Our roll cage accessory mount, a product designed to allow you to easily mount small accessories to a roll cage tube, has a new size added: 1.625″ or 1-5/8″ size. This size is common among drag racers and some road racers, so we’ll be including it in our offerings. It is available now and in […]
FLF is proud to introduce a new way for wholesale dealers to sell FLF products. We understand that the large breadth of FLF products can make it difficult to sell online and the task of maintaining a website and order fulfillment can be a very tedious task. We’re here to help make things simple. Rather […]
New product at FLF! Our Heat Shrink Sealing Tubes help to seal our Heat Protection Sleeves against the fitting or other component, helping to prevent heat or other elements from entering the sleeve and helps to keep things in place. Available in 1-foot roll sizes for any project, with longer bulk rolls to be made […]
New for 2024, the Street Killer shirt features super soft cotton and lets you rock out with a sick R34 GT-R. Show off your JDM pride! Available in sizes from small to 2XL.
90 Degree Fuel Cell Bulkhead Installing a fuel cell bulkhead in a tight space? These can help make it a little easier to connect your fuel system’s AN fittings if you’re height restricted! AN Male Union with 1/8″ NPT Port Adapter45 & 90 Degree Angles Now Available New for our AN Union adapters featuring an […]
G-thread (from Gas or Gewinde) is a 55 degree parallel pipe thread. These can have male or female thread and o-rings can be used for low pressure lines under static load. G-threads are NOT compatible with NPS, nor are they compatible with any tapered thread such as NPT or BSPT. The angle, shape, and thread-pitch […]
Dry break quick disconnect and fittings are vital components in motorsport applications. They allow for quick and easy fuel and oil changes during pit stops, reducing the amount of time spent in the pit lane and increasing the team’s chances of winning. But what exactly are they, and how do they work? Dry break quick […]
In motorsports, having a reliable fuel system is crucial for performance and safety. One of the most important components in the fuel system is the fuel filter. A fuel filter’s main function is to remove any impurities, such as dirt, rust, and debris, from the fuel before it enters the engine. This helps to protect […]
NPT fittings, also known as National Pipe Thread fittings, are a type of fitting commonly used in industrial, automotive, and plumbing applications. They are designed to provide a secure, leak-free connection for fluid and gas systems, and are known for their durability and versatility. NPT fittings are designed to connect to pipes or hoses that […]
AN fittings, also known as Army-Navy fittings, are a type of fitting used in high-performance automotive and racing applications. They are designed to provide a secure, leak-free connection for fuel, oil, and other fluid systems, and are popular among car enthusiasts for their strength, durability, and versatility. One of the main advantages of AN fittings […]
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TECHNICAL GUIDE
AN Thread & Hose Sizing Reference
AN (Army-Navy) thread sizes are the motorsport standard for high-pressure fuel, oil, and coolant plumbing. Use this quick reference to select matching fittings, hose sizes, and adapters for your build.
AN Size
Hose ID / Tube O.D.
Thread Size (SAE)
Typical Track Applications
-4AN
1/4 inch
7/16-20
Fuel return, turbo oil feed, nitrous
-6AN
3/8 inch
9/16-18
Primary fuel EFI feed/return, trans coolers, power steering
-8AN
1/2 inch
3/4-16
High HP fuel, oil coolers, power steering
-10AN
5/8 inch
7/8-14
Remote oil filter, turbo drains, breather lines, very high HP fuel systems
-12AN
3/4 inch
1-1/16-12
Large dry sump oil lines, supercharger coolant systems, extreme HP fuel systems
-16AN
1 inch
1-5/16-12
Radiator coolant hoses, high volume dry sump, extreme alcohol-fueled engines
-20AN
1-1/4 inch
1-5/8-12
Large radiator coolant lines, high-capacity dry sump scavenge
Need custom plumbing advice for your turbo, dry sump, or fuel cell? Call our track support team at (866) RACE-561.
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