Patent ID: 8616816
Filing Date: 2013-12-31
Classification: F16B

Abstract:
1. A fastener for composite or plastic material comprising: a head rotatably couplable for application of a torque and having a recessed underside and a lower cutting rim; an elongated shank extending from said head and terminating at a distal tip and comprising a neck portion having a uniform neck diameter adjacent said head and extending a neck distance, a first portion having a first diameter less than said neck diameter and a lower second portion having a reduced second diameter less than said first diameter; said first portion being traversed by a plurality of longitudinally spaced rings spaced a ring distance less than said neck distance; and said lower portion being traversed by a right-hand thread with a spiral array of notches, said right-hand thread having a pitch spacing less than that of said ring distance, said rings having an effective major diameter greater than that of said right hand thread.