Patent ID: 8322960

Claim:
A fastener for use in concrete comprising: a shank; and a head, wherein the shank has a tip distal most from the head, the shank including a first helical thread formation having a thread form thereon formed from two portions disposed upon opposite lateral sides of the thread form, the thread form having a root, the two portions including an alternating series of lobe members and base portions, the lobe members and base portions each having a height as measured from the root, the height of the lobe members being greater than the height of the base portions, the height of the base portions being greater than zero, the shank including a single second helical thread formation equally spaced between the first helical thread formation as the first helical thread formation traverses the shaft, wherein the first helical thread formation extends from about the tip substantially the entire length of the shank, and wherein the thread form has an arrowhead like shape.