Tweco 1240-1855 Mig Welding Nozzle 5/8 Inch Bore

Product Description

The TWECO 1240-1855 is a medium-duty MIG welding nozzle from the Velocity series, designed to simplify consumable management on MIG welding guns. It features a 5/8-inch bore and a threaded attachment system that reduces the total number of thread sets compared to standard MIG nozzles. The design pairs brass threads on the nozzle body against heat-treated stainless steel threads on the gooseneck. This soft-against-hard thread combination resists seizing and cross-threading, extending service life and reducing downtime during nozzle changes. The part ships as a single unit and weighs 0.17 pounds.

This nozzle is suited for medium-duty MIG welding applications in fabrication shops, manufacturing environments, and field repair work. It is intended for use with compatible Tweco Velocity MIG gun bodies and goosenecks that accept threaded nozzle connections. The fixed-threaded design maintains a consistent flushness relationship between the nozzle opening and the contact tip, which supports repeatable arc positioning. Welders and maintenance technicians working with solid wire or flux-core processes in a variety of base metal applications will find the tool-free installation and removal straightforward during scheduled consumable changes.

Key Features

• 5/8-inch bore sized for medium-duty MIG welding output ranges
• Single thread-set design reduces seizing, cross-threading, and installation complexity versus standard two- or three-thread consumable systems
• Brass nozzle threads mate against heat-treated stainless steel gooseneck threads for extended thread life
• Fixed threaded style maintains consistent flushness between nozzle opening and contact tip
• Tool-free nozzle replacement reduces changeover time at the gun

Compatibility

Designed for use with Tweco Velocity series MIG gun bodies and goosenecks that accept threaded medium-duty nozzle connections. Confirm gooseneck thread compatibility before installation.

Installation Notes

MIG nozzle replacement is typically performed by a welder or maintenance technician with the welding machine powered down and the wire feeder disabled. Allow the gun body to cool fully before handling consumables to avoid burns. Hand-tighten the nozzle onto the gooseneck threads — do not use pliers or wrenches on the nozzle body, as overtightening can deform the brass threads. Inspect the contact tip and liner condition whenever the nozzle is changed.

Technical Specifications

• Bore Diameter: 5/8 inch
• Duty Rating: Medium Duty
• Nozzle Style: Fixed Threaded
• Thread Material (Nozzle): Brass
• Thread Material (Gooseneck): Heat-Treated Stainless Steel
• Length: 2.25 inches
• Width: 1 inch
• Weight: 0.17 pounds
• Sold As: Each
• UPC: 608246434223

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1855