12401856 - Tweco VNM-50F Velocity2 MIG Nozzle 1/2-Inch Flush (2-Pack)

Technical Overview of Tweco Velocity2 VNM-50F Nozzles

The Tweco Velocity2 VNM-50F MIG Nozzle is a specialized consumable component engineered for the Velocity™ platform, identified by manufacturer part number 1240-1856. This nozzle features a 1/2-inch (12.7mm) bore diameter and a flush tip relationship, specifications that are critical for maintaining arc stability and gas coverage in medium-duty applications. Rated for welding outputs up to 250 Amps, the VNM-50F is specifically designed to interface with Tweco Spray Master™ MIG guns that utilize the Velocity consumable system. The nozzle's architecture is integral to the Velocity system's performance, working in tandem with VTM series contact tips to optimize electrical conductivity and thermal dynamics.

A defining technical feature of the Velocity2 series is its departure from traditional threaded contact tip designs. The VNM-50F nozzle acts as the retaining mechanism for the contact tip, utilizing a "drop-in" style that eliminates the need for threads on the tip itself. This design choice significantly reduces electrical resistance at the connection points, fostering a more stable arc and reducing heat generation at the front end. The nozzle is constructed from high-grade copper alloy to maximize heat dissipation, while its self-insulated body prevents electrical shorting against the workpiece, a vital safety and performance feature in tight welding environments.

Detailed Specifications:

• Model Designation: VNM-50F (Velocity Nozzle Medium - 50 Flush)
• Bore Geometry: 1/2" (12.7 mm) cylindrical bore
• Contact Tip Relationship: Flush (Tip is level with nozzle exit)
• Current Capacity: 250 Amps maximum output
• Insulation Type: Integrated Self-Insulation
• System Compatibility: Tweco Spray Master with Velocity Consumables

The flush tip relationship offered by the VNM-50F provides a balanced operational window for the welder. It allows for sufficient wire stick-out visibility without compromising the shielding gas envelope, which is crucial for preventing porosity and atmospheric contamination of the weld pool. The 1/2-inch bore size creates a focused column of shielding gas, ideal for standard wire diameters used in the 250A range. By integrating the insulation directly into the nozzle structure, Tweco eliminates the need for separate insulators, thereby reducing the total part count of the gun assembly and simplifying inventory management for industrial operations. This nozzle represents a convergence of thermal efficiency, mechanical simplicity, and electrical performance.