Round head metallic drive screw having multiple start threads of large helix angle, with a pivot. For making permanent fastenings in metals and plastics, when forced into the work under pressure.

Drive screws shall produce mating threads without shearing of
threads or fracture of the screw when driven into properly sized
holes in test plates having a Rockwell hardness of B70 to B85.

Not recommended for use in materials of a hardness greater than
Rockwell B 65.