ᐅ Has anyone ever tried using heavy-duty screws for Kallax units?

Hello everyone,

I plan to load my Kallax shelf more heavily than usual, including with some heavy binders and electronic devices. I’ve noticed that the original screws are sometimes considered a weak point when the shelf is under greater load. Has anyone tried using reinforced screws, such as thicker ones or made from stronger material, to increase the stability of their Kallax?

I’m interested in whether this is practically feasible, which types of screws are suitable (e.g. metric instead of wood screws, stainless steel, galvanized, etc.), and whether this actually results in a noticeable improvement in stability.

It would also be helpful to know if the assembly becomes more complicated or if there are any considerations regarding the hole pattern or material compatibility of the Kallax.

Thanks in advance for your experiences and advice!

I used reinforced screws, metric screws combined with washers. The shelf became more stable, but it wasn’t fundamentally different. Important: don’t use screws that are too long, or the wood will split. Installation is a bit fiddly.

When using reinforced screws on the Kallax, it is important to ensure that the screw materials are ideally rust-resistant, such as stainless steel or galvanized steel. The original holes are designed for thin particleboard screws; using thicker screws can easily damage the material if they are not installed correctly.

One option is to use metric screws with pre-drilled holes (slightly smaller than the screw diameter) to reduce material stress. This can improve stability, but modifications are necessary.

Hello!

Your idea of using reinforced screws makes sense, especially if you want to support heavy loads on the Kallax. It is important to match the screw size to the material. The laminated chipboard is sensitive to screws that are too thick or too long. I also recommend pre-drilling to avoid cracks.

Additionally, you can achieve extra stability with metal brackets and braces if screws alone are not enough.

Feel free to ask if you need more details!

I also used stronger screws for my Kallax, stainless steel M4 instead of the regular particleboard screws. Important: pre-drill and don’t screw in too deep. It held up well.

Using reinforced screws on the Kallax unit can be worthwhile under certain conditions. The original fasteners are designed for light to medium loads. When the shelf is consistently subjected to heavier loads, the risk of material failure at the joints increases.

pa-wolf schrieb:
Important: Don’t use screws that are too long, or the wood will split.

This is an important point. The particle boards are thin and delicate.

Lorukeo schrieb:
Metric screws with pre-drilled holes

This method offers the best compromise between durability and material protection. I recommend additionally using threadlocker (Loctite) to prevent loosening.