Patent ID: 8529178

Claim:
A building structure comprising: a first steel building member and a second steel building member connected by a plurality of fasteners, each fastener being steel comprising a head capable of clamping the first steel building member to the second steel building member with the fastener installed, a threaded portion adjacent the head, a thread-forming portion of at least HRC 50 hardness adjacent the threaded portion adapted to form threads into at least the second steel building member, and a fluted lead portion of at least HRC 50 hardness adjacent the thread-forming portion with a nominal diameter in a range from 60% to 95% of major diameter of the threaded portion adapted to form a fastener opening, the thread-forming portion having a series of lobes with recesses between said lobes having a ratio of strip torque to thread-forming torque of at least 3.0 and a ratio of strip torque to drive torque greater than 6.0 over a range of combined thickness of first and second steel building members from about 0.036 inch to 0.084 inch, the lobes positioned about the rotational axis.