Center lock device for automobile wheels

A center lock device for automobiles, comprising:

• an adapter having a conical barrel with a proximal end from which a joint flange integrally projects, said joint flange being formed with a plurality of stud bolt receiving holes and a plurality of torque pin receiving holes alternating with each other and disposed in a radially symmetrically distributive pattern,
• a center shaft portion integrally projecting from the conical barrel of the adapter and formed with a male thread around the outer perimeter of the center shaft portion for threaded engagement with a center nut,
• said adapter being attachable to a hub of an axle with the stud bolt receiving holes fitted on stud bolts on the hub and a hub nut threadedly engaged with the stud bolts,
• said torque pin receiving holes capable of fitting torque pins projecting from a boss of a wheel disk,
• said center nut being threadedly engageable with said male thread of the adapter from the front, thereby fixing the wheel disk to the adapter,
• a female thread for receiving a keep bolt cut into the outermost distal end of the center shaft such that its spiral pitch and spiral direction differ from those of the male thread,
• a keep bolt having a head smaller in diameter than the center shaft portion threadedly engageable with the female thread from the front to lock the center nut from the front,
• a removable member attachable to said keep bolt so as to extend over an outer surface of said nut so as to prevent it from loosening,
• said center shaft and said conical barrel being integrally formed such that the adapter comprises a single integrally formed piece, and
• said center shaft comprising a relatively thin solid shaft.