What are the three head styles of a jo-bolt?

The three head styles of a jo-bolt, which is a type of fastener commonly used in aircraft structures, are flush, hex, and hex-millable.

Flush head jo-bolts are designed to sit flush with the surface of the material they are fastened to, which is especially important in aviation applications where aerodynamic smoothness is crucial. Hex head jo-bolts feature a hexagonal shape that allows for easy installation and removal using a wrench. This makes them versatile and efficient for maintenance and assembly tasks. Hex-millable jo-bolts have a hex head that can be machined down if necessary, allowing for adjustments in tight spaces or specific configurations while retaining the ability to use standard tools.

These head styles are vital in aircraft structural installations due to their specific functionalities and the need for secure connections that are resilient to the stresses experienced during flight.