All About AN Style Fittings

When it comes to performance car parts and accessories, there are a lot of different options to choose from. You can go with the tried and true OEM parts, or you can go aftermarket. If you decide to go the aftermarket route, then you'll need to choose between AN style and NPT style fittings. In this blog post, we're going to focusing on AN style fittings and what sets them apart from NPT fittings. 

AN Size	Hose ID / Tube OD	SAE Thread Size
-2	1/8 inch	5/16-24 inch
-3	3/16 inch	3/8-24 inch
-4	1/4 inch	7/16-20 inch
-5	5/16 inch	1/2-20 inch
-6	3/8 inch	9/16-18 inch
-8	1/2 inch	3/4-16 inch
-10	5/8 inch	7/8-14 inch
-12	3/4 inch	1-1/16-12 inch
-16	1 inch	1-5/16-12 inch
-20	1-1/4 inch	1-5/8-12 inch
-24	1-1/2 inch	1-7/8-12 inch
-28	1-3/4 inch	2-1/4-12 inch
-32	2 inch	2-1/2-12 inch

AN vs NPT Fittings The main difference between AN and NPT fittings is the angle of the threads. AN fitting threads are cut at a 37-degree angle, while NPT fitting threads are cut at a 60-degree angle. The angle of the threads is important because it affects how well the two pieces will seal when they're connected.AN fittings also have a slightly smaller diameter than NPT fittings. This is important because it means that AN fittings can create a tighter seal than NPT fittings. Lastly, AN fittings are made from softer materials than NPT fittings, which makes them easier to seal. 

Pipe Thread	Threads per Inch	Inside Dia.
1/8	27	1/8
1/4	18	1/4
3/8	18	3/8
1/2	14	1/2
3/4	14	3/4
1	11-1/2	1

Why Use AN Style Fittings? There are a few reasons why you might want to use AN style fittings over NPT style fittings. The first reason is that they can create a tighter seal. This is important if you're looking to prevent leaks in your system. The second reason is that they're made from softer materials, which makes them easier to seal properly. Lastly, they're available in a wide range of sizes, so you should be able to find the right size for your needs. 

If you're looking for high-quality performance car parts and accessories, then you'll need to choose between OEM and aftermarket parts. If you decide to go with aftermarket parts, then you'll need to decide between AN style and NPT style fittings. In this blog post, we've focused on AN style fittings and what sets them apart from NPT fittings. We hope this has helped you make a decision about which type of fitting is right for your needs!

*we do not recommend mixing fittings and hoses from different manufactures.* 

Popular AN fitting manufactures: Fragola, Aeroquip, Earl's, XRP Fittings