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10401137 - Tweco Classic No. 4 MIG Gun 400A 15ft Miller Plug

Packaging: pack of 1
$1,596.63/EA $1,158.01/pack of 1 only $1,158.01/EASave 27%

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OVERVIEW

Tweco No. 4: The 400-Amp Workhorse for Miller Welders

When it comes to heavy-duty MIG welding, few tools are as trusted as the Tweco No. 4 MIG Gun. This 15-foot torch is built to handle the heat, rated for 400 Amps, making it the go-to choice for fabricators pushing high wire speeds and thick materials. If you are running a Miller wire feeder and need a gun that can take a beating and keep on welding, this Tweco Classic series gun is the upgrade you’ve been looking for. It combines the proven performance of the Tweco design with a direct Miller plug, so you can hook it up and start welding immediately.

The "No. 4" is famous for its simplicity and toughness. It features a heavy-duty coaxial cable that stands up to the rigors of the shop floor—drag it over steel, around corners, and through grime; it’s built to last. The handle is shaped to provide a secure grip, and the trigger action is crisp and reliable, designed to withstand thousands of cycles. One of the biggest advantages of running a Tweco gun is the consumables. You can find Tweco 14-series tips and 24-series nozzles almost anywhere, and they are cost-effective, keeping your running costs down over time.

Versatility is key in professional welding. The conductor tube on this gun can be rotated 360 degrees, giving you the flexibility to weld in out-of-position scenarios or tight corners without straining your wrist. The 15-foot length offers a great balance between reach and wire feed reliability. Whether you are welding mild steel, stainless, or flux-cored wires, the Tweco No. 4 provides the consistent electrical conductivity and gas coverage needed for X-ray quality welds. Don't settle for flimsy torches; equip your Miller machine with the industry standard for durability.

Why Choose the Tweco No. 4?

  • Proven Reliability: A design that has stood the test of time in the most demanding industries.
  • Easy Maintenance: Simple construction allows for quick liner changes and part replacements.
  • Comfort: Ergonomic handle design minimizes hand stress during long shifts.
  • Compatibility: Direct fit for Miller feeders eliminates the need for adapters.
Additional Information
Brand:Tweco
Amperage:400
Length:15 ft
Back End:Miller
Process Type:MIG (GMAW), Flux Cored (FCAW)
Torch Type:Air Cooled MIG Gun
Connection Type:Miller Direct Plug
Amperage Rating:400A @ 60% Duty Cycle
Cable Length:15 ft (5m)
Consumable Compatibility:Tweco 14 Series Contact Tips, Tweco 24 Series Nozzles, Tweco 54 Series Diffusers
Wire Size Capacity:Up to 5/64" (2.0mm)
Cooling Method:Air Cooled
Packaging Description:pack of 1

INCLUDED

  • 1 x Tweco No. 4 MIG Gun (400 Amp)
  • 1 x 15 ft (5m) Cable Assembly
  • 1 x Miller Back-End Connection
  • 1 x Standard Consumable Setup (Contact Tip, Nozzle, Diffuser)
  • 1 x Liner (Pre-installed)

APPLICATIONS

  • Structural Steel Fabrication
  • Heavy Equipment Manufacturing
  • Shipbuilding and Marine Repair
  • General Industrial Fabrication
  • Railcar Construction
  • Tank and Vessel Welding

FAQ

The Tweco No. 4 is rated at 400 Amps at a 60% duty cycle when using CO2 shielding gas.

Yes, this specific model (1040-1137) comes with a Miller-style back-end plug, making it directly compatible with most Miller wire feeders.

It uses the standard Tweco 14 Series contact tips (e.g., 14-35, 14-45).

The cable length is 15 feet (approximately 5 meters).

Yes, the Tweco No. 4 is excellent for Flux-Cored Arc Welding (FCAW) due to its high amperage capacity and durable construction.

The Tweco No. 4 typically uses the 24 Series nozzles, which are slip-on (adjustable) and held in place by the nozzle insulator.

While often set up for .035" or .045" wire, the Tweco No. 4 can handle wire diameters up to 5/64" (2.0mm) with the appropriate liner and contact tip.

Yes, the conductor tube (gooseneck) can be rotated 360 degrees to assist with welding in various positions.