PCI bracket retainer for adapter card applications

A bracket retainer is provided for securing an adapter card in a computer chassis in manner that maintains the electrical and the mechanical stability of the computer chassis and adapter card. This bracket retainer approach secures the adapter card to the computer chassis by utilizing a rotating door structure that allows the adapter card to be tightened into its card connector, as a rear tab of the adapter card, which is protruding through an opening of a rear panel of the computer chassis, is engaged by the rotating door structure. This bracket retainer approach also allows the bracket retainer to be secured to the computer chassis by interlocking the door structure with a top cover of the computer chassis.