#4 x 7/16-20 (#4) Radius O-Ring Fitting Black

The #4 x 7/16-20 (#4) Radius O-Ring Fitting Black is a precision hydraulic and pneumatic adapter designed for professionals who demand reliability in fluid transfer systems. This fitting is essential for applications requiring secure, leak-free connections, particularly in custom hydraulic builds. Built by FRAGOLA, a trusted manufacturer in the fluid transfer industry, this fitting serves motorsports enthusiasts and industrial technicians.

Engineered from aluminum and finished with a black anodized coating, the #4 x 7/16-20 fitting utilizes an O-ring seal design that eliminates the need for thread-sealing tape or paste. This design provides superior vibration resistance and reduces the risk of connection failure. The radius O-ring design distributes sealing pressure evenly across the connection face, preventing galling and ensuring consistent performance across pressure cycles.

Ideal for drag racers, hot rodders, and custom builders, this fitting is particularly suited for integrating or repairing fuel, oil, or coolant systems where AN connections are the gold standard. Its anodized aluminum construction balances lightweight durability with corrosion resistance, making it suitable for both engine bay and exposed outdoor installations.