Consisting of PEM® Type HSCB™ captivating screw and PEM Type HSL™ spring mated to PEM Type HSR™ broaching receptacle nut or standoff, Heat Sink Mounting System securely attaches heat sinks to PCBs while providing firm and constant contact to chip component for optimized heat dissipation. Audible click serves to prevent over tightening by signaling when screw is fully engaged. Screws and broaching nuts or standoffs can be specified in thread sizes #4-40 to #6-32 / M3 and in various lengths.