Patent ID: 7682118

Claim:
A fastener comprising: a shank; and a head, the shank having a penetrating tip distal most from the head, the shank including a conventional thread formation and an anti-back-out thread formation having an inclined front flank surface and an inclined rear flank surface, wherein the front flank surface is formed at an angle of about 30 degrees to about 60 degrees and wherein the rear flank surface is formed at an angle that is greater than zero and less than 30 degrees relative to a plane through and normal to the shank and passing through a top of the thread, wherein the conventional thread formation is adjacent the anti-back-out thread formation, between the anti-back-out thread formation and the penetrating tip, wherein the conventional thread formation defines an inclined front flank surface and an inclined rear flank surface, wherein each flank surface is formed at about an equal angle relative to a plane through and normal to the shank.