Patent ID: 8640328

Claim:
A system for fastening a head stack to a hard drive base assembly, the system comprising: a threaded head stack pivot having a socket defined therein, wherein the socket comprises a proximal portion defined by a plurality of inner walls arranged parallel to a longitudinal axis of the socket and a distal portion having a width less than a width of the proximal portion and forming a ledge adjacent to the proximal portion; and a bit for driving the threaded head stack pivot into a hard drive base assembly, wherein the bit comprises a head comprising a plurality of contact surfaces arranged parallel to a longitudinal axis of the bit and a plurality of tapered surfaces extending from respective ones of the plurality of contact surfaces to a distal end of the bit, wherein the bit is configured to engage the ledge of the distal portion of the socket at seams formed between adjacent ones of the plurality of tapered surfaces and to engage the plurality of inner walls of the socket with respective ones of the plurality of contact surfaces when driving the threaded head stack pivot into the hard drive base assembly.