24AH-75 - Tweco 24AH-75 Heavy Duty Adjustable MIG Nozzle 3/4" Bore (2-Pack)

Heavy-Duty Adjustable MIG Nozzle for Tweco No. 4 Guns

The Tweco 24AH-75 (Part Number 1240-1230) is a premium heavy-duty MIG welding nozzle designed to meet the rigorous demands of industrial fabrication. Sold in a convenient pack of two, these nozzles are engineered for compatibility with Tweco No. 4 series MIG guns and the Spray Master 450 series. The "24" series designation indicates its fitment for standard 400-amp class equipment, making it a staple in heavy manufacturing, structural steel, and shipbuilding environments.

This specific model features a large 3/4-inch (19.05 mm) bore, which is critical for applications requiring high gas flow rates, such as spray transfer welding or when working with larger diameter flux-cored wires. The wide opening ensures a broad umbrella of shielding gas, effectively protecting the large molten weld pool typical of high-amperage welding from porosity and atmospheric contamination. The nozzle is constructed from a high-quality copper alloy that offers excellent thermal conductivity, rapidly dissipating heat to prevent overheating and extending the service life of the front-end consumables.

The "AH" in the model number stands for Adjustable and Heavy Duty. The heavy-duty classification means the nozzle walls are thicker and the insulation is more robust compared to standard duty counterparts, providing superior resistance to heat and physical abuse. The adjustable slip-on design allows the welder to slide the nozzle up or down the nozzle insulator (typically part 34A or 34CT), thereby customizing the contact tip recess. This adjustability is vital for controlling wire stick-out and adapting to different joint configurations, ensuring optimal arc characteristics and penetration.

Key Specifications:

• Part Number: 1240-1230
• Model: 24AH-75
• Bore Size: 3/4" (19.05 mm)
• Type: Adjustable, Heavy Duty
• Compatibility: Tweco No. 4 / Spray Master 450
• Packaging: Pack of 2