12401503 - Tweco 24CT-75 Coarse Thread MIG Nozzle, 3/4" Bore

Product Overview: Tweco 1240-1503 (24CT-75)

The Tweco 1240-1503, also known by the industry standard part number 24CT-75, is a heavy-duty MIG gun nozzle designed for professional welding applications. This nozzle is part of the widely used Tweco 24 Series consumables line, engineered to fit Tweco #2, #3, and #4 MIG guns (as well as compatible Spray Master series guns). The unit features a substantial 3/4-inch (19mm) bore, making it the largest bore option in the standard 24 series, suitable for high-heat applications where maximum gas flow is required.

Technically, the nozzle is defined by its "CT" designation, indicating a Coarse Thread connection. This threaded design screws directly onto the gas diffuser (such as the 54A or 52 series), providing a mechanical lock that prevents the nozzle from slipping off during operation while ensuring concentricity with the contact tip. The overall length is specified at 61.5mm (2.42 inches), which typically positions the contact tip slightly recessed or flush depending on the specific diffuser and tip combination used. The cylindrical body shape ("CYL") maintains a consistent diameter from the base to the orifice, distinguishing it from tapered bottle-neck designs.

Manufactured from a durable copper alloy, the 1240-1503 is built to withstand the intense radiant heat of high-amperage welding arcs. The wall thickness is optimized to conduct heat away from the front end, prolonging the life of the consumable and reducing the adherence of welding spatter. This specific SKU is an essential inventory item for fabrication shops utilizing standard Tweco-style MIG torches for structural steel, heavy equipment repair, and general industrial fabrication.