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Making AN Braided Hoses
The classic steel braided line with anodized red and blue hose ends is the epitome of AN hydraulic plumbing. The stuff is expensive but worth it, therefore we want to get it right the first time. Measure up the lengths you need twice and cut the hose once. Here is how to properly attach the hose ends to ensure leak free seals whether connecting to the hard line made previously, or to AN fittings directly on fuel pumps, filters, or other components.

 


The fundamental pieces of AN hose end; the socket (left) and nipple (right). This particular fitting is a straight -8AN swivel fitting.		  
The best way to cut steel braided line is with a cut-off wheel or chop saw. Hack saws work but can fray the steel wire. Always wrap the area to cut with strapping or duct tape and cut through the tape to make a clean cut without fraying.
     

Place the hose socket in a vise. We prefer to use aluminum "soft jaws" to prevent from damaging the anodized aluminum. The vise inserts are availabe from any of the AN fitting manufacturers, such as Aeroquip.		  
With a firm grip on the braided hose insert it firmly into the socket. It helps to ensure the hose is entering the socket flush. Using a twisting motion helps to move the hose past the raised constriction inside the adapter.
     

As seen in this image, the hose should be about 1/8" from bottoming out inside the adapter.		  
Lightly oil the threads on the nipple and insert into the hose end. Keep a firm grip on the braided hose to prevent it from slipping out while trying to engage the threads. Note the white paint mark on the hose to help detect if the hose pushes out.
     

Once the threads are started the vise can be used to hold the AN fitting stationary while downward force is applied while twisting to screw the two halves together. 		 
It is important not to screw the nipple all the way against the socket. Leave a 0.030-0.040" gap between the two fitting pieces.
     

When connecting AN line to the fitting do not use any sealant, as it is the flare angle that does the sealing not the threads. Also avoid over tightening. A drop of oil can be used to ensure the soft aluminum threads do not strip upon assembly. 		 

 
 
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