Tweco 1240-1884 Heavy Duty Mig Nozzle 5/8 Inch Bore

Product Description

The TWECO 1240-1884 is a heavy duty MIG welding nozzle from the Velocity2a series, engineered for professional welders who demand reliable, low-maintenance consumables. Featuring a 5/8 inch bore, this nozzle uses a single-thread design that pairs brass threads on the replaceable nozzle against heat-treated stainless steel threads on the gooseneck. This soft-against-hard thread combination resists seizing and cross-threading — two of the most common failure points in standard MIG consumables. Licensed welding professionals and maintenance welders working in production or fabrication environments install this nozzle as a direct replacement on compatible Velocity-series MIG guns.

The 1240-1884 is suited for heavy duty MIG welding applications in both industrial and commercial settings. The Velocity2a series was developed to reduce tool dependency and thread complexity compared to conventional MIG consumables, which commonly use two or three thread sets. This nozzle is sold individually and is intended for use where consistent nozzle-to-contact-tip flushness and simplified no-tool changeouts are priorities on the shop floor or in the field.

Key Features

• 5/8 inch bore accommodates standard MIG welding wire and shielding gas flow requirements
• Single thread set reduces seizing and cross-threading compared to two- or three-thread conventional designs
• Brass nozzle threads mate against heat-treated stainless steel gooseneck threads for secure grip without loosening
• Heavy duty construction rated for demanding production and fabrication workloads
• No-tool changeout design speeds nozzle replacement and reduces downtime
• Velocity2a series design maintains a fixed, consistent flushness relationship between nozzle opening and contact tip

Compatibility

Designed as an OEM-style replacement nozzle for compatible TWECO Velocity-series MIG welding guns requiring a 5/8 inch bore heavy duty nozzle.

Installation Notes

Installation is performed by qualified welders or maintenance technicians. Disconnect and de-energize the MIG welding system before changing nozzle consumables. The Velocity2a design requires no tools for nozzle removal or installation — hand-tighten only to avoid overloading the brass threads. Inspect the gooseneck threads for spatter buildup before installing a replacement nozzle.

Technical Specifications

• Bore Size: 5/8 inch
• Series: Velocity2a Heavy Duty
• Thread Material (Nozzle): Brass
• Thread Material (Gooseneck): Heat-Treated Stainless Steel
• Weight: 0.14 pounds
• Length: 2.25 inches
• Width: 1 inch
• Sold As: Each

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1240-1884