57N74 - 57N74 Large Diameter Alumina Gas Lens Cup #8 (10-Pack)

Technical Overview of the 57N74 Large Diameter Gas Lens Nozzle

The Generic 57N74 Large Diameter Alumina Gas Lens Nozzle is a critical consumable for TIG welding applications requiring enhanced shielding gas coverage and superior arc stability. Manufactured from high-grade alumina ceramic, this nozzle is engineered to withstand the extreme thermal shock and high temperatures associated with continuous GTAW processes. The nozzle features a #8 orifice, corresponding to a 1/2-inch (12.7mm) bore diameter, which is optimized for medium-to-heavy duty welding tasks where a broader gas envelope is necessary to protect the weld pool from atmospheric contamination.

This specific nozzle is designed to interface exclusively with Large Diameter Gas Lens Collet Bodies. Unlike standard collet bodies which create turbulent gas flow, the gas lens system utilizes a multi-layer mesh screen to organize the shielding gas into a laminar column. The 57N74 nozzle acts as the conduit for this streamlined flow, significantly reducing turbulence and allowing the welder to extend the tungsten electrode further—up to an inch or more—without compromising shield integrity. This capability is essential for accessing deep joints, corners, and confined spaces found in pipe welding, aerospace fabrication, and precision industrial repair.

Compatibility is extensive; the 57N74 fits standard 17, 18, and 26 series torches when equipped with the appropriate large gas lens setup. It is also compatible with 9 and 20 series torches if the user employs the specific large diameter gas lens adapter kit. The alumina material offers excellent dielectric strength and resists the adhesion of weld spatter, ensuring a longer service life compared to lower-grade ceramics. With a standard length of approximately 1-7/8 inches (48mm), it provides a balance of reach and maneuverability. This product is supplied as a package of 10, ensuring a consistent supply for production environments.