Tweco 1240-1206 Mig Nozzle 3/4 Inch Bore 450A Heavy Duty

Product Description

The TWECO 1240-1206 is a heavy-duty MIG welding nozzle rated for applications up to 450 amps. It features a 3/4-inch bore with a flush contact tip relationship of 0.062 inches, making it suited for applications where shorter electrical stick-out and tighter arc lengths are required. The nozzle is constructed from 122 DHP copper alloy tubing and uses a three-piece design that integrates the housing, insert, and insulator into a self-contained assembly without requiring an additional insulator. Licensed welders and professional fabricators working on medium to heavy-duty MIG setups will find this nozzle compatible with standard gas diffuser configurations. The part number is rolled and stamped on the outer surface for quick field identification.

This nozzle is intended for medium to heavy-duty MIG welding applications up to 450 amps. The flush tip geometry brings the contact tip closer to the workpiece, which is appropriate for shorter electrical stick-out scenarios and tighter arc lengths. It is used across industrial fabrication, structural welding, and heavy manufacturing environments where consistent gas coverage and weld quality are critical. The nozzle is sold in a pack of 2 units.

Key Features

• Rated for welding applications up to 450 amps
• 3/4-inch bore with flush contact tip relationship at 0.062 inches
• Three-piece design: copper alloy housing, solid brass machined insert, and G7 silicone insulator — no additional insulator required
• Nozzle insert crimped in place to slide over the metal spring of the gas diffuser
• 122 DHP copper alloy construction for durability and thermal conductivity
• Part number rolled and stamped on outer surface for easy identification in the field

Compatibility

Designed as an OEM-style replacement nozzle for standard gas diffuser configurations used in medium to heavy-duty MIG welding guns rated up to 450 amps.

Installation Notes

Installation is performed by qualified welders or MIG equipment technicians. Before servicing the gun, disconnect the welding machine from its power source and allow all components to cool completely. The nozzle slides over the metal spring on the gas diffuser and should seat firmly without forcing. Inspect the nozzle insulator and insert for wear at each replacement interval to maintain proper gas shielding and electrical insulation.

Technical Specifications

• Amperage Rating: 450 amps
• Bore Size: 3/4 inch
• Tip Relationship: Flush, 0.062 inches
• Housing Material: 122 DHP copper alloy
• Insert Material: Solid brass
• Insulator Material: G7 silicone
• Length: 3.1 inches
• Width: 1.1 inches
• Height: 1.1 inches
• Weight: 0.21 pounds
• Sold As: 2 per pack

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1206