#8 x 3/4-16 (#8) Radius O-Ring Fitting

The #8 x 3/4-16 (#8) Radius O-Ring Fitting by FRAGOLA is a precision hydraulic and fuel line adapter engineered for high-performance automotive, aerospace, and industrial applications. This straight adapter connects two #8 AN male ports with O-ring face seal technology, eliminating the need for external sealing washers and delivering superior leak prevention in demanding systems. Purpose-built for professionals and enthusiasts who require reliable, repeatable connections under pressure and vibration, this fitting is an essential component in fuel injection systems, power steering circuits, and custom hydraulic networks.

Constructed from aluminum and finished in blue anodized coating, the #8 x 3/4-16 (#8) Radius O-Ring Fitting offers excellent corrosion resistance and weight savings without sacrificing strength. The radius O-ring design—featuring a precision-machined seat that cradles the elastomer seal—ensures superior contact pressure and eliminates micro-leakage even under thermal cycling and variable flow conditions. The 3/4-16 thread specification (JIC 37° flare compatible) and #8 AN nominal sizing allow direct integration into existing JIC and AN systems, while the anodized finish provides lasting durability and a professional appearance in engine bays and exposed installations.

This fitting is ideal for builders constructing fuel-injected engines, upgrading OEM hydraulic circuits, or assembling custom cooling and pressurized fluid networks where metal-to-metal seals are unacceptable. The straight male-to-male configuration accepts standard hose and tube adapters, making it a versatile integration point in modular line assemblies. Installation requires no special tools—simply hand-tighten until snug, then torque to specification with a wrench; the O-ring seal activates under system pressure, creating a fail-safe closure that resists blowout and vibration-induced loosening across temperature extremes from -40°F to +250°F.