ᐅ Which screws are suitable for modifying Ikea Besta units?

Hello everyone,

I’m currently planning a modification of my Ikea Besta cabinet, where I want to replace some of the original connectors with more durable screws. My question is: which screws are best suited for modifying an Ikea Besta if you prioritize stability and durability without damaging the furniture structure?

I want to avoid screws that are too long or too thick, as these could weaken the particleboard panels. I’m also interested if there are specific types of screws that work better with the furniture panels, such as particleboard screws, flat-head screws, or possibly machine screws with inserts.

I would appreciate detailed advice, especially recommendations regarding the length, diameter, and material of the screws. Thanks in advance!

kaujulie41 schrieb:
Which screws are best suited for modifying Ikea Besta units if you prioritize stability and durability without damaging the furniture structure?

It is important to consider the material type of the panels. Besta units typically use MDF or particleboard, which the screws should not split or damage.

I would recommend using screws with coarse threads, such as special particleboard screws with partial threading. The partial threading helps pull the parts together without applying too much pressure on the wood.

The screw length is also crucial: it should not reach the back side and is ideally around 30-40 mm (1.2-1.6 inches).

Alternatively, you can also add metal or plastic cam lock fittings, as screws alone often do not provide optimal stability.

What exactly are you planning to modify or reinforce? That could further influence the choice of screws.

Tinaneo schrieb:
Besta typically uses MDF or particleboard, which must not be split or cracked by screws.

That’s not entirely accurate. In Besta, I often found standard HDF or melamine-faced particleboard for the carcass. MDF is less common but possible.

In general, for modifications I always recommend stainless steel screws (A2) with a pointed thread and flat head, typically particleboard screws with fine threads near the head and coarse threads along the shank.

- Ideally, screws with a diameter of 4-5 mm (0.16-0.20 inches); thinner ones tend to break, while thicker ones are often too bulky.
- The length should be chosen so that it holds firmly without protruding from the panel edge, usually around 30-40 mm (1.2-1.6 inches).
- If you plan to use metal threaded inserts, you can also use machine screws, but you need to pre-drill for those.

Pre-drilling in particleboard is especially important to protect the material and prevent splitting.

What type of load will the modification need to support? That also determines the choice of screws. A small tip: for high loads, adding brackets or metal connectors is a good supplement.

I usually use 4x35 mm (1.5x1.4 inch) countersunk chipboard screws for shelves.

Always pre-drill and tighten with the appropriate torque.

Otherwise, they can break easily.

Gafiel schrieb:
That’s not entirely accurate in general; I often used standard HDF or melamine-coated particle boards for the carcass with Besta.

That’s a good point, thanks for clarifying.

sarGabriel schrieb:
I usually use 4x35 mm (1/8 x 1 3/8 inch) countersunk particle board screws for Besta.

That roughly matches what I meant and is definitely a good standard.

Just a small addition: If you know you’ll need to unscrew and re-tighten screws frequently, it might be worth considering threaded inserts or even plastic anchors to protect the threads.

It would also be interesting to hear if anyone has experience with alternative joining systems like flat dowels or cam connectors for Besta modifications.