169726 - Miller 169726 MIG Gun Nozzle, 5/8-inch Flush, Slip-On

Miller 169726 Flush Nozzle for M-25 and M-40 MIG Guns

The Miller 169726 is a genuine replacement MIG gun nozzle designed specifically for the M-25 and M-40 series MIG guns. Engineered by Miller Electric, this consumable component plays a critical role in shielding gas management and arc stability during the Gas Metal Arc Welding (GMAW) process. Featuring a 5/8-inch (16 mm) orifice, this nozzle provides a balanced gas envelope suitable for a wide range of welding amperages and wire diameters, making it a versatile choice for general fabrication and industrial welding tasks.

This specific model utilizes a "Flush" geometry. In this configuration, the contact tip sits approximately flush with the end of the nozzle. This design offers a distinct advantage in visibility and accessibility compared to recessed nozzles, allowing the welder to maneuver into tighter joints while maintaining a consistent stick-out. The flush profile is particularly beneficial when welding in short-circuit transfer mode or when the operator requires a clear line of sight to the weld puddle. It effectively focuses the shielding gas directly around the arc and molten pool, minimizing porosity and ensuring high-quality weld deposits.

Constructed from high-grade copper, the 169726 nozzle is built to withstand the intense heat of the welding arc. Copper's superior thermal conductivity helps dissipate heat rapidly, prolonging the life of the nozzle and reducing the adherence of weld spatter. The unit features a slip-on connection mechanism rather than a threaded interface. This slip-type design significantly reduces maintenance time; operators can quickly pull the nozzle off to clean spatter from the gas diffuser or replace the contact tip without the need for tools or unscrewing hot components. A built-in internal insulation ring (typically part of the gun assembly or nozzle base) ensures electrical isolation from the workpiece.

This nozzle is the standard equipment found on many of Miller's most popular integrated MIG runners, including the Millermatic 200, 210, 212, 250, 251, 252, and 300, as well as Vintage MIG welders equipped with the M-25 gun. It is essential for maintaining the performance specifications of these machines. Proper maintenance of the nozzle, including regular cleaning and the use of anti-spatter compounds, will ensure consistent gas flow and extend the service life of the consumable.