Patent ID: 7990722

Claim:
A fastener for securing a heat sink to a printed circuit board, the fastener comprising: a fastener post comprising a head, a post body and a threaded portion, the post body having a first extension section connected with the head, a second extension section connected with the threaded portion and a recess section connected between the first and second extension sections; a clasping element comprising an annular clasping body, a first clasping portion extending from the clasping body along an axis of the clasping body and a second clasping portion extending outwardly and then downwardly from the clasping body, wherein the clasping body is mounted around the post body of the fastener post, the first clasping portion engages with the recess section of the post body of the fastener post to restrict the fastener post from moving relative to the clasping body, and the second clasping portion engages with the heat sink; and an elastic element mounted around the post body of the fastener post and located between the head and the clasping body of the clasping element.