I'm somewhat curious as to how to use a nylon shoulder washer with a bolt. There is an example of this here (https://electronics.stackexchange.com/a/45579/95654), but I can't figure out how it would stay attached to the board. The diagram does not imply that the washer is threaded, so the hole is large enough to fit the washer (without any teeth to hold it) and ensure that the bolt does not close any circuits, but then how does it not fall out if it was inverted/sideways? Even if there was a nut at the bottom of the bolt, I still can't see how it would be stable.
Answer
(source: Heatsink mounting kit)
The shoulder washer is intended for bolting a TO-220 to a heatsink (or some other metal part) while maintaining electrical isolation with the heatsink. There is usually a nut on the other side of the heatsink, or the screw hole is threaded.
If you are attaching the TO-220 to a part of your PCB that has no traces, then you don't necessarily need the shoulder washer. The PCB material under the TO-220 would act as an isolator.
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