169-725 - Miller Style Replacement MIG Nozzle, 5/8 in. Orifice, 1/8 in. Recessed

Product Overview

The Miller Style Replacement MIG Nozzle (Part Number 169725) is a high-performance consumable designed to meet the rigorous demands of industrial welding environments. Engineered as a direct replacement for the OEM Miller 169725 nozzle, this component is compatible with the widely used M-Series MIG guns, specifically the M-25 (rated at 250 Amps) and the M-40 (rated at 400 Amps). These guns are standard equipment on a vast range of Millermatic power sources, making this nozzle a versatile addition to any maintenance, repair, or fabrication inventory.

Constructed from high-grade copper alloy, this nozzle is built to withstand the intense heat cycles associated with MIG (GMAW) welding. The material ensures excellent thermal conductivity, helping to dissipate heat away from the front end of the gun, thereby prolonging the life of the contact tip and the nozzle itself. The unit features a standard 5/8-inch (15.9 mm) orifice, which provides a broad and stable column of shielding gas, essential for preventing atmospheric contamination and porosity in the weld pool. This bore size is ideal for medium to heavy-duty applications where higher amperages and larger wire diameters are utilized.

A key technical feature of this nozzle is its 1/8-inch (3.2 mm) contact tip recess. By positioning the contact tip slightly back from the nozzle opening, the design helps to protect the tip from direct arc heat and reduces the likelihood of short-circuiting against the workpiece. This recess also aids in minimizing spatter adherence to the tip face, ensuring smoother wire feeding and less downtime for cleaning. The nozzle utilizes a slip-on connection mechanism, designed to fit precisely over the 169729 nozzle adapter/retainer. This friction-fit design eliminates the need for threads, allowing for rapid removal and installation during consumable changes or routine cleaning.

This nozzle is also compatible with Hobart H-Series MIG guns, further expanding its utility in mixed-fleet workshops. Whether used for structural steel fabrication, automotive repair, or general manufacturing, this Miller-style nozzle delivers consistent gas coverage and reliable durability.