Tweco 1040-1126 Mig Gun 400A 20 Ft Miller Connection

Product Description

The TWECO 1040-1126 is a Professional No. 4 Classic Series air-cooled MIG gun rated at 400 amps with a 20-foot lead cable. It accommodates wire diameters from 0.035 to 0.045 inches and delivers a 60% duty cycle when used with CO2 shielding gas. The oval-shaped handle features a silver-plated trigger and is balanced to pivot at its center, reducing operator fatigue during extended use. A 60-degree metal jacket conductor tube swivels a full 360 degrees around the handle for positioning flexibility. The three-layer conductor tube construction — copper tube, silicon-resin glass insulator, and metal jacket — provides a reliable current path to the contact tip. Designed for semi-automatic welding in medium to heavy-duty fabrication environments.

This MIG gun is suited for medium and heavy-duty fabrication in industrial, shop, maintenance and repair, and production settings. The Miller-style rear connection integrates with compatible Miller wire feeders via a fully insulated Mig-Kwik connection for fast hookup and disconnection at the feeder. The split-half handle case allows field repair of the Cablehoz without additional connectors, making it practical for environments where minimizing downtime matters. Two ball-point screws secure the Cablehoz and conductor tube. A steel spring strain relief at the rear of the handle supports the Cablehoz exit point, reducing wire feed issues during operation.

Key Features

• 400A rating with 60% duty cycle at CO2 gas, suitable for sustained industrial welding
• Oval handle balanced to pivot at center, reducing grip fatigue across welding positions
• 360-degree swiveling 60-degree metal jacket conductor tube for maneuverability
• Three-layer conductor tube construction: copper tube, silicon-resin glass insulator, and metal jacket
• Silver-plated trigger contacts with self-cleaning action on each engagement cycle
• Fully insulated Mig-Kwik connection for quick hookup and disconnection at the wire feeder
• Field-repairable split-half handle case; steel spring strain relief minimizes wire feed issues

Compatibility

Features a Miller-style rear connection for use with compatible Miller wire feeders. Front-end consumables are interchangeable with the Tweco Spray Master series and other Tweco Professional No. Series guns.

Installation Notes

Installation and service of MIG welding equipment should be performed by a qualified welding technician following the equipment manufacturer's instructions and applicable workplace safety codes. Disconnect and lock out power to the wire feeder before connecting or disconnecting the gun cable. Verify that the Mig-Kwik connection is fully seated and the two ball-point screws are snug before initiating a weld. Inspect the conductor tube, Cablehoz, and contact tip for wear or damage before each use.

Technical Specifications

• Amperage: 400A
• Duty Cycle: 60% at CO2 gas
• Wire Diameter Range: 0.035 to 0.045 inches
• Lead Cable Length: 20 feet
• Cooling Type: Air-cooled
• Conductor Tube Angle: 60 degrees
• Rear Connection Style: Miller style
• Package Length: 23.25 inches
• Package Width: 14.25 inches
• Package Height: 3.32 inches
• Weight: 15 pounds
• UPC: 608246012667

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1040-1126