Catalog > Electro-Mechanical Components > Fasteners Hardware > Electronic Hardware > Heatsink Insulators and Bushes Transistor Washer Transistor Washer TW-10 Transistor Washer 1.71 ZAR inc for 1 Each 630 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.