How to fix this screw?

[Deleted User]

Hi,


it looks like a very flimsy plastic seat, so need to know what the screw is going into under the seat.

HappyUser

Actually I figured out there supposed to be a bolt there but for some reason now the screw cannot protrude enough for a bolt to be fixed.



Can I take measurements of the screw and give them to a shop online and send me relevant screws and bolts?


And how can I make sure that the bolt won't unscrew again?

[Deleted User]

Hi,


can you give us a picture of the underside?

unrecordings

HappyUser wrote: »

Actually I figured out there supposed to be a bolt there but for some reason now the screw cannot protrude enough for a bolt to be fixed.

Can I take measurements of the screw and give them to a shop online and send me relevant screws and bolts?

And how can I make sure that the bolt won't unscrew again?

Be sure to take measurements of one of the other bolts a reference of what works on the other three legs - post the info here - although as others have said, if you can manage it, a photo might be better
as technically screws & bolts are different means of fastening things - you use a nut and bolt or you use a screw, depending on what you're trying to connect together

HappyUser

Mmm the screw is like this:


https://unsee.cc/0b1f753f/


So, I assume the turns are still fine and only the bolt is missing. But how can I secure the bolt so that it won't get lost again?

unrecordings

So it's a bolt, can't really tell whether M5 or M6. Only has a thread on the last 12mm so of the shaft, which looks very tired.

A standard M5 pozi (or M6 if it's actually M6) x 60mm might do the trick (with nut & sprung washer of course)

Anyone else agree..?

Jackmydad

unrecordings wrote: »

So it's a bolt, can't really tell whether M5 or M6. Only has a thread on the last 12mm so of the shaft, which looks very tired.

A standard M5 pozi (or M6 if it's actually M6) x 60mm might do the trick (with nut & sprung washer of course)

Anyone else agree..?

Agree. Difficult to make out the diameter though. As you say, M5 / M6

If it keeps coming undone I'd use a "self locking" nut. Sometimes called a "Nyloc" nut.

B_G_B

Just to add my pennyworth. I would use a nyloc nut or locking compound (loctite or similar). I would not use a spring washer as these have been shown to not work in most cases, and can actually make the locking of nut and bolt less effective.

Norman_Castle

HappyUser wrote: »

So, I assume the turns [thread] are still fine and only the bolt [nut] is missing. But how can I secure the bolt [nut] so that it won't get lost again?

Either buy a locking nut or cover the thread in glue. PVA or wood glue might work. As a replacement nut will only be a few pence buy a few so if it does vanish you will have a spare.
If you've any diy friends or family its likely they've got a tub of nuts, ask them.

unrecordings

B_G_B wrote: »

Just to add my pennyworth. I would use a nyloc nut or locking compound (loctite or similar). I would not use a spring washer as these have been shown to not work in most cases, and can actually make the locking of nut and bolt less effective.

I'd say Nyloc is a good call, I've used M3 versions and they just won't come loose (the old skool alternative being the use of two standard nuts instead of one)