-6an to 1/4 NPSM Fitting Transmission

The -6AN to 1/4 NPSM Fitting Transmission from RUSSELL is an essential adapter for builders upgrading transmission fluid lines in high-performance and modified vehicles. This fitting bridges the gap between modern -6 AN hose standards and legacy 1/4-inch NPSM (National Pipe Straight Mechanical) threaded ports found on many transmission coolers, cooler lines, and factory transmission housings.

Whether you're retrofitting a classic muscle car with modern cooling efficiency or adapting an engine swap's transmission oil circuit, this adapter eliminates guesswork and ensures a proper seal where mismatched port sizes would otherwise compromise fluid flow or create leaks. RUSSELL fittings are precision-engineered from high-quality materials with consistent thread pitch and sealing geometry that withstand transmission fluid pressure cycles and thermal expansion.

The -6AN side accepts standard braided stainless or rubber transmission hose with JIC 37-degree flare connections, while the 1/4 NPSM port threads directly into factory or aftermarket transmission components without requiring additional adapters. This fitting serves transmission builders, engine swap specialists, and performance enthusiasts upgrading cooling systems in tight engine bays and transmission tunnel spaces common in modified vehicles.