Tweco 1240-1220 Mig Nozzle 5/8 Inch Bore 450 Amp Copper

Product Description

The TWECO 1240-1220 is an adjustable copper MIG welding nozzle designed for use with Tweco No. 4 MIG guns rated up to 450 amps. The nozzle is cut and formed from 122 DHP copper alloy tubing, providing reliable thermal conductivity for medium to heavy duty welding applications. The bore measures 0.625 inches and the nozzle body is 3.42 inches in length with a 0.97-inch outer diameter. The contact tip relationship is adjustable from recessed to flush to protruding, allowing the welder to match tip positioning to the specific joint geometry. The part number is rolled and stamped on the outer surface for quick identification in the field. Sold in a pack of 2.

This nozzle is suited for medium to heavy duty MIG welding applications requiring up to 450 amps of output. The adjustable tip-to-nozzle relationship makes it versatile across multiple weld joint types. Recessed positioning suits higher heat applications and longer electrical stick-out scenarios, including tack, spot, and stitch welding where the nozzle may contact the work piece. Flush positioning is used where shorter stick-out and tighter arc lengths are needed. Protruding positioning is common when welding open root pipe or accessing tight weld joints. Licensed welders and professional fabricators working with Tweco No. 4 MIG gun platforms will find this nozzle a direct-fit consumable replacement.

Key Features

• Adjustable contact tip relationship: recessed, flush, or protruding positions available
• Nozzle housing cut and formed from 122 DHP copper alloy tubing for high thermal conductivity
• Part number rolled and stamped on outer surface for fast field identification
• Slides over standard nozzle insulator Part No. 34A (Stock No. 1340-1100)
• Rated for use up to 450 amps for medium to heavy duty MIG welding
• Sold as a 2-piece pack

Compatibility

Designed for use with Tweco No. 4 MIG guns rated up to 450 amps. Compatible with the standard Tweco nozzle insulator Part No. 34A (Stock No. 1340-1100).

Installation Notes

Installation should be performed by a qualified welder or welding equipment technician. Disconnect and de-energize the MIG gun and power source before replacing nozzle consumables. Ensure the nozzle insulator is in good condition before seating the nozzle to avoid arcing or premature wear. Adjust tip-to-nozzle positioning before resuming welding to match the requirements of the joint type being performed.

Technical Specifications

• Bore Diameter: 0.625 inches
• Outer Diameter: 0.97 inches
• Length: 3.42 inches
• Amperage Rating: 450 amps
• Material: 122 DHP Copper Alloy
• Weight: 0.33 pounds
• Quantity per Pack: 2

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1220