What Are Hydraulic AN Fittings Used For?
Hydraulic AN fittings are used to create secure, leak-free connections in fluid transfer systems. They are commonly found in fuel systems, oil systems, coolant circuits, power steering systems, and other performance applications where reliability is critical.
"AN" actually stands for Army-Navy - a result of a joint venture between those two U.S. military groups to create uniform specifications for leak-proof fluid lines and hardware for military vehicles and aircraft.
Since the AN sizing system is standardized, it allows components from different manufacturers to be combined and used together while maintaining consistent fitment and sealing characteristics.
Why Should I Use AN Fittings for My Engine Build?
AN fittings provide a durable, serviceable, and professional solution for fluid routing. Yes, it is generally the more expensive, but for high performance builds and important fluids that has to reduce the chances of a connection failure, most builders opt for AN lines.
Compared to conventional hose barb connections, AN fittings offer improved sealing, higher pressure capability, and easier maintenance. They are widely used in motorsport and high-performance vehicles where reliability, safety, and clean installation are essential.
In addition, AN connections allow components to be disconnected and reassembled while risking less damage to the connections.
Why Is BOOST Products the Best Manufacturer of Hydraulic AN Fittings?
BOOST Products AN fittings are engineered for demanding motorsport and performance applications.
Manufactured from high-quality aluminium and CNC-machined for precise fitment, they provide reliable sealing, excellent durability, and a professional appearance. A comprehensive product range allows complete systems to be built using matching components, ensuring compatibility and consistent quality throughout the installation.
Whether used for fuel, oil, coolant, or hydraulic systems, BOOST Products AN fittings are designed to deliver reliable performance under demanding conditions.
What Types, Sizes and Colors of Hydraulic AN Fittings Are Available?
BOOST Products offers a comprehensive range of AN fittings, including straight, 45°, 90°, and specialized adapters such as dry break fittings.
Fittings are available in multiple AN sizes to support everything from small sensor and fuel lines to large oil and coolant systems. Depending on the product line, fittings are available in various finishes and colors to match different engine bay designs and fabrication requirements.
What's Important to Know About Hydraulic AN Fittings?
There is actually a calculation involved when determining AN sizes.
AN Size = Diameter (inches) x 16
Therefore, the resulting calculation for the AN size needed for a 3/8" hose inner diameter yields 3/8 x 16 = 6, so you'd need a -06 AN line!
Selecting the correct AN size and fitting type is essential for proper system performance. In the automotive industry, we simply refer to AN lines as "Dash (line size) line". So if you're looking for a -06 AN fitting, you would just say "Dash 6 fitting". Anyone in the industry would know "Dash" always refers to AN lines.
The fitting must match both the hose size and the intended fluid flow requirements. Choosing fittings that are too small may restrict flow, while incorrect assembly can lead to leaks or premature wear. Here is a guide for some of the common AN sizes you may come across.
| AN Size | Hose ID or Tube OD | SAE Thread Size |
| -02 | 1/8" | 5/16" -24 |
| -03 | 3/16" | 3/8" -24 |
| -04 | 1/4" | 7/16" -20 |
| -05 | 5/16" | 1/2" -20 |
| -06 | 3/8" | 9/16" -18 |
| -08 | 1/2" | 3/4" -16 |
| -10 | 5/8" | 7/8" - 14 |
| -12 | 3/4" | 1 1/16" -12 |
| -16 | 1" | 1 5/16" -12 |
| -20 | 1 1/4" | 1 5/8" -12 |
| -24 | 1 3/4" | 1 7/8" -12 |
For best results, always use compatible components and ensure that fittings are installed correctly according to the application requirements.
