997310 - ESAB ST-16/ST-21 MIG Gun Gas Nozzle #12M

Precision Gas Shielding for ST-Series Torches

The ESAB 997310 Nozzle (ST16/21 #12M) is a critical component designed to maintain the performance and reliability of classic ESAB, L-Tec, and Linde ST-16 and ST-21 MIG welding guns. In the realm of Gas Metal Arc Welding (GMAW), the nozzle plays a pivotal role in directing the shielding gas over the weld pool, protecting molten metal from atmospheric contamination such as oxygen and nitrogen. This specific nozzle is engineered to fit the unique geometry of the ST-16 and ST-21 front-end assemblies, ensuring a secure seal and concentric alignment with the contact tip.

Manufactured from a high-grade copper alloy, this nozzle offers exceptional thermal conductivity. During high-amperage welding, the front end of the MIG gun is subjected to intense radiant heat from the arc. The copper construction efficiently dissipates this heat, preventing the nozzle from overheating, deforming, or melting. This thermal management is essential not only for the longevity of the nozzle itself but also for protecting the internal insulator and gas diffuser components. The robust wall thickness further enhances durability, allowing the nozzle to withstand accidental impacts and the rigors of industrial environments.

Proper gas coverage is the primary defense against weld porosity. The ESAB 997310 features a precision-machined bore that promotes laminar gas flow, reducing turbulence that can draw in atmospheric air. Whether you are welding mild steel, stainless steel, or aluminum, consistent gas coverage is non-negotiable for achieving X-ray quality welds. This nozzle's design minimizes spatter adhesion, making it easier to clean and maintain during long welding shifts. By choosing genuine ESAB consumables, operators ensure that their equipment continues to function according to original factory specifications.

Technical Specifications & Performance

• Compatibility: Exclusively designed for ST-16 and ST-21 MIG guns.
• Material: High-conductivity copper alloy for superior heat rejection.
• Gas Flow: Optimized geometry for laminar shielding gas distribution.
• Durability: Heavy-duty construction resists mechanical damage and heat stress.