Tweco 1240-1301 Mig Welding Nozzle 3/8 Inch Bore

Product Description

The TWECO 1240-1301 is a tapered short stop copper MIG welding nozzle designed for use with Tweco No. 4 MIG guns rated up to 450 amps. The nozzle features a 3/8 inch (0.375 inch) bore, measures 3.49 inches in length, and is constructed from 122 DHP copper alloy tubing for reliable performance in high-heat environments. The housing is cut and formed from copper alloy tubing, and the part number is roll-stamped on the outer surface for quick field identification. This nozzle ships in a pack of 2. Licensed welders and MIG welding technicians working in fabrication, manufacturing, or structural welding install this component as a routine front-end consumable replacement.

This nozzle is suited for medium to heavy duty MIG welding applications requiring up to 450 amps of output. The recessed contact tip relationship of 0.125 to 0.156 inches makes it well suited for higher heat cycles, longer electrical stick-out situations, tack welding, spot welding, stitch welding, and applications where the nozzle may contact the workpiece. It slides over the standard nozzle insulator and can be repositioned to adjust the contact tip-to-nozzle relationship as needed for the weld joint.

Key Features

• Constructed from 122 DHP copper alloy tubing for high-heat durability
• 3/8 inch bore with 3.49 inch length and 3/4 inch OD
• Recessed contact tip relationship of 0.125 to 0.156 inches — suited for longer stick-out and nozzle-to-work contact scenarios
• Part number roll-stamped on outer surface for fast identification during consumable changes
• Slides over standard nozzle insulator with adjustable tip-to-nozzle positioning
• Sold as 2 per pack

Compatibility

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

Installation Notes

Installation and replacement of MIG gun nozzles should be performed by a qualified welder or welding technician. Always power down and de-energize the welding system before servicing front-end consumables. Slide the nozzle over the nozzle insulator and adjust the position to achieve the desired contact tip and nozzle relationship before resuming operation. Inspect nozzle condition regularly, as spatter buildup and heat cycling will degrade performance over time.

Technical Specifications

• Bore Size: 0.375 inches
• Nozzle Length: 3.49 inches
• Outer Diameter: 0.75 inches
• Recessed Tip Relationship: 0.125 to 0.156 inches
• Maximum Amperage: 450 amps
• Material: 122 DHP Copper Alloy
• Pack Quantity: 2 per pack
• Weight: 0.15 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1301