ᐅ Which screws are better suited for heavy-duty use with Billy bookcases?

Hello everyone,

I am planning to use several Billy shelves from IKEA for storage purposes, which need to support fairly heavy loads, around 40 kg (88 lbs) per shelf. My question is, which screws are best suited for heavy-duty use with Billy shelves?

I would like to know which types or sizes of screws improve the stability of the shelves and prevent damage from heavy loads in the long term. I am especially interested in whether it is better to use only the original screws or if there are alternatives, such as thicker or longer screws, or special materials like stainless steel or galvanized screws.

Additionally, it would be important to know if the screws should generally be secured with wall anchors and if there are any specific assembly tips to increase load capacity.

I appreciate any detailed and well-explained advice, as the shelf should not only serve a visible decorative function but must truly support heavy loads. Thank you in advance!

neovin7 schrieb:
which screws are best suited for heavy use with Billy shelves?

Hello, neovin7,

you are right, this topic is important because the stability of Billy shelves mainly depends on choosing the right screws and proper assembly. Generally, IKEA often uses chipboard screws with a smaller diameter for their Billy shelves, which are suitable for normal use but can reach their limits under heavy load.

I therefore recommend using somewhat thicker chipboard screws, for example, those with at least 5 mm (0.2 inches) diameter, especially if you screw them into the side panels. Metal or machine screws are not a good choice because the shelf material is chipboard, which is optimized for quick screwing of chipboard screws.

Stainless steel or galvanized screws make sense primarily in moist environments; otherwise, a good electro-galvanized version is sufficient for normal indoor conditions. It is important to drive the screws in without placing them too close to the board edge, as the material can break otherwise.

Additionally, I suggest not relying solely on the shelf boards being supported by fastening to the side panel. Using metal angle brackets with appropriate screws can provide significantly more stability, especially when dealing with heavy loads.

If you want to use wall plugs, use them only for mounting the shelves to the wall, not in the side panels. These plugs don’t really help with the load capacity of the shelves themselves but are useful for overall stability.

I hope this gives you a good starting point! If you like, I can also provide specific screw recommendations.

dunitan schrieb:
to opt for slightly thicker chipboard screws, for example, those with a diameter of at least 5 mm

This is an important tip. Additionally, I would say that besides the diameter, the length of the screws is crucial to ensure they grip deeply enough into the material. For the side panels of Billy shelves, which are relatively thin (about 1.8 cm (0.7 inches)), screws should not be too long to avoid the material breaking out on the back side.

Recommended screws have a diameter of around 4.5 to 5 mm (0.18 to 0.2 inches) and a length of 35 to 45 mm (1.4 to 1.8 inches), depending on the installation situation. Make sure the screws feature a coarse thread pitch, as these anchor better in chipboard and are easier to drive in without splitting the material.

The screw material also matters: zinc-coated or phosphate-coated screws are standard, while stainless steel offers better corrosion resistance but is usually unnecessary as long as the shelves remain in a dry environment.

Regarding additional fasteners: metal brackets provide a durable solution that significantly increases load capacity, especially if the shelves are exposed to high dynamic stress. In the original factory condition, the connections rely only on screws and dowels (Confirmat screws), which are less tolerant to static stress.

My advice: use screws with at least 4.5 mm (0.18 inches) diameter, 40 mm (1.6 inches) length, coarse threads, and add metal corner brackets. This is the safest and most cost-effective solution for heavy loads.

Leonardteo schrieb:
Screws with at least 4.5 mm (0.18 inch) diameter, 40 mm (1.6 inch) length, coarse thread

I agree with that.

For heavy loads, the most important thing is that the screws have a strong grip and don’t pull out. So better chipboard screws in 5x40 mm (0.2x1.6 inch).

Angle brackets are essential if it really needs to be load-bearing.

Without brackets, the shelf will eventually tilt or sag.