33A58 - ESAB 33A58 Brass Extension Nut .562-18 Thread

Technical Overview of the ESAB 33A58 Extension Nut

The ESAB 33A58 is a specialized extension nut designed for use in industrial gas apparatus, specifically within oxy-fuel welding and cutting setups. Manufactured from high-grade brass, this component is engineered to withstand the mechanical stresses and pressure requirements typical of compressed gas service. The nut features a specific thread pitch of .562-18 (often referenced as 9/16"-18), which is a standard dimension for various regulator connections and torch fittings within the ESAB, Oxweld, and Purox product lines.

In gas distribution systems, the integrity of every connection is paramount to safety and operational efficiency. The 33A58 serves as a critical interface component, often used to extend the reach of a connection point on a regulator body or manifold, allowing for proper clearance when attaching hoses or other fittings. Its hexagonal exterior is machined to standard wrench sizes, facilitating proper torque application without rounding the edges. The internal threads are cut to tight tolerances to ensure smooth engagement with mating parts, minimizing the risk of cross-threading or galling, which can compromise the seal.

As an OEM replacement part, the ESAB 33A58 guarantees material compliance with industry standards for oxygen and fuel gas service. Brass is the material of choice due to its non-sparking properties and resistance to oxidation, which is critical when handling oxygen at high pressures. Using non-OEM fittings in such applications can lead to dimensional mismatches or material failures. This extension nut is supplied individually and is an essential stock item for maintenance personnel responsible for the repair and upkeep of gas regulation equipment.

Installation of this component should be performed by qualified personnel familiar with gas apparatus repair. Ensure that all mating surfaces are clean and free of oil or grease, particularly for oxygen service applications. The 33A58 is designed to provide a metal-to-metal seal or work in conjunction with specific seating surfaces, depending on the exact assembly configuration. Regular inspection of such fittings for thread wear or physical damage is recommended during routine equipment maintenance intervals.