A -3 male straight bulkhead is a type of fitting, typically used in motorsport and performance automotive applications, that allows a fluid line to pass through a panel, firewall, or other “bulkhead” while providing a secure, leak-free connection. The “-3” refers to the AN (Army-Navy) size, which is a standardized system for hose and fitting sizes.Â
Product description
A -3AN male straight bulkhead fitting has the following characteristics:Â
Bulkhead:Â The fitting features a threaded extension that is inserted through a hole in a panel. A special nut, often called a jam nut, then screws onto the extension from the other side, securing the fitting in place.
Male:Â Both ends of the straight fitting feature male AN threads.
-3 AN Size:Â The size of the fitting is -3AN. The AN sizing system is based on the outer diameter of tubing in sixteenths of an inch. A -3AN fitting is equivalent to a 3/16-inch outer diameter line.