A heat sink (10) for removing heat from heat-generating devices includes a
plurality of fins (12) interconnected together by a fastener (20)
extending therethrough. Each fin comprises a main body (14) and a flange
(16) bent from an edge of the body. The main body has a thickness and
defines a through hole (141, 142, 143) therein. The fastener comprises a
plurality of alternating bars (200) and positioned portions (212). Each
positioned portion has a same thickness as the main body and is
accommodated in the through hole. Each bar is sandwiched between two
adjacent main bodies, for fixing the fins in position and preventing the
fin from sliding along a length direction of the fastener. The bar has a
width larger than a diameter of the through hole.