Understanding AN Fittings and Why They Matter in Performance Builds

When it comes to building or maintaining a high-performance engine, reliability in every connection counts — especially in your fuel, oil, and coolant systems. That’s where AN fittings come in. At Fastime Performance in Taylor, Michigan, we supply quality AN fittings and hoses to help racers and performance builders achieve leak-free, professional-grade results.

What Are AN Fittings?

The term “AN” stands for “Army-Navy,” a standardized fitting system originally developed for military aircraft. Today, AN fittings are widely used in motorsports and custom automotive builds because they provide a reliable, reusable, and leak-proof connection between hoses and components. They come in multiple sizes, commonly ranging from AN-4 to AN-16, to fit different fluid flow needs.

Why Use AN Fittings?

AN fittings are designed for both strength and serviceability. Unlike standard hose clamps, they use a flared seat and threaded design that forms a tight mechanical seal. This prevents leaks even under high pressure and temperature — ideal for fuel delivery, oil lines, and cooling systems. They also allow for easy disassembly and reuse, making maintenance and upgrades simple.

Material and Finish Options

Most AN fittings are made from lightweight aluminum with anodized finishes that resist corrosion and add a clean, professional look to your engine bay. For higher stress or specialty applications, stainless steel options provide even greater durability. We carry a range of both straight and angled fittings to help route lines neatly in tight engine compartments.

Choosing the Right AN Fittings for Your Build

Choosing the correct size and hose type is key to achieving a secure seal. Fuel systems, for example, often use AN-6 or AN-8 fittings, while oil and coolant lines may require AN-10 or AN-12. Our team at Fastime Performance can help you select the right fittings, hoses, and adapters to match your system and flow requirements.

Shop AN Fittings in Taylor, Michigan

We stock AN fittings, braided hoses, adapters, and accessories from leading brands trusted by racers and builders. Whether you’re plumbing a new fuel system, adding an oil cooler, or replacing worn lines, we have the parts and knowledge to help you get it right the first time.

Visit Fastime Performance in Taylor, MI or call (734) 947-1600 to find the right AN fittings for your project. Our performance parts store and engine machine shop serve the entire Detroit and Downriver Michigan area.