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Where did the AN Fitting come from and what advantage does it have over a standard hose with clamp?

The AN thread is a particular type of fitting used to connect flexible hoses and rigid metal tubing that carry fluid. It is a US military-derived specification that dates back to World War II and stems from a joint standard agreed upon by the Army and Navy, hence AN.

AN sizes range from -2 (dash two) to -32 in irregular steps, with each step equating to the OD (outside diameter) of the tubing in 1/16" increments. Therefore, a -8 AN size would be equal to 1/2" OD tube (8 × 1/16 = 1/2). However, this system does not specify the ID (inside diameter) of the tubing because the tube wall can vary in thickness. Each AN size also uses its own standard thread size.

AN fittings are a flare fitting, using 37° flared tubing to form a metal-metal seal. They are similar to other 37° flared fittings, such as JIC, which is their industrial variant. The two are interchangeable in theory, though this is typically not recommended due to the exacting specifications and demands of the aerospace industry. The differences between them relate to thread class and shape (how tight a fit the threads are), and the metals used.

Note that AN threads are different for bolts and fittings. In bolts the number refers to the diameter of the bolt whereas in a fitting it refers to the OD of the tube and thereby have different threads. For example, AN6 bolt has a 3/8-24 thread [1] whereas an AN6 fitting has a 9/16-18 thread.[2]

Note that 37° AN and 45° SAE fittings and tooling are not interchangeable due to the different flaring angles. Mixing them can cause leakage at the flare.

Originally parts were made compliant to the specification MIL-F-5509, but they are now controlled under SAE AS (Aerospace Standards) specifications AS4841 through AS4843 and AS4975.

When comparing traditional hose and barb connections to AN fittings you'll see the advantage to using AN fittings. Quick removal without having to struggle with a hose clamp and trying to pull the hose off the barb which can be a pain and could damage the hose. The AN fitting can be used many times without ever needing to replace a gasket.  


Quik Latch Frequently Asked Questions

Can Quik Latch Products Be Painted?

Yes, Quik Latch products can be painted. A few sample cars in the 'completed installs' link show how they look when painted. 

Are Quik Latch Products Lockable?

The Low Profile Quik-Latch Hood Pins are now available with a locking option.. 

Can I remove my stock hood latch now that I have the Quik Latch system?

For liability purposes, we do not advise removing the stock hood latch. 

How much does one Quik Latch set weigh?

One complete Quik Latch hood pin set weighs 16 ounces (1 pound). 

Do Quick Latch sets come with mounting brackets for the pin studs?

No. Due to the fact that every make and model is different, custom mounting brackets will need to be created to fit the needs of each make and model. 

What tools are needed to install a Quik Latch set?

1 1/2" hole saw 1 1/16" wrench (2) 3/16" drill bit at least 2" long 3/32" allen wrench Loc-tite thread lock center punch and hammer. If you need to fabricate mounting brackets, you will need fabrication equipment as well. 

What hardware is included with a Quik Latch set?

For the hood pin sets: 2 - Quik Latch bodies 2 - Retaining rings 4 - 7/16" stainless steel nuts 4 - 7/16" stainless steel washers 4 - 10x32x1" set screws 2 - Hood pin studs 

The mini Quik-Latches are sold as individual latches and include the following with each latch: 1 - Latching Body 1 - Latching body retaining nut 1 - mounting stud 2 - washers 2 - mouting stud nuts 

Will Quik Latch products rust?

Quik Latch products are made of T6 aluminum and stainless steel and they will not rust.