Oil Inlet Fitting 1/2NPT to -12 x 3in

The Oil Inlet Fitting 1/2NPT to -12 x 3in is a precision adapter engineered for high-performance engine oil system modifications and custom cooling circuit installations. This fitting bridges industry-standard NPT pipe thread ports to AN (Army-Navy) flange connections, making it indispensable for builders upgrading oil cooler lines, turbo feed systems, or auxiliary filtration rigs on street and race engines. Whether you're fabricating a complete custom oil circuit or integrating aftermarket cooling components, this adapter eliminates the need for multiple connection points and reduces potential leak paths in critical lubrication systems.

Constructed to handle sustained oil pressure while maintaining thread integrity, the Oil Inlet Fitting converts a 1/2-inch NPT (National Pipe Thread) male port—the standard on most factory engine blocks and pump housings—into a -12 AN (dash-12) female connection that accepts -12 hose or hard-line assemblies. The 3-inch overall length provides adequate clearance for adjacent components during engine bay layout, while the compact 1.25-inch cross-section allows installation in tight spaces common to modern engine compartments. AN fittings offer superior vibration resistance and leak-free performance under pressure cycling, critical when oil temperatures and flow rates fluctuate during spirited driving or racing conditions.

Professional engine builders, performance shops, and dedicated enthusiasts rely on this fitting for LS, small-block Chevy, Ford 5.0, and other platforms requiring aftermarket oil management. Compatible with synthetic and conventional oils, the fitting integrates seamlessly into turbo oil feed lines, remote filter heads, and custom radiator bypass circuits. Proper installation requires matching the NPT threads to engine ports with compatible sealant (PTFE tape or thread locker) and securing AN hose with appropriately sized crimp fittings or reusable hose ends. This adapter is a core component for any serious modifications that demand reliable, pressure-tested oil routing beyond OEM specifications.