Adapter Fitting

The BORGESON adapter fitting (SKU BRG925123, MPN 925123) is a straight-through connector designed to join two matching male threads into a single unified line. This adapter fitting is essential for hydraulic systems, steering assemblies, fuel systems, and pneumatic applications where you need to bridge two identical port sizes without reducing flow or creating dead-end pockets. Whether you're rebuilding a classic vehicle's steering column, connecting aftermarket hydraulic components, or extending a fuel line run, this adapter fitting provides a clean, leak-free solution for professionals and enthusiasts alike.

Engineered from solid brass with a natural finish, this adapter fitting features a 5/8-18 inch male thread on both ends, allowing secure engagement with standard SAE ports found across most automotive and industrial equipment. Brass construction delivers excellent corrosion resistance, superior sealing integrity under pressure, and reliable machinability for custom installations. The straight-through design eliminates turbulence and pressure loss compared to elbow or tee alternatives, making it ideal for high-flow applications where maintaining system efficiency is critical. Precision threading ensures a positive, repeatable fit every time—no cross-threading or wobble.

This adapter fitting works best in restoration projects, performance modifications, and OEM replacement scenarios where two male-threaded components must be connected directly. Technicians favor brass adapters in fuel systems because brass will not spark or corrode under fuel exposure, and its malleability allows for hand-tight assembly without damaging fine threads. The compact 4 x 1.75 x 6 inch profile fits tight engine bays and cramped mechanical spaces. Always verify thread pitch and port size on your specific application before ordering—the 5/8-18 UNC specification is common in vintage American vehicles and modern industrial hydraulics, but confirm compatibility with your system documentation or parts diagram.