This is a specialty thread originally designed for plastics and is best for low pressure applications such as plastic, particle board, masonite, and wood. It features a double-lead thread in which the lower thread is duller while the higher thread is sharper, essentially trapping more material in between the threads. This helps to resist pull-out and allows for a lower driving torque.
This type of screw is designed for a face frame/pocket hole application. What is a pocket hole? This is when a hole is drilled at an angle -- typically 15 degrees -- into one piece of wood that allows a screw to join to another piece of wood in a concealed fashion. Also, this screw features a type 17 point which is the self-drilling point for wood applications. This point prevents splitting and bursting of wood -- particularly for softwoods, particle board, and MDF board by displacing excess wood material from the drilled hole.
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