Tweco 1240-1876 Heavy Duty Mig Nozzle 3/4 Inch Bore

Product Description

The TWECO 1240-1876 is a heavy duty MIG welding nozzle built for the Velocity2a platform, featuring a 3/4 inch bore and a one-thread design that reduces the total number of thread interfaces compared to standard MIG consumables. Most conventional nozzles use two or three sets of threads; the Velocity2a reduces that to one. The mating threads pair brass against heat-treated stainless steel, combining a softer material with a harder one to resist seizing and cross-threading. The stainless threads on the gooseneck are designed for long-term durability, while the brass threads on the nozzle provide a secure grip without loosening under heat and vibration. Weighing 0.26 pounds, the nozzle measures approximately 2.25 inches in height.

This nozzle is suited for professional MIG welding applications where consistent nozzle-to-contact-tip flushness and reliable thread engagement are critical. The Velocity2a system supports multiple nozzle configurations, including fixed threaded styles that maintain a consistent flushness relationship between the nozzle opening and the contact tip, adjustable slip styles that allow the operator to reposition the nozzle for improved cleaning access, and spot weld styles designed for tack and spot welding with MIG. This part is sold individually and is appropriate for fabrication shops, structural welding, and maintenance welding environments where heavy duty consumables are required.

Key Features

• Single-thread interface reduces seizing and cross-threading compared to two- and three-thread conventional nozzle designs
• Brass nozzle threads mate against heat-treated stainless steel gooseneck threads for secure, no-tool engagement
• Fixed threaded configuration maintains consistent flushness between nozzle opening and contact tip
• Adjustable slip configuration allows welder to set flushness and improves access for cleaning
• Spot weld configuration supports tack and spot welding with MIG process
• 3/4 inch bore accommodates standard heavy duty MIG gun setups

Compatibility

Designed as a replacement nozzle for the Tweco Velocity2a heavy duty MIG gun platform. Verify gooseneck thread compatibility before installation.

Installation Notes

Installation is performed by qualified welders or welding equipment technicians. De-energize the welding power source and allow the gun to cool completely before removing or installing consumables. The Velocity2a nozzle is designed for tool-free installation; do not use pliers or wrenches on the nozzle threads, as overtightening can damage the brass threads. Inspect the gooseneck threads for wear or spatter buildup before threading on the new nozzle.

Technical Specifications

• Bore Size: 3/4 inch
• Height: 2.25 inches
• Width: 1 inch
• Length: 1 inch
• Weight: 0.26 pounds
• Thread Material (Nozzle): Brass
• Thread Material (Gooseneck): Heat-treated stainless steel
• Sold As: Each
• UPC: 608246434667

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1876