KP4121-1-62S-B25 - Lincoln Electric Magnum PRO Robotic Nozzle, 5/8" Bottleneck, Stickout, Water-Cooled (25 Pack)

Technical Overview of the Lincoln Electric KP4121-1-62S-B25

The Lincoln Electric KP4121-1-62S-B25 is a specialized gas nozzle engineered for the rigorous demands of automated welding environments. Part of the Magnum PRO consumable line, this nozzle is specifically designed for use with Magnum PRO Water-Cooled Robotic Torches. The component features a bottleneck geometry, which tapers towards the orifice to facilitate access into restricted spaces and tight joint configurations often encountered in complex robotic weld paths. The nozzle bore diameter is 0.625 inches (15.9 mm), a standard size that balances gas flow velocity and coverage area for typical solid and flux-cored wire applications.

This specific model utilizes a "Stick Out" contact tip relationship. In this configuration, the contact tip protrudes slightly beyond the nozzle exit (typically 1/8 inch), which can be advantageous for arc visibility and specific electrical stick-out requirements in automated setups. The nozzle employs a thread-on connection mechanism. Unlike slip-on nozzles, the threaded interface ensures a mechanically positive lock that prevents the nozzle from vibrating loose during the high-acceleration movements characteristic of modern robotic arms. Furthermore, the threaded connection enhances thermal conductivity, allowing heat to dissipate more effectively from the nozzle into the torch neck and cooling system.

Constructed to withstand high-amperage, high-duty-cycle operations, the KP4121-1-62S-B25 is integral to maintaining consistent weld quality in water-cooled systems. The water-cooled torch design actively removes heat from the front-end consumables, and this nozzle is built to interface correctly with that thermal management system. Supplied in a bulk pack of 25, this SKU is intended for high-volume industrial users requiring reliable, repeatable performance to minimize downtime associated with consumable changeovers.