Straight Adapter Fitting #4 x 1/8 MPT

The Straight Adapter Fitting #4 x 1/8 MPT by FRAGOLA is a precision hydraulic adapter designed to connect AN-sized tubing to NPT (National Pipe Thread) port systems. This fitting serves hydraulic, pneumatic, and fuel delivery applications where a direct connection between two different thread standards is required. Whether you're building a custom fuel system, upgrading brake lines, or assembling high-performance hydraulic circuits, this adapter eliminates the need for multiple intermediate fittings and reduces potential leak points.

Constructed from lightweight aluminum with blue anodized finish for corrosion resistance, the straight adapter maintains structural integrity while resisting oxidation in demanding environments. The #4 AN (1/4-inch) male port accepts standard -4 hose and hard-line tubing, while the 1/8-inch male NPT thread accommodates common industrial and aftermarket ports found on gauges, blocks, and valve manifolds. The straight configuration allows for clean, space-efficient routing in tight engine bays and compartments. FRAGOLA's precision engineering ensures proper sealing with standard AN or NPT-compatible sealing compounds, providing reliable performance under pressure without thread stripping or leakage.

This adapter is ideal for custom fuel systems, supercharger kits, differential coolers, transmission line modifications, and any application requiring AN-to-NPT compatibility. Installation is straightforward: apply appropriate thread sealant (PTFE tape or aviation-grade sealant) to the NPT end, hand-start the fitting, and torque to specification using standard wrenches. The compact 0.01 lb weight makes it suitable for weight-conscious builds without sacrificing reliability. Compatible with all standard -4 AN hose, hard lines, and fittings across automotive, motorsport, and industrial hydraulic systems.