#4 to 7/16-20 Steel Adapter

The #4 to 7/16-20 Steel Adapter is a precision hydraulic and pneumatic fitting designed to bridge incompatible port sizes in fluid power systems. This adapter converts a #4 AN (Army-Navy) male port to a 7/16-20 inch male thread configuration, making it essential for technicians, mechanics, and engineers who need reliable connections across mixed port standards. Whether upgrading brake lines, fuel systems, or custom hydraulic assemblies, this straight adapter eliminates the need for costly component replacement and ensures secure, leak-free operation in demanding environments.

Constructed from steel with cadmium plating, the #4 to 7/16-20 Steel Adapter delivers superior corrosion resistance and durability in both industrial and automotive applications. The straight design minimizes turbulence and pressure loss, critical for maintaining system efficiency and preventing fluid degradation. The integral crush washer creates a metal-to-metal seal that withstands high pressure and thermal cycling without requiring additional sealing tape or compounds. This one-piece construction reduces assembly complexity and the risk of contamination from external sealants.

Technicians working on vintage or custom hydraulic systems, heavy equipment, and performance automotive builds will find this adapter invaluable for retrofitting or cross-platform connections. Its compact footprint (2.85 x 0.6 x 4.65 inches) allows installation in tight spaces where larger manifolds cannot fit. The cadmium finish protects against rust and oxidation in salt-spray or humid environments, extending service life and maintaining system integrity. Installation is straightforward: hand-tighten the crush washer seal, then torque to specification—no special tools or expertise required for reliable, repeatable results.