Catalog > Electro-Mechanical Components > Fasteners Hardware > Electronic Hardware > Heatsink Insulators and Bushes Transistor Washer Transistor Washer TW-10 BUSH - TO220 ID=4,0MM SOD=5,0MM H=5MM 1.71 ZAR inc for 1 Each 506 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Overview This washer is designed to mount on transistor to prevent short circuit between transistor cover and heat sink.