Enclosure Fabrication · Miami Gardens, Florida

Electrical Enclosure Fabrication

Custom electrical enclosures, control boxes, cabinets and panels built to your drawings in carbon steel, galvanized, stainless steel and aluminum. We fabricate NEMA Type 1, 3R, 4, 4X and 12 style designs with welded seams, door hardware and gasketing, finished and ready for your components.

Request an Enclosure Quote

Steel · Stainless · Aluminum|Welded and Gasketed|Powder Coated|AS9100 Rev D · ISO 9001:2015|Prototype to Production

Overview

Enclosure Fabrication From One Source

An electrical enclosure touches almost every process in a sheet metal shop. Bodies, doors and back panels are cut on five Amada lasers (one Ventis 4 kW fiber, three Ensis 3 kW fiber and one CO2) on 5 x 10 ft tables or punched on our Amada turret, formed on nine Amada press brakes, welded, fitted with studs and standoffs, finished and assembled. Because all of it is managed by one team, the door fits the body and the hole pattern matches the back panel when the box reaches you.

We build to your design. For general product enclosures see custom sheet metal enclosures; for rack hardware see 19-inch racks and cabinets.

Enclosure Types

NEMA-Type Enclosures We Fabricate

Type 1

Indoor general-purpose boxes, wireways, junction boxes and control cabinets in cold rolled or galvanized steel, usually powder coated.

Type 3R

Outdoor rain-tight designs with drip shields, overlapping doors and drain provisions, in galvanized, galvanneal, aluminum or stainless.

Type 4 and 4X

Watertight washdown enclosures with continuously welded seams and gasketed doors. 4X designs in 304 or 316 stainless steel or aluminum for corrosion resistance.

Type 12

Indoor industrial enclosures sealed against dust and dripping liquids: welded seams, gasketed doors and no open knockouts.

About ratings: MJM fabricates the enclosure to your drawing and specification. The NEMA type rating or any UL listing belongs to the enclosure design and the company that owns it, and is established by that company with its testing laboratory. MJM does not certify or list enclosures. If you hold a listed design, we build it to your controlled drawings and procedures.

Features

Enclosure Features We Build In

Seams: continuous TIG and fiber laser welds, ground and blended where the drawing calls for it. Laser welding keeps thin stainless and aluminum flat. See welding services.
Doors and covers: formed door pans, stiffeners, hinges, latches and gasket channels, with gaskets installed at assembly.
Hardware: PEM studs, nuts and standoffs for back panels, DIN rail and grounding, installed on four Haeger presses. See hardware insertion.
Cutouts and knockouts: connector, display, fan and conduit openings laser cut to ±0.005 in.; louvers and knockouts punched from our tool library.
Back panels and subpanels: galvanized or painted steel panels, cut and formed with the enclosure so they fit.
Finish: powder coat in standard and custom colors, paint, plating, or brushed and passivated stainless. See metal finishing.
Marking: laser etched part numbers, labels and logos.

Materials

Enclosure Materials

Material	Typical Use
Cold rolled steel	Indoor Type 1 and 12 enclosures, powder coated.
Galvanized and galvanneal	Outdoor Type 3R boxes and back panels; galvanneal takes paint and powder well.
304 and 316 stainless steel	Type 4X washdown, food, marine and coastal installations.
5052 aluminum	Lightweight outdoor and transportation enclosures; anodized, chem filmed or powder coated.

We laser cut mild steel to 1 in. and stainless and aluminum to 5/8 in., so mounting plates and heavy bases come from the same shop. Details on materials and tolerances.

Who Buys

Industries We Build Enclosures For

Power distribution and energy equipment, control panel builders, data center infrastructure, telecommunications, kiosks and EV charging, transit, medical devices, and defense electronics. Quantities run from one prototype box to scheduled production releases.

Straight Talk

Where MJM Is Not the Right Fit

If a catalog enclosure in a standard size does the job, buy the catalog enclosure. It will cost less than a custom build. We also do not wire panels or install electrical components.

Custom fabrication pays when the size, cutouts, mounting or material are specific to your product, when you need the same box repeatedly with your hardware and finish already in it, or when you want your own design built in the USA under a documented quality system.

FAQ

Electrical Enclosure Questions

Does MJM fabricate custom electrical enclosures?

Yes. MJM Manufacturing fabricates custom electrical enclosures, control boxes, cabinets and panels to customer drawings in carbon steel, galvanized steel, stainless steel and aluminum at its Miami Gardens, Florida facility.

Can MJM build NEMA 4X stainless steel enclosures?

Yes. MJM builds Type 4 and 4X style enclosures in 304 and 316 stainless steel and aluminum with continuously welded seams and gasketed doors, to the customer design. The NEMA rating or UL listing itself belongs to the design owner; MJM does not certify or list enclosures.

What is the difference between NEMA 3R, 4, 4X and 12 enclosures?

Type 3R is an outdoor rain-tight enclosure. Type 4 is watertight for indoor or outdoor washdown. Type 4X adds corrosion resistance, usually stainless steel or aluminum. Type 12 is an indoor industrial enclosure sealed against dust and dripping liquids.

Is there a minimum quantity for custom enclosures?

No. MJM builds single prototype enclosures, pilot quantities and production runs.

Can enclosures be delivered powder coated and assembled?

Yes. MJM delivers enclosures powder coated, painted, plated or passivated, with hardware, hinges, latches and gaskets installed and laser marked if required.

What files are needed for an enclosure quote?

A STEP model and PDF drawing with material, gauge, finish, hardware callouts and quantities. Quotes are returned in 24 to 48 hours from sales@mjmmfg.com.

Custom Sheet Metal Enclosures: complete enclosures from one source.
19-Inch Racks and Equipment Cabinets: rail accuracy and squareness under load.
Stainless Steel Fabrication: 304 and 316 cut, formed, welded and finished.
Welding Services: fiber laser, TIG, MIG and spot welding to AWS D17.1, D1.1, D1.2 and D9.1M.
Hardware Insertion and PEM Fasteners: four Haeger presses plus automated insertion.
Metal Finishing and Powder Coating: powder coat, anodize, chem film, passivation and plating on one PO.
CNC Punching Services: Amada turret punching with 794 tools on the shelf.

Send Us Your Enclosure Drawings

STEP files and PDF drawings to sales@mjmmfg.com or (305) 620-2020. Quotes in 24 to 48 hours.

Request a Quote Contact Us

Ronald Travieso

Working with MJM Manufacturing has been one of the best vendor experiences I've had. The parts matched my samples perfectly, and even the packing was done with real care — clean, organized, and professional. Of all the vendors I've worked with, they're by far the most organized and quality-focused. Great communication from start to finish. Highly recommend them for custom fabrication work.

Robert Cooler

MJM is wonderful to deal with. They have worked diligently and have produced my projects thus far to the highest standards.

Israel Schechter

I have been ordering parts from MJM Manufacturing for many years, and they have consistently exceeded my expectations. Their quality, professionalism, and attention to detail are outstanding. Every order is handled efficiently, delivered on time, and manufactured to the highest standards. The team at MJM is knowledgeable, responsive, and always willing to go the extra mile to ensure customer satisfaction. It is rare to find a company that maintains such a high level of consistency over many years. I highly recommend MJM Manufacturing to anyone looking for a reliable partner for complex, precision sheet metal parts and assemblies. I. Schechter, Former President of GBI Intralogistics Solutions, Current Owner/President of IPSTEC, Aventura, Florida

Richard Havass

As a customer, I have been working with MJM Manufacturing for approximately 35 years. The expertise of Mike Mijares and his team at MJM is top notch. Whenever I have a new part design, I typically review the design of the part with MJM to ensure that I am using the most cost-efficient manufacturing process to produce the parts as economically as possible. There was a part that we had made years ago using a progressive die to emboss a curved channel into a sheet metal part. The cost of the progressive die for this part was $55K. The redesign of the part from MJM consisted of $1200 in tooling to make the new part profile. Parts came out great and saved tens of thousands in tooling. Lastly, whether MJM produces a prototype or a production run, the appearance of the part is pristine, no tool marks or scratches on any part. In the 35 years that I have worked with Mike and his team, I have found them to be one big family. Mike’s love for his business is refreshing! You rarely see a person that is so charged to get up for work every day! Richard Havass Mechanical Engineering Manager JCI-Sensormatic

Sulen Ojeda Fuentes

Esta fábrica está llena de muy buenos profesionales son una gran familia trabajadores de años con muy buena experiencia .lo recomiendo porque son un gran equipo. Y realizan muy buen trabajo.