Why does Spiralock result in more uniform load distribution?
The Spiralock thread form distributes loads more uniformly than a conventional thread form for two reasons: 1. With Spiralock, contact is concentrated at the crest of the male thread, rather than near the center of the flank. This results in greater compliance of the thread form. 2. With Spiralock, the crest of the male thread is pulled into a 30° “wedge” rather than onto a 60° flank, permitting greater axial movement before achieving full load, thereby substantially reducing the potential of fatigue failure.
