Speedflow AN/JIC Fittings Size Guide

View AN/JIC Size Guide

AN/JIC FITTINGS - QUICK REFERENCE GUIDE

AN/JIC FITTING & TUBE INFORMATION

Dash Size	Braided Hose I.D.	Hard Tube O.D.	AN/JIC Thread	AN Flare Bore Size	AN/JIC Wire Nut Hex
-3	1/8"	3/16"	3/8" x 24	0.125"	7/16" or 1/2"
-4	7/32"	1/4"	7/16" x 20	0.171"	9/16"
-6	11/32"	3/8"	9/16" x 18	0.298"	11/16"
-8	7/16"	1/2"	3/4" x 16	0.391"	7/8"
-10	9/16"	5/8"	7/8" x 14	0.484"	1"
-12	11/16"	3/4"	1-1/16" x 12	0.608"	1-1/4"
-16	7/8"	1"	1-5/16" x 12	0.844"	1-1/2"
-20	1-1/8"	1-1/4"	1-5/8" x 12	1.078"	1-13/16"

WHAT DOES AN MEAN?

AN stands for Army-Navy standard, a specification developed for military use. The dash number divided by 16 equals the tube outer diameter in inches.

Examples:
AN-4 = 4 ÷ 16 = 1/4"
AN-6 = 6 ÷ 16 = 3/8"
AN-8 = 8 ÷ 16 = 1/2"

Collection: Speedflow AN Fittings, Hose Ends & Adapters

Browse Speedflow hose ends, AN adapters, unions, reducers, bulkhead fittings, banjo fittings, weld bungs and plumbing accessories. Selected Proflow, Aeroflow and other-brand items also appear in this collection; check the brand and part number on each listing.

Choose the matching hose-end series

Match the hose end to the specified hose construction, series and size. An AN size match alone does not establish hose compatibility, and different brands or series should not be assumed interchangeable.

100 Series hose ends: check the specified hose and screw-together assembly requirements. Refer to the 100 Series installation guide.
200 Series hose ends: check the specified hose, olive and assembly components. Refer to the 200 Series installation guide.
400 Series pushlock hose ends and hose: confirm the particular hose is approved for the fitting and intended service. Refer to the 400 Series installation guide.

Adapters, unions and weld fittings

Compare both ends of every fitting: size, thread pitch, male or female connection, sealing interface, angle and clearance. AN flare, O-ring port, tapered pipe, inverted-flare and banjo connections require the correct mating components and seals; similar thread sizes are not enough.

Steel AN flare-to-NPT adapters and 816 Series AN flare-to-NPT adapters
Female unions, reducers and expanders
Weld-on fittings and bungs: check material, thread and intended use. Sensor bungs and fluid-port bungs are not interchangeable.

Plan the complete assembly

Browse Speedflow hose, fuel-system components and oil-system components alongside your fittings. Confirm fluid compatibility, pressure and temperature requirements for every component rather than assuming the whole collection suits the same service.

Check each listing for material, finish, supplied seals, olives, nuts and sale quantity. Follow the applicable assembly instructions and inspect and test the completed system before use. For brake or other safety-critical applications, confirm suitability with the component manufacturer and your installer.

Have a question?

Speedflow Fittings FAQ

How do I know which Speedflow fitting series (100, 200, 400) is right for my project?

Choosing the right Speedflow fitting series depends on your specific application. The 100 Series fittings are ideal for general performance use and are compatible with most fuel, oil, and coolant systems. The 200 Series offers additional strength and is typically used in high-pressure or severe environment setups, like racing or custom turbo builds. The 400 Series is designed for easy installation with push-lock hoses, making it perfect for DIY garage projects where quick assembly is a priority. If you’re unsure which series matches your hose or project requirements, check the product descriptions or contact our team for tailored advice.

How do I make sure the Speedflow hose I’m choosing is compatible with my fuel, oil, or coolant system?

Before purchasing, check the fluid type, operating temperature, and pressure requirements of your system. Speedflow hoses are designed for wide compatibility with most automotive fluids—including fuel, oil, and coolant. However, certain hoses (like Teflon lined) are better for aggressive fuels or high temperatures. Refer to the product specifications for each hose type, and if you’re unsure, contact us with your vehicle and fluid details. Using the matching Speedflow hose ends and fittings will ensure a leak-free and reliable connection.

Are Speedflow fittings compatible with the fuel, oil, and coolant systems in my vehicle?

Yes! Speedflow fittings are engineered for wide compatibility with most automotive fuel, oil, and coolant systems, whether you drive a classic muscle car, Japanese import, or a custom drag build. Their precision-machined threads and durable materials ensure a reliable, leak-free seal. Always double-check your vehicle’s hose size and thread type before purchasing. If you’re working on a specialty or rare model, reach out to SS Racetech Rods & Customs – we’re happy to help verify fitment for your setup.

Can I use Speedflow hose separators and clamps with other brands of hoses or fittings?

Speedflow fittings stand out due to their high-performance engineering, superior materials, and corrosion resistance. Unlike generic fittings, these are made from premium-grade aluminum and designed to handle the rigors of high-pressure automotive systems – perfect for racers, performance tuners, and anyone expecting reliability and durability. Their leak-free connections and precision threads reduce installation headaches and help maximize fluid flow, giving you peace of mind whether you’re on the track or street.

Do I need special tools or skills to install Speedflow fittings?

Installing Speedflow fittings is straightforward but does require basic hand tools and some attention to detail. For the best results, use a set of aluminum AN wrenches to avoid scratching the anodized surface and to ensure proper torque. Prepare your hoses carefully and double-check fitment before tightening. The push-lock (400 Series) fittings make installation even easier—just lubricate the hose and push it on. If you haven’t installed performance fittings before, there are plenty of instructional videos available, or you can ask our team for a quick walkthrough.