Tweco 1240-1423 Mig Welding Nozzle 5/8 Inch Bore 450A

Product Description

The TWECO 1240-1423 is a coarse-threaded copper MIG welding nozzle designed for use with standard gas diffusers on medium to heavy duty MIG welding applications. Machined from solid 145 tellurium copper alloy bar stock, it delivers consistent dimensional stability and efficient heat dissipation at amperages up to 450 A. The bore measures 0.625 inches with an outer diameter of 1.07 inches and an overall length of 2.09 inches. The part number is roll-stamped on the outer surface for fast identification in the field. This is a two-piece nozzle design: the nozzle housing threads onto a separate nozzle insulator, which is sold separately.

This nozzle is suited for medium to heavy duty MIG welding environments where heat management and dimensional consistency are critical. The recessed contact tip relationship of 0.468 inches makes it appropriate for higher heat applications requiring longer electrical stick-out, or in situations where the nozzle may contact the work piece, such as tack, spot, and stitch welding. Licensed welding professionals and maintenance welders working in fabrication, structural, or industrial settings are the primary installers. Sold as a pack of 2.

Key Features

• Machined from solid 145 tellurium copper alloy bar for consistent dimensional stability and heat dissipation
• 0.625 inch bore diameter with 1.07 inch OD and 2.09 inch overall length
• Coarse thread design mates with standard gas diffusers
• Recessed tip relationship of 0.468 inches suited for longer electrical stick-out and high heat applications
• Part number roll-stamped on outer surface for easy field identification
• Two-piece design: nozzle housing threads onto nozzle insulator (insulator and housing sold separately)

Compatibility

Designed for use with TWECO standard gas diffusers in medium to heavy duty MIG welding setups rated up to 450 A. Nozzle housing and nozzle insulator are sold separately and must be compatible with the coarse-thread two-piece nozzle system.

Installation Notes

Installation is performed by a qualified welder or welding technician. Always de-energize and power down the welding machine before replacing front-end consumables. Thread the nozzle insulator onto the conductor tube first, then thread the nozzle housing onto the insulator — do not overtighten by impact. Inspect the contact tip recess relationship after assembly to confirm proper stick-out for the intended welding process.

Technical Specifications

• Bore Diameter: 0.625 inches
• Outer Diameter: 1.07 inches
• Overall Length: 2.09 inches
• Contact Tip Recess: 0.468 inches
• Maximum Amperage: 450 A
• Thread Type: Coarse thread
• Material: 145 tellurium copper alloy
• Design: Two-piece
• Package Quantity: 2 per pack
• Weight: 0.17 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1423