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

Packaging: pack of 1
$1,596.63/EA $1,166.34/pack of 1 only $1,166.34/EASave 27%

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SKU: TWE1040-1137 Categories: , ,

OVERVIEW

Industry Standard Tweco No. 4 MIG Gun with Miller Connection

The Tweco No. 4 MIG Gun (SKU: 10401137) is a legendary piece of equipment in the welding industry, renowned for its rugged durability and high-performance capabilities. Designed for professional welders who demand reliability, this air-cooled MIG gun is rated at 400 Amps at a 60% duty cycle using CO2 gas, making it suitable for a wide range of heavy-duty industrial applications. Whether you are working in structural steel fabrication, heavy equipment manufacturing, or general maintenance and repair, the Tweco No. 4 delivers consistent arc stability and wire feeding performance.

This specific model comes pre-configured with a Miller-style back-end connection, allowing for seamless integration with compatible Miller wire feeders and power sources. The 15-foot (5-meter) cable assembly provides ample reach for working around large assemblies without compromising wire feed smoothness. The cable itself is constructed with high-quality materials to resist abrasion, cuts, and heat, ensuring a long service life even in the toughest shop environments.

Maintenance is straightforward with the Tweco No. 4. It utilizes the widely available and economical Tweco 14 Series contact tips, 24 Series gas nozzles, and 54 Series gas diffusers. The gun features a 360-degree rotatable conductor tube, allowing welders to adjust the torch angle for optimal access to difficult joints. The ergonomic handle is designed to fit comfortably in the hand, reducing operator fatigue during extended welding sessions. With its field-repairable design and robust construction, the Tweco No. 4 remains a top choice for welders seeking a dependable 400A MIG gun.

Key Technical Specifications

  • Amperage Rating: 400 Amps @ 60% Duty Cycle (CO2)
  • Cable Length: 15 Feet (approx. 5 Meters)
  • Connection Type: Miller Direct Plug
  • Cooling: Air Cooled
  • Wire Capacity: Standard setup typically .035"-.045", capable up to 5/64" with liner change
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.