8696 - B-Size Oxygen Male to 1/2 Inch NPT Male Brass Adapter

Technical Overview of the ESAB 8696 Brass Adapter

The ESAB 8696 is a specialized gas service adapter designed to facilitate the connection between standard oxy-fuel welding equipment and rigid piping systems. This component is precision-machined from high-quality brass, a material selected for its excellent corrosion resistance, non-sparking properties, and compatibility with oxygen service. The adapter features two distinct connection interfaces: a B-Size Oxygen Male thread and a 1/2-inch National Pipe Taper (NPT) Male thread. This configuration is critical for integrating flexible hoses or regulators into fixed manifold systems or station drops.

The B-Size Oxygen connection utilizes a standard 9/16"-18 Right-Hand (RH) thread profile, which is the industry standard for oxygen service in North America (CGA 022). This side of the adapter is designed to mate with B-Size Oxygen Female swivel nuts found on hoses or regulator outlets. The sealing mechanism on this side typically relies on the mechanical seating of the mating nipple against the internal surface of the adapter or the compression of the swivel connection, ensuring a gas-tight seal without the need for thread sealant on the straight threads.

On the opposing end, the 1/2" NPT Male thread provides a tapered interface suitable for screwing into 1/2" NPT Female ports found on pipe fittings, valves, or manifold blocks. The tapered nature of NPT threads requires the deformation of the threads during tightening to create a seal, often supplemented by an oxygen-compatible thread sealant or PTFE tape (specifically rated for oxygen use) to fill helical leak paths. The hexagonal body of the adapter allows for the application of torque using standard wrenches, ensuring secure installation without damaging the threads.

This component is cleaned for oxygen service during manufacturing, a crucial process that removes all traces of oils, greases, and combustible contaminants that could react violently in a high-pressure oxygen environment. It is rated for standard industrial gas welding pressures, typically up to 200 PSIG for distribution lines, though the brass material itself can withstand significantly higher pressures depending on the mating components and temperature conditions. The ESAB 8696 is an essential component for facility maintenance, gas distribution system fabrication, and custom equipment setups where transitioning from rigid pipe to flexible welding gear is required.