http://afsindustrial.com/huck360/performance-engineered

Because the Huck 360 was designed with shallow, low-notch-factor
bolt threads (the grooves aren't rolled as deep as a conventional bolt), the
effective diameter of the fastener itself is widened by as much as 18 percent,
increasing tensile and fatigue strength. According to maker Alcoa Fastening
Systems, the Huck 360 thread delivers five times the fatigue life of a standard
thread bolt, and finite element analysis (FEA) reveals that the shallow thread
form of the Huck 360 concentrates 27 percent less axial stress in the root than
conventional bolt threads. This stress concentration is the primary contributing
factor leading to stress corrosion cracks (SCC) and fatigue failures.

http://youtu.be/cucE7btq1T0

Thanks Dutcher