Marine Sheet Metal Fabrication | MJM Manufacturing Miami, FL

Precision Sheet Metal Fabrication for Marine & Boating Industry

MJM Manufacturing provides precision sheet metal fabrication for marine OEM manufacturers, boat builders, marina equipment suppliers, and marine electronics integrators. We produce dock boxes, marine power supply enclosures, boat brackets and mounting hardware, dock equipment components, and precision fabricated assemblies for marine applications — all from our 44,000 sq ft facility in Miami, Florida.

Located in South Florida — one of the largest marine markets in the world — MJM Manufacturing has deep experience fabricating the corrosion-resistant aluminum, stainless steel, and galvanized components that marine environments demand. With 47 years of precision fabrication experience and five Amada laser cutting systems, MJM delivers the quality and production capacity that marine OEM manufacturers depend on.

Marine Industry Experience

MJM Manufacturing has hands-on experience fabricating components across a wide range of marine applications:

  • Dock boxes — precision fabricated aluminum and stainless steel dock storage boxes for marina and waterfront applications requiring tight corners, clean welds, durable finishes, and hardware insertion for hinges, latches, and locking mechanisms
  • Marine power supply enclosures — weatherproof and corrosion-resistant enclosures for shore power pedestals, marine electrical systems, and dockside power distribution equipment
  • Boat brackets and mounting hardware — precision fabricated stainless steel and aluminum brackets, rod holders, T-top supports, radar mounts, outboard motor brackets, and structural mounting hardware for recreational and commercial vessels
  • Marina dock equipment components — structural and functional sheet metal components for dock hardware, cleats, dock bumpers, and marina infrastructure
  • Marine electronics enclosures — precision housings and panels for marine navigation, communication, and control systems
  • Shore power pedestals and panels — fabricated enclosures and structural components for marina shore power distribution systems
  • Bilge pump and marine systems housings — corrosion-resistant enclosures for marine mechanical and electrical systems
  • Custom marine OEM components — prototype through production fabrication for marine product manufacturers

Materials for Marine Environments

Marine environments are among the most demanding for metal fabrication — salt air, humidity, UV exposure, and constant moisture attack any material not specifically selected and finished for marine use. MJM Manufacturing works with the materials that stand up to marine conditions:

  • Marine grade aluminum (5052, 5083, 6061) — the most common material for dock boxes, boat components, and marine enclosures. Lightweight, corrosion resistant, and weldable. 5052 alloy is specifically rated for salt water exposure.
  • Stainless steel (304, 316) — 316 stainless steel is the marine industry standard for hardware, brackets, and components exposed directly to salt water. MJM fabricates and welds stainless steel components for marine applications requiring maximum corrosion resistance.
  • Galvanized steel — zinc-coated steel for marine structural applications where weight is less critical and cost efficiency matters.
  • Hot dip galvanized compatible fabrication — structural components designed for post-fabrication hot dip galvanizing
  • Copper and brass — specialty marine electrical and plumbing components

Marine Fabrication Capabilities

MJM Manufacturing’s fully integrated facility provides every process needed for marine sheet metal components from raw material to finished product:

  • CNC fiber laser cutting — 4 Amada Ensis and 1 Amada Ventis fiber lasers, tolerances to ±0.005″, aluminum up to 0.625″, stainless steel up to 0.625″
  • Press brake forming — 9 Amada forming machines including 14-foot, 240-ton capacity for large dock box panels and marine structural components
  • Plate rolling — Knuth rollers in 3-foot, 4-foot, and 7-foot widths for curved dock box components, cylindrical enclosures, and round marine housings
  • TIG welding — certified TIG welding of aluminum and stainless steel to AWS D1.2 and D9.1M standards — clean, watertight welds critical for marine enclosures
  • MIG welding — structural MIG welding for marine assemblies
  • IPG fiber laser welding — 9 systems for precision low-distortion welds on thin gauge marine components
  • Hardware insertion — 4 Haeger presses for installing hinges, latches, fasteners, and marine hardware into fabricated enclosures
  • Powder coating — durable marine-grade powder coat finishes coordinated through trusted finishing partners
  • Sand blasting — surface preparation for marine coating systems
  • Silk screening and laser marking — component identification and product branding
  • Assembly — hardware kitting and subassembly for marine OEM customers

Dock Box Fabrication

MJM Manufacturing has extensive experience producing precision fabricated dock boxes for marina operators, dock equipment manufacturers, and marine OEMs. Dock boxes require a specific combination of fabrication skills — tight corner bends for a clean finished appearance, watertight TIG welded seams, accurately positioned hardware cutouts for hinges and latches, and durable powder coat or anodized finishes that stand up to salt air and UV exposure year-round.

Our 14-foot press brake handles the large panel sizes typical of dock box construction. Our TIG welding department produces clean, watertight corner and seam welds. Our Haeger hardware insertion presses install hinges, piano hinges, latches, and locking hardware precisely and consistently. And our finishing partners provide marine-grade powder coat finishes in a full range of colors.

MJM supports dock box manufacturers from prototype development through high-volume production runs — with consistent quality and lead times that marina supply chains depend on.

Marine Power Supply Enclosures

Shore power pedestals, dockside power distribution panels, and marine electrical enclosures require precision fabricated housings that protect sensitive electrical equipment from salt air, moisture, and UV exposure while providing clean, professional appearance for marina installations. MJM Manufacturing fabricates aluminum and stainless steel enclosures for marine power supply and distribution applications — with hardware insertion for conduit knockouts, breaker cutouts, and panel mounting, and durable powder coat finishes rated for marine environments.

Boat Brackets & Mounting Hardware

MJM Manufacturing produces precision fabricated stainless steel and aluminum brackets and mounting hardware for boat builders and marine accessory manufacturers. Our laser cutting and press brake forming capabilities produce consistent, accurate brackets with clean cut edges and precise bend angles — critical for boat hardware that needs to fit correctly and look professional on a finished vessel. We support marine hardware manufacturers from prototype designs through production runs with consistent quality and fast turnaround.

Why Marine OEMs Choose MJM

  • South Florida location — Miami is one of the largest marine markets in the world. MJM is local to South Florida boat builders, marina operators, and marine equipment suppliers.
  • 47 years of precision fabrication — deep experience with the tight tolerances, clean welds, and durable finishes marine products demand
  • Certified TIG welding of aluminum and stainless — AWS D1.2 (aluminum) and D9.1M (sheet metal) qualified welders producing watertight welds for marine enclosures
  • 14-foot press brake — handles large dock box panels and marine structural components in a single bend operation
  • Knuth plate rollers up to 7 feet — cylindrical and curved marine components produced in-house
  • Marine grade material expertise — 5052 and 5083 marine aluminum, 316 stainless steel, galvanized fabrication
  • Hardware insertion in-house — Haeger presses for hinges, latches, and marine hardware installation
  • Prototype through production — supports new product development and ongoing production runs
  • AS9100 and ISO 9001 certified — quality systems that marine OEM supply chains can rely on
  • 24–48 hour quote turnaround — responsive to the fast-moving marine product development cycle

Frequently Asked Questions — Marine Fabrication

Does MJM Manufacturing fabricate dock boxes?

Yes. MJM Manufacturing has extensive experience producing precision fabricated dock boxes in aluminum and stainless steel. We handle the full production process including laser cutting, forming, TIG welding, hardware insertion for hinges and latches, and coordination of marine-grade powder coat finishing.

What marine grade materials does MJM work with?

We work with marine grade aluminum (5052, 5083, 6061), stainless steel (304 and 316), galvanized steel, copper, and brass. For salt water exposed applications we typically recommend 5052 or 5083 aluminum or 316 stainless steel. Contact us at sales@mjmmfg.com to discuss material selection for your specific application.

Does MJM TIG weld aluminum and stainless steel for marine applications?

Yes. MJM Manufacturing has certified TIG welders qualified to AWS D1.2 (Structural Welding — Aluminum) and AWS D9.1M (Sheet Metal Welding Code). We produce watertight TIG welded seams on aluminum and stainless steel marine enclosures and dock boxes.

Can MJM fabricate large dock box panels?

Yes. Our Amada HRB 2204 press brake has a 14-foot bending length and 240-ton capacity — handling the large panel sizes typical of dock box construction in a single bend operation. Our Knuth plate rollers in 3-foot, 4-foot, and 7-foot widths handle curved and cylindrical marine components.

Does MJM offer powder coating for marine applications?

Yes. As part of our turn-key service offering, MJM coordinates marine-grade powder coat finishing through trusted finishing partners. Your parts are managed through our quality system from fabrication through finished coating — you deal with MJM only, not a separate finishing vendor.

Does MJM support marine product prototypes?

Yes. MJM Manufacturing supports marine OEM manufacturers from prototype development through full production runs. Many marine product customers start with a prototype to validate design and then transition to ongoing production with MJM. Our engineering team provides DFM review before the first prototype is cut.

How do I get a quote for a marine fabrication project?

Email your drawings and project details to sales@mjmmfg.com with material, gauge, quantity, and any finishing requirements. Our engineering team responds within 24 to 48 hours. You can also call us at (305) 620-2020.

Contact MJM Manufacturing to discuss your marine fabrication project or request a quote at sales@mjmmfg.com or (305) 620-2020.