Fischer elektronik aluminium heat sink mount bolt on to 220sot 32to 3p fischer elektronik sk 104 25 4 sts the fischer elektronik aluminium heat sink mount bolt on 14cw to 220sot 32to 3p is a bolt on heat sink featuring solder pins for the secure and effective vertical mounting of electronic components having a to 220sot 32to 3 p type package the heatsinks are available in a choice of thermal resistances and are manufactured from 15mm thick alloy with a black anodised