598721 - ESAB PSF Series Gas Nozzle 16mm Conical (Pack of 2)

Technical Overview of the ESAB 598721 Gas Nozzle

The ESAB 598721 is a high-performance gas nozzle designed specifically for the PSF series of MIG/MAG welding torches. This component is critical for directing shielding gas around the weld pool, protecting it from atmospheric contamination such as oxygen and nitrogen which can cause porosity and brittle welds. The nozzle features a standard 16mm bore diameter, which is the most versatile size for general fabrication, offering a balance between gas coverage and accessibility into tighter joints.

Manufactured from a robust copper alloy, this nozzle is engineered to withstand the high thermal loads associated with industrial welding processes. The conical geometry is optimized to facilitate laminar gas flow, ensuring a stable shield even at higher amperages. This specific part number (often referenced as 0459872101) is the standard fitment for a wide range of ESAB guns, including the PSF 250, PSF 305, PSF 405, and PSF 505 models. Its design also incorporates features to minimize spatter adhesion, making cleaning and maintenance more efficient during prolonged welding sessions.

In industrial MRO contexts, maintaining a stock of genuine consumables like the 598721 is essential for minimizing downtime. Worn or deformed nozzles can lead to turbulent gas flow, resulting in weld defects that require costly rework. This pack contains two nozzles, ensuring that operators have immediate replacements available. The precise machining of the mating surfaces ensures a secure fit onto the torch neck or gas diffuser, preventing gas leaks that could compromise the weld quality or waste expensive shielding gas.

Key technical specifications include:

• Bore Diameter: 16mm (Standard)


• Geometry: Conical / Tapered


• Material: High-conductivity Copper Alloy


• Compatibility: ESAB PSF Series (Air and Water Cooled)