Expanding plastic fastener

摘要

A coupler for coupling together plates includes a male member having a head and a pin-like portion having male threads and depending from the lower surface of the head and a female member having a flange facing the head of the male member, a leg portion depending from the lower end of the flange and a bore extending from the upper surface of the flange into the leg portion and capable of receiving the pin-like portion of the male member. An upper portion of the inner periphery of the bore is provided with a helical ridge.