As usual, it's a name thing - patio door latch interlock

Jun 29, 2025 Last reply: 1 year ago 11 Replies

Our patio door has a little pin that comes out of mechanism that prevents the latch being operated when the door is open.



Our lad in a moment of mischief nearly 20 years ago managed to lose it (we still don't know how).



Since then I had to source an emergency replacement which turned out to be a screw from a electrical connector strip.



Now it's starting to fail and the latch won't work.



If I knew what it was called, I'd have a better chance of finding it. Currently all I seem to be able to see are the actual bolts that do the locking.



Does anyone have a clue as to what this screw could be called ?


A picture of the latch and where the screw goes would help…

Tim

The circled bit :)

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Looks like you need to remove the patio door to replace the lock. File that under ****ed if I am doing that (again).

I doubt that it has a name. Just checked mine and it looks like a standard screw that's been appropriated by lock makers. It could be an M4 (4mm dia) but I don't really know about these things. Your problem will be only wanting one. A locksmith might be able to help.

Mine has a small flat metal tongue, instead of a pin/screw, prevents the gearbox turning when pressed.

I measured the screw that fitted as a stopgap as 2.65mm

snip

Would replacing just the screw help?

If a screw from an electrical strip fitted - is it a BA thread?

6BA should have a diameter of 0.11in or 2.79mm

Good lord, that's a blast from the past.

Yes - I remember 6BA nuts & bolts (this is really a bolt, I guess).

I'll look into that now !

Not hard to find and very cheap even in quantity.

Try ebay

Might be M2.5 or M3.

Both very common

I already had but I don't need one.

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