is the number you use for NEC box fill math. That capacity is what lets you land a device plus feed and switch-leg conductors without crowding the splices. It is a single-device box (one outlet position), so plan the fill around one device plus your conduit or cable conductors.
2) Can the Steel City MB120ADJ outlet box be used outdoors or in a wet location?
No. The MB120ADJ is not weatherproof, so keep it to dry interior locations. For an exterior wall, a damp basement wall, or anywhere subject to rain or washdown, you need a listed weatherproof box and a gasketed in-use cover instead.
3) Will a Steel City steel outlet box mount on a ceiling as well as a wall?
Wall and ceiling are both covered. The MB120ADJ steel outlet box is designated for wall and ceiling mounting, so the same part works for a switch or receptacle in a stud bay and for an overhead device location.
4) How many conduit or cable entries does the Steel City MB120ADJ box have?
Five knockouts, which gives you enough entry points to bring in a feed, a switch leg, and a downstream run without having to add a second box or drill the enclosure. Placement across the box faces means you can route from the back or the sides depending on how the framing sits.
5) What are the actual dimensions of the Steel City MB120ADJ outlet box?
The box measures 3.28 inches length by 2.2 inches width by 3.52 inches depth. That depth is what buys you the 20 cubic inch volume, so check your stud or joist cavity clearance before you set it, particularly on a furred-out masonry wall or a shallow ceiling assembly.
6) Is this a steel box or a plastic one, and does that matter for grounding?
It is steel, with a silver finish. A steel box is a conductive enclosure, so it has to be bonded as part of the equipment grounding path, unlike a nonmetallic box. That is also why steel is the common choice where conduit is the wiring method rather than plastic with NM cable.
7) Does the Steel City MB120ADJ come with a cover or a plaster ring?
What you are buying is the box itself. Covers, plaster rings, and mud rings are separate items, so add the ring that matches your device and your finished wall depth when you place the order. The box is square, which is the standard shape those rings are built to.
8) How do Steel City outlet boxes ship for a large job, and what is the case quantity?
Boxes come 18 to a case, with a shipping carton measuring 13 x 18.5 x 10.75 inches and an each weight of about 1 lb. For a multi-unit or commercial rough-in, that 18-per-case figure is the number to build your takeoff around.
9) What is the UNSPSC code for the Steel City MB120ADJ for our purchasing system?
It classifies under UNSPSC 39121308, outlet box. Institutional and government buyers loading this into a procurement catalog can use that code along with the manufacturer part number MB120ADJ from Steel City.
How fast can I get the Steel City MB120ADJ delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Steel City MB120ADJ come with a warranty?
Absolutely. The Steel City MB120ADJ is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Steel City MB120ADJ?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Steel City MB120ADJ from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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