4an x 9/16-18 Brake Adapter Fitting Steel

The 4AN x 9/16-18 Brake Adapter Fitting Steel from FRAGOLA is an essential component for custom brake system builds and modifications where hose-to-hardline transitions demand reliable performance. This adapter fitting bridges the gap between -4 AN hose assemblies and 9/16-18 threaded ports commonly found on master cylinders, proportioning valves, and brake distribution blocks.

Constructed from durable steel, this adapter fitting provides reliable performance under repeated brake cycling and thermal cycling conditions. The 9/16-18 thread pitch is the industry standard for many OEM and aftermarket brake system components, ensuring compatibility with a wide range of valve and cylinder designs. The -4 AN port accepts standard AN hose fittings with JIC 37-degree flare ends, creating leak-free connections that meet or exceed SAE standards for automotive hydraulic systems.

Mechanics and fabricators building custom brake systems for street rods, race cars, or classic muscle cars will benefit from this fitting's precision manufacturing, which ensures tight tolerances and consistent thread engagement. This is critical for safety-critical brake systems, making it a reliable choice for high-performance and street applications.