Mizutani Electric SP121K Heat Sink For Transistor (13x13x18.5mm)
Transistor Riveted to Heatsink? Tried every Hex key I have. Anyway to take off the transistor? The heat sink is glued on, well I think it is because trying to remove with
ESP - Heatsink design and transistor mounting
isolation - Are the non-metallic colored heat sinks of transistor packages electrically isolated/nonconductive? - Electrical Engineering Stack Exchange