Magnetic catch to hold window open against outside wall

You can get self adhesive nickel plated neodymium magnets at 2mm thick and thinner with substantial grip capablity upto 3kgf onto mild steel. They should resist the weather fairly well although a coat of yatch varnish or white gloss might be wise - they are rather brittle.

Thanks.

Are you saying that I only need one magnet, and some mild steel for it to fix to? I note that you can get discs with a countersunk hole which might make things easier.

Only issue then is stopping the mild steel from rusting. Hammerite perhaps.

Cheers

Davev R

Cheapest way if the grip is sufficient. Or you can get opposite handed magnets N polarity and S polarity outward facing with almost twice the pull. The more powerful ones are capable of giving you a painful nip.

You can probably find a rust resistant but still magnetic steel offcut. Mild steel and paint is still the cheapest though.

Maybe try a caravan/static homes parts site?

I don't know about that, but to me, magnets are not a great choice for holding doors open. I suppose its fine if there is no way that the wind could possibly get behind the door, but as magnets have a very short pull in range, its a case of once it loose it means trouble. I'd be tempted to just put some form of wooden turning hasp thingy on the wall that blocks it when you want to myself.

Ok its manually operated, but...

Brian

On the static home theme again, I've seen exterior doors with a small(ish) shaped plastic bit sticking out of the door which locks into a "catch" on the outside when the door is fully open, doesn't take much of a pull on the door to release it but it would withstand wind.

This kind of idea:

In message , David WE Roberts writes

Give it the occasional quick squirt of WD40, and it'll probably outlast the house.

Zinc-plated washer? Carriage bolt head? Passivated wood screw?

Would searching for magnetic switches (as used in bugler alarm systems) reveal anything suitable? The switch is two part - a reed switch and a magnet.