Injection molded thermoplastic insert

An insert for incorporation into a concrete structure to facilitate attachment of a threaded fastener to the concrete structure, the insert comprising:

• an elongated barrel defining an interior for receiving a shaft, the barrel including opposite proximal and distal ends and an opening at the proximal end;
• a base connected to the barrel adjacent the distal end of the barrel, the base extending outwardly beyond an outer surface of the barrel to define a surface oriented substantially perpendicular to a central axis of the barrel for anchoring the insert within the concrete structure;
• and
• a plurality of elongated ribs each connected to the base and to the barrel, each rib including a plurality of segments arranged in series along the length of the rib and including a first segment located adjacent the base, each segment of the rib extending radially from an outer surface of the barrel to a distance that decreases with each succeeding segment from the first segment such that each segment defines a bearing surface that is oriented substantially perpendicular to the central axis of the barrel.