The AN thread might not be the first thing that comes to mind when you're trying to recall different types of threads, especially if you're woken up at 3 a.m. But for those in certain industries, it's more than just a technical detail—it's a critical component. If you're a mechanic, an engineer, or someone working with high-performance systems, you might one day come across the **AN thread**. While it may not be part of your everyday work, understanding what it is and how it works can make all the difference.
So where does the AN thread come from? It's distinctly American, developed during World War II by the **Army Air Corps and Navy**—hence the "AN" in its name. Originally designed for use in military and aerospace applications, the AN thread was created to handle heavy-duty connections under extreme conditions. Over time, its use has expanded beyond the military into various industrial and automotive sectors, particularly in areas like **motorsport** and **high-pressure fluid systems**.
One of the key features of the AN thread is that it's used for **flared fittings**, which are commonly found in systems where flexibility and strength are essential. These fittings are ideal for connecting **flexible hoses to rigid pipes**, and they’re built to withstand **vibration, high pressure, and heavy loads**. The unique design relies on a **37° cone angle**, which ensures a secure and leak-proof connection when the nut is tightened.
When it comes to sizing, AN threads are labeled using **dash numbers** (like -2, -6, -10, etc.). This system is based on the **outer diameter** of the fitting, measured in sixteenths of an inch. For example, a 5/8-inch outer diameter becomes a **-10** AN thread. While this might seem confusing at first, it’s actually a standardized way to identify and match components quickly.
Another important point is that the **inner diameter** of the hose or pipe can vary depending on the material and application. That’s why there’s a separate designation system for the **actual thread size**—it helps ensure compatibility between parts. So while an **AN6** might fit into a **-6** AN thread, the actual dimensions could differ slightly.
You’ll find AN threads most commonly in **aerospace**, **automotive**, and **motorsport** applications. In the U.S., they’re still widely used in industrial settings, while in Europe, they’re more familiar in performance car builds and racing environments. Whether you're installing fuel lines, brake systems, or hydraulic components, AN threads offer a reliable and durable solution.
But are there alternatives? Yes, there are. The **SAE flare fitting** is similar in size but uses a **45° cone angle**, which means it's not interchangeable with AN threads. Mixing them could lead to leaks or failures. However, the **JIC flare fitting** is a closer match, as it also uses a **37° angle** and is generally compatible with AN threads. Still, even with a perfect fit, some applications—especially in **aviation**—may require strict adherence to specific standards.
If you're looking for tools or components that support AN threads, you'll find a wide range available online. From **adapters** to **connectors**, there's something for every need. And if you have any questions, our customer service team is always ready to help.
Whether you're a professional or a hobbyist, knowing about the AN thread can open up new possibilities in your projects. So next time you see a dash number or a 37° flared fitting, you’ll know exactly what it is—and why it matters.
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