Tweco 1240-1204 Heavy Duty Mig Nozzle 450A 1/2 Bore 2 Pack

Product Description

The TWECO 1240-1204 is a heavy duty MIG welding nozzle designed for use with 450 A Tweco SprayMaster MIG guns. The nozzle features a 1/2 inch bore, a 0.875 inch outer diameter, and measures 3.21 inches in length. It is constructed from 122 DHP copper alloy tubing using a three-piece design that integrates a nozzle housing, a solid brass machined insert, and a G7 silicone insulator. No additional insulator is required. The part number is roll-stamped on the outer surface for fast field identification. Sold as a 2-piece pack, this nozzle is intended for licensed welding professionals and fabricators working in medium to heavy duty applications.

This nozzle fits standard gas diffusers used on Tweco SprayMaster MIG guns rated up to 450 A. It is suited for medium to heavy duty welding environments where high heat output and extended run times are routine. The recessed tip geometry makes it appropriate for applications requiring longer electrical stick-out or situations where the nozzle may contact the workpiece, such as tack, spot, and stitch welding. The nozzle insert slides over the metal spring of the gas diffuser, and the G7 silicone insulator provides the electrical isolation needed between the nozzle and diffuser body.

Key Features

• Rated for welding applications up to 450 A with Tweco SprayMaster MIG guns
• Three-piece design: 122 DHP copper alloy housing, solid brass machined insert, G7 silicone insulator
• No additional insulator required — insulation is built into the assembly
• Part number roll-stamped on outer surface for quick identification in the field
• Recessed tip profile suited for longer electrical stick-out and workpiece contact scenarios
• Sold as a 2-piece pack

Compatibility

Designed for use with 450 A Tweco SprayMaster MIG guns equipped with standard gas diffusers. Fits the 3/4 inch standard gas diffuser interface. Consult Tweco documentation to confirm fitment with specific gun configurations.

Installation Notes

Installation is performed by qualified welders or MIG gun service technicians. Before replacing the nozzle, power down the welder and allow the gun to cool completely to avoid burns from residual heat. The nozzle insert slides over the metal spring on the gas diffuser — do not force the nozzle onto the diffuser. Inspect the diffuser and contact tip for wear before installing a new nozzle to ensure full assembly integrity.

Technical Specifications

• Amperage Rating: 450 A
• Bore Size: 1/2 inch
• Nozzle Length: 3.21 inches
• Outer Diameter: 0.875 inches
• Housing Material: 122 DHP copper alloy tubing
• Insert Material: Solid brass
• Insulator Material: G7 silicone
• Package Dimensions: 3.1 x 1.1 x 1.1 inches
• Weight: 0.21 pounds
• Sold As: 2 per pack
• UPC: 608246337159

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1204