9/16-18 Banjo Bolt - Steel

The 9/16-18 Banjo Bolt - Steel is an essential hydraulic line fitting component designed for fuel, coolant, and brake system applications across modern and classic automotive builds. Built by FRAGOLA, a trusted name in performance plumbing, this banjo bolt serves as the critical connection point between high-pressure lines and engine block ports, making it indispensable for any mechanic upgrading fuel systems, cooling circuits, or brake assemblies. Whether you're installing a carbureted fuel system on a resto-mod or retrofitting hardlines on a track car, this fitting delivers the secure, leak-free junction your engine demands.

Machined from solid steel, the 9/16-18 Banjo Bolt features a 9/16-inch thread diameter with an 18 threads-per-inch pitch—a standard metric conversion used in fuel and coolant systems on everything from LS swaps to vintage muscle car restorations. The banjo design incorporates internal ports that allow fluid to flow from the main line into the bolt head, then distribute sideways into the engine block without any dead spots or turbulence-inducing elbows. Steel construction ensures durability under sustained pressure cycles, resisting galling and corrosion when paired with quality sealing washers, while the compact 4.15-inch length fits tight engine compartments without requiring adapter extensions.

Professional rebuilders and DIY enthusiasts choose FRAGOLA's 9/16-18 Banjo Bolt when precision matters—particularly on fuel-injected conversions, high-flow cooling upgrades, or any application where line pressure exceeds stock tolerances. Installation is straightforward: thread the bolt into the engine block port using appropriate torque specs for the application (typically 15–25 ft-lbs depending on material and thread sealant), sandwich your banjo line fitting between the bolt head and a steel sealing washer, then tighten the banjo bolt hand-tight plus one-quarter turn. Always verify thread compatibility with your specific engine block and confirm banjo line outer diameter matches your hardline gauge before purchase to avoid mismatches that compromise system integrity.