A component coupled to a heat dissipation unit, allowing a screwing element to be pivotally coupled to a heat dissipation unit, includes a body, a stop portion, a first inner engagement portion, a second inner engagement portion and a first outer engagement portion. The body has a first part and a second part and forms therein a through hole which extends axially. The stop portion is circumferentially disposed at the rim of the first or second part. The first inner engagement portion has checking plates and corresponds in position to the stop portion. The second inner engagement portion has stop blocks disposed at the first or second part. The first outer engagement portion is disposed at the rim of the body and opposite the stop portion. The screwing element is fixed to the heat dissipation unit temporarily but firmly, thereby preventing disintegration and disconnection during transport.
