ᐅ Why do some BILLY screws keep coming loose?

Created on: 29 Aug 2021 18:23
L
Lafope
Hello everyone,

I have noticed several times with my Billy shelves that the included screws seem to keep coming loose, even though I have tightened them with the correct screwdriver. I am curious to know why this happens.

Are the screws themselves of low quality, is the threading not fitting correctly, or could there be mechanical factors causing them to loosen over time?

This is frustrating because the shelves quickly feel unstable under load, even though everything is properly assembled. Does anyone have experience or solutions on how to fix this problem permanently?

Thanks in advance!
L
Lafope
31 Aug 2021 10:07
Thank you for the input regarding the threaded inserts.

I will probably start by trying the longer screws and careful screwing. If that doesn’t help, I will take a closer look at the inserts.

One more detail: Are there differences between the screw head types? My set contains standard Phillips screws. Could another type (e.g., Torx) hold better or reduce the chance of screws coming loose?
I
Ianlau
31 Aug 2021 11:22
Lafope schrieb:
Are there differences in screw heads?

Generally, the type of screw head does not affect whether the screw will come loose, as the main issue lies primarily with the thread gripping the wood.

However, Torx screws often allow more torque to be applied cleanly, and the screw head is less likely to be damaged or stripped. This means you can tighten the screw more securely and firmly.

If you plan to assemble and disassemble the shelf frequently, Torx screws can be advantageous because the screw heads tend to remain more stable.

In short, Torx screws do not directly prevent screws from coming loose, but they make assembly easier and more durable.
P
PAR63
31 Aug 2021 14:38
A quick addition regarding screw heads:

Torque transmission is better with Torx, but you need to use the correct screwdriver—it's best not to use a universal one to avoid damaging the head. Phillips is classic, but it can wear down more quickly with frequent removal.

And another tip: pre-drilling the holes helps prevent cracking and splitting, which can also cause screws to loosen. This is especially useful with engineered wood.
J
joroti
31 Aug 2021 15:03
I have been using Torx screws for shelves for some time now and have noticed that they come loose less often. It takes a bit more effort to screw them in, but it's worth it.
R
Ryder35
1 Sep 2021 08:11
One more simple trick: After screwing in, rub a little wax or soap onto the screw. This helps prevent loosening caused by vibrations.
L
Lafope
1 Sep 2021 09:07
Great, thanks for all the tips and explanations. I now have a good overview and will gradually test different things, from longer screws to careful pre-drilling, wood glue, and possibly threaded inserts.

If I have an update, I’ll get back to you!