{"product_id":"tweco-1240-1221-mig-welding-nozzle-5-8-inch-bore-450a","title":"Tweco 1240-1221 Mig Welding Nozzle 5\/8 Inch Bore 450A","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe TWECO 1240-1221 is a heavy duty short stop copper MIG welding nozzle designed for use with Tweco No. 4 MIG guns rated up to 450 amps. The nozzle housing is cut and formed from 122 DHP copper alloy tubing, giving it the thermal conductivity needed for sustained high-amperage work. With a 5\/8 inch (0.625 inch) bore diameter and an overall length of 3.48 inches, it maintains a recessed contact tip relationship of 0.125 to 0.156 inches. This recess geometry suits applications requiring longer electrical stick-out or situations where the nozzle may contact the workpiece. Sold as a pack of 2.\u003c\/p\u003e\u003cp\u003eThis nozzle is intended for medium to heavy duty MIG welding applications up to 450 amps. The recessed tip design makes it well suited for higher heat environments where extended electrical stick-out improves arc control and reduces spatter buildup at the nozzle face. It slides over the standard nozzle insulator, part number 34A (stock number 1340-1100), and is compatible with Tweco No. 4 standard gas diffuser configurations. Welding professionals working on structural, fabrication, or industrial maintenance applications will find this nozzle a direct fit for their existing No. 4 gun setup.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e122 DHP copper alloy construction for high thermal conductivity and durability in sustained high-amperage welding\u003c\/li\u003e\n\u003cli\u003e5\/8 inch bore with 0.97 inch OD accommodates heavy shielding gas flow at up to 450 amps\u003c\/li\u003e\n\u003cli\u003eRecessed contact tip relationship of 0.125 to 0.156 inches reduces spatter adherence and suits longer stick-out applications\u003c\/li\u003e\n\u003cli\u003ePart number roll-stamped on the exterior surface for fast field identification\u003c\/li\u003e\n\u003cli\u003eSlides over standard nozzle insulator part 34A (stock number 1340-1100) for straightforward installation\u003c\/li\u003e\n\u003cli\u003eSold as 2 per pack\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with Tweco No. 4 MIG guns with standard gas diffuser configurations rated up to 450 amps. Mounts over standard nozzle insulator part number 34A (stock number 1340-1100).\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified welding technician with the MIG gun fully de-energized and the wire feeder disabled before handling nozzle components. Ensure the nozzle insulator is clean and undamaged before sliding the nozzle into position. Inspect the nozzle bore for spatter buildup regularly, as excessive accumulation can restrict shielding gas coverage and degrade weld quality. Follow all applicable AWS and shop safety guidelines when servicing MIG gun consumables.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore Diameter\u003c\/strong\u003e: 0.625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNozzle Length\u003c\/strong\u003e: 3.48 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 0.97 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Amperage\u003c\/strong\u003e: 450 amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecessed Tip Relationship\u003c\/strong\u003e: 0.125 to 0.156 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: 122 DHP copper alloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Weight\u003c\/strong\u003e: 0.33 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Width\u003c\/strong\u003e: 1.1 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Height\u003c\/strong\u003e: 1.1 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Length\u003c\/strong\u003e: 3.4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold As\u003c\/strong\u003e: 2 per pack\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: 1240-1221\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TWECO","offers":[{"title":"Default Title","offer_id":51345367826738,"sku":"1240-1221","price":29.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310545938.jpg?v=1782056007","url":"https:\/\/voomisupply.com\/products\/tweco-1240-1221-mig-welding-nozzle-5-8-inch-bore-450a","provider":"Voomi Supply","version":"1.0","type":"link"}