{"product_id":"tweco-1040-1129-mig-gun-400a-25-ft-miller","title":"Tweco 1040-1129 Mig Gun 400A 25 Ft Miller","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe TWECO 1040-1129 is a Professional No. 4 Classic Series air-cooled MIG gun rated at 400 amps with a 60% duty cycle using CO2 gas. Designed for semi-automatic MIG welding, it accepts wire sizes from 0.035 to 0.045 inches and ships with a 25-foot lead cable featuring a Miller-style rear connection. The conductor tube is a 60-degree metal jacket design with three-layer construction — copper tube, silicon-resin glass insulator, and outer metal jacket — for durability under sustained heat loads. The handle is an oval-shaped, high-impact crush-resistant plastic balanced to pivot at its center, reducing grip fatigue during extended use. Licensed HVAC and welding professionals in medium- to heavy-duty fabrication environments are the primary installers and operators.\u003c\/p\u003e\u003cp\u003eThis gun is suited for medium and heavy-duty fabrication, maintenance and repair, and production welding applications. The Miller-style rear connection makes it a direct replacement or upgrade option for shops already running Miller wire feeders. The fully insulated Mig-Kwik connection allows fast hookup and disconnection at the wire feeder, which shortens changeover time in production settings. The interchangeable front-end consumables are shared across the Tweco Spray Master series and Tweco Professional No. Series, reducing the variety of tips and nozzles a shop must stock.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e400A rating at 60% duty cycle with CO2 gas for sustained medium- and heavy-duty welding\u003c\/li\u003e\n\u003cli\u003eAccepts wire sizes 0.035 to 0.045 inches with a 25-foot cable for reach flexibility\u003c\/li\u003e\n\u003cli\u003eThree-layer conductor tube construction: copper tube, silicon-resin glass insulator, and metal jacket\u003c\/li\u003e\n\u003cli\u003eSilver-plated trigger contacts with self-cleaning action on every actuation\u003c\/li\u003e\n\u003cli\u003eSteel spring strain relief on the rear of the handle minimizes wire feed issues at the Cablehoz exit point\u003c\/li\u003e\n\u003cli\u003eTwo ball-point screws secure the Cablehoz and conductor tube; split-half handle case allows field repair without additional connectors\u003c\/li\u003e\n\u003cli\u003e60-degree metal jacket conductor tube swivels 360 degrees around the handle for quick replacement and positioning\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with Miller-style wire feeders via the Miller-style rear connection. Front-end consumables are interchangeable with the Tweco Spray Master series and Tweco Professional No. Series guns.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and setup should be performed by a qualified welding technician or industrial electrician familiar with MIG welding equipment. Power down and disconnect the wire feeder from its power source before connecting or disconnecting the gun. Verify that the wire feeder's drive roll groove matches the wire size in use before feeding wire through the gun. Follow the equipment manufacturer's guidelines and applicable ANSI or AWS safety standards when setting up or servicing MIG welding equipment.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 400 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuty Cycle\u003c\/strong\u003e: 60% with CO2 gas\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire Size Range\u003c\/strong\u003e: 0.035 to 0.045 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCable Length\u003c\/strong\u003e: 25 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConductor Tube Angle\u003c\/strong\u003e: 60 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRear Connection Style\u003c\/strong\u003e: Miller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling Method\u003c\/strong\u003e: Air-cooled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Length\u003c\/strong\u003e: 23 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Width\u003c\/strong\u003e: 14.6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Height\u003c\/strong\u003e: 3.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\u003c\/strong\u003e: 608246012698\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: TWECO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1040-1129\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TWECO","offers":[{"title":"Default Title","offer_id":51344536338738,"sku":"1040-1129","price":1329.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310545683.jpg?v=1782036845","url":"https:\/\/voomisupply.com\/products\/tweco-1040-1129-mig-gun-400a-25-ft-miller","provider":"Voomi Supply","version":"1.0","type":"link"}