The number represents the OD (Outside Diameter) of the tube the fitting was designed to fit in the old AN specifications. The number represents the OD as multiples of 1/16”. Therefore, a -10 fitting was originally designed to fit an solid tube with an OD of 10 * 1/16″ = ⅝″ (~16mm). Conical Seat Angle ¶

AN fittings are designed to provide leak-free connections, ensuring that fluids or gases are contained within the system. This is particularly important in applications where the safety of the system or the environment is a concern. Durability One of the most important aspects of AN fittings is understanding the sizing. AN fittings are available in a range of sizes, each with a unique designation. The size of an AN fitting is indicated by two numbers separated by a dash, such as “AN6” or “AN8.” The first number refers to the size of the fitting, while the second number refers to the thread size. AN sizes are shown as a size number prefixed with a hyphen, so a -10 fitting would be called a “Dash 10″ AN fitting.With proper installation and maintenance, AN fittings provide a reliable and long-lasting solution for fluid transfer in automotive, aerospace, and industrial applications. What are SAE Fittings?

A new standard was introduced to clean up the confusion called the JIC (Joint Industries Council) fitting standard. These JIC hydraulic fittings have a slightly lower class of thread quality and are considerably less expensive than their AN counterparts. AN fitting sizes and JIC fitting sizes are comparable. JIC fittings are now defined by standard SAE J514 of the Society of Automotive Engineers (SAE). Differences between AN and JIC fittings SAE fittings are typically made of steel and have a 45-degree flare, making them well-suited for use in systems that don’t experience high levels of stress or pressure. AN Fittings vs SAE Fittings: Key DifferencesOn SAE 37° Flare fittings, the male and female threads are made according to class 2A/2B UN/UNF series threads. Fastener classes 2A and 2B are designed for optimum thread fit that balances fastener performance, manufacturing, economy, and convenience. The terms AN and JIC are used interchangeably in aftermarket automotive hydraulic systems. Mainly the system is used for fuel and oil systems. Occasionally it is also used for coolant systems, but it is pretty rare. What we’re after in reality are AN fittings, because they offer the best dimensional tolerances, and sealing surface finishes. Not all fittings that look the same, are the same! In Motorsport ¶ SAE fittings are commonly used in traditional automotive applications, such as in brake and fuel systems. They can also be found in older vehicles and in some industrial applications that do not require the high performance capabilities of AN fittings.