12401854 - Tweco VNM-62 Velocity Nozzle 5/8 Bore 1/8 Recess (2-Pack)

Technical Innovation in MIG Consumables

The Tweco Velocity2 VNM-62 MIG Nozzle (SKU: 1240-1854) represents a significant advancement in gas metal arc welding (GMAW) consumable technology. Engineered specifically for the Tweco Spray Master series of MIG guns, this nozzle is an integral component of the Velocity consumable platform, designed to optimize arc stability, thermal management, and operational efficiency. The VNM-62 features a 5/8-inch (16mm) bore orifice, the industry standard for medium-duty applications, providing a balanced flow of shielding gas to protect the weld pool from atmospheric contamination.

A defining characteristic of the Velocity2 series is its streamlined mechanical design. Traditional MIG consumables often rely on multiple threaded connections—between the diffuser, tip, and nozzle—which can introduce electrical resistance and thermal bottlenecks. The Velocity system simplifies this by utilizing a single thread engagement point. The VNM-62 nozzle employs precision-machined brass threads that mate with the conductor tube's stainless steel threads. This bi-metallic coupling is tribologically engineered to prevent galling and seizing, a common failure mode in high-heat welding environments. The brass material is softer, allowing it to grip the harder stainless steel securely without fusing, ensuring that the nozzle remains easy to remove even after prolonged welding sessions at high amperages.

The nozzle is rated for welding outputs up to 250 Amps, making it suitable for light to medium industrial fabrication. It features a 1/8-inch (3.2mm) tip recess. This recessed geometry is critical for short-circuit MIG welding, as it helps protect the contact tip from excessive spatter accumulation and radiant heat, thereby extending the lifespan of the consumable stack. Furthermore, the VNM-62 is self-insulated, incorporating high-temperature dielectric materials directly into the nozzle body. This eliminates the need for a separate, fragile insulator component, reducing inventory complexity and the likelihood of assembly errors. The solid copper construction of the nozzle body ensures efficient heat dissipation, drawing thermal energy away from the front end to maintain cooler operating temperatures and consistent electrical conductivity.