Shop Tour - Hardcore Drag Racing

  Most likely, at one time in your life you have seen a killer custom car or race car that has had fittings like these and wondered , how do they work ? And where are the clamps to how can I use them on my car ?   Lets start with how these fittings came about. A/N fittings  were originally designed for use in aerospace and  military applications. The size & specifications were established by the military back in World War II, and stems from a joint standard agreed upon by the Army and Navy, hence AN. The Army-Navy involvement is also the origin of the red/blue color combination that was traditionally used in the anodized finishing process. 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 -inch increments.  Therefore, a -8 AN size would be equal to 1 ⁄ 2 -inch OD tube. However, this system does not specify the ID (inside diameter) of the tubing because the tube wall can vary in thickness. E