25CT-75 - Tweco Style 25CT-75 MIG Nozzle Housing, 3/4" Bore, Coarse Thread (2-Pack)

Heavy-Duty Copper Alloy Nozzle Housing for High-Amperage MIG Welding

The Tweco Style 25CT-75 MIG Nozzle is a premium replacement component designed to meet the rigorous demands of industrial fabrication and heavy manufacturing. Engineered as a direct replacement for the Tweco 1250-1430, this nozzle housing is machined from a solid copper alloy bar. This manufacturing process ensures exceptional dimensional stability and superior thermal conductivity compared to standard tubing-based nozzles. The high copper content facilitates rapid heat dissipation, a critical factor in preventing the adhesion of weld spatter and extending the service life of the front-end consumables during prolonged welding cycles.

This specific model features a large 3/4-inch (19mm) bore, making it particularly suitable for high-amperage applications where extensive shielding gas coverage is required to protect the weld pool from atmospheric contamination. It is rated for use in medium to heavy-duty applications up to 550 amperes. The nozzle utilizes a coarse thread design, which provides a robust and secure connection to the nozzle insulator, preventing cross-threading and ensuring concentricity with the contact tip. This is a "housing-only" component, part of the classic two-piece nozzle system, meaning it threads onto a separate nozzle insulator (such as the 32 or 34CT series) rather than threading directly onto the conductor tube. This design allows operators to replace only the copper housing when worn, retaining the insulator if it remains functional, thereby optimizing operational costs.

Identification and inventory management are simplified thanks to the rolled stamped part number on the exterior surface. Whether utilized in automated setups or manual handheld MIG guns, the 25CT-75 offers reliable performance and consistent gas flow characteristics. It is compatible with a wide range of Tweco-style MIG guns, including the Professional No. 2, No. 3, and No. 4 series, provided the correct coarse-thread insulator is employed.