Screws with retaining rings ?

[rideforever]

Does anyone know what the rings are called that screws are put through so that they can be removed ??
Picture attached.
Cheers

 

[rsgaz]

Cup washers. Cheap ones are a flat piece of metal, pressed into shape, so the underside is hollow...

Decent ones are solid...

Depends what you need them for really.

 

[JohnD]

the one in the picture looks like it might be a plastic screw cover, and the lid has fallen off

https://www.screwfix.com/c/screws-n...nagedredirect-_-screwsfixings-_-screwcapscups

they are ornamental, rather than "so the screw can be taken out"

the metal ones are used when you only have countersunk screws but don't want to countersink them.

 

[rideforever]

Thanks !!!

The idea (as I was told) was that the beads on the side of the sash window could be removed in the future more easily for maintenance of the sash weights, hence he put in those things. Not sure if there are better removable fixings.

 

[JohnD]

I suppose a cup washer on top of a painted wooden frame means you could remove it without damaging the paint, but they've been painted over now, so that no longer applies.

If they're just sash box beads, they don't need any significant strength. You'll need to take them off when the cord breaks.

PS
IMO the plastic covers would look neat enough with white paint, as long as the domes don't fall off. a pack of a hundred or so is very cheap.