ᐅ Buying Replacement Screws for a BILLY Shelf – How Do I Find the Right Ones?

Hello everyone, I unfortunately lost a few screws from my Billy shelf that I need to replace in order to restore its stability. Since IKEA is known for not selling spare parts individually, I would like to know: How can I find the correct screws for a BILLY shelf if I no longer have the original packaging or assembly instructions? What sizes and types are typically used, and are there any recommended sources where I can purchase suitable replacement screws? I am especially interested in whether there are specific differences in the screws for the various BILLY models, or if a standard set applies. Thanks in advance for your help!

For BILLY shelves, IKEA typically uses chipboard screws with a diameter of 4 mm (0.16 inches) and a length of 35 mm (1.38 inches). You can find these screws at any hardware store. If you don’t know the exact size, simply take the old screws with you for comparison.

Hello bobar47,

Many people underestimate how important the right screws are for IKEA furniture, especially with the BILLY series, which has a fairly simple construction but needs to be stable. Generally, IKEA uses particle board screws for the sides and back panels, as sanjon already mentioned. The length and type vary depending on the component. It’s also worth paying attention to the head shape so that the screws sit flush.

If you no longer have the instructions, you can contact IKEA online directly. Sometimes customer service can provide replacement parts or at least give precise information. Otherwise, visiting larger hardware stores or specialized screw suppliers is worthwhile, as they often offer advice on the appropriate screws.

Additionally, screws that are too long or too thick can split the material. So it’s better to measure carefully or bring a sample before purchasing.

angel schrieb:
Screws that are too long or too thick can split the material.

I completely agree. Additionally, you should make sure that the screws are specifically designed for particleboard. Standard wood screws sometimes cut through the wood, whereas particleboard screws have a fine threaded surface that holds better in the glued wood composite.

Furthermore, BILLY shelves often use so-called connecting fittings with special dowels and screws. Most of these screws are hex-head wood-thread screws, usually 4 mm (approximately 5/32 inch) in diameter and 25 to 35 mm (1 to 1 3/8 inches) long.

If you only want to screw the shelf sides together, many users prefer screws with a Phillips head, as they are easier to drive in. It is important that the screw does not penetrate through the panel wall.

Thanks for the tips!

I’m also curious whether the screws for the back panel (the thin chipboard that closes off the back of the shelf) are different from those for the sides. I assume you need shorter or thinner screws for the back panel, is that correct?

Does anyone know if nails can be used instead of screws for this back panel, or is that a bad idea for stability? I’d appreciate it if someone with experience could share their thoughts.

Hello bobar47,

Very good question – the back panel in BILLY shelves is often only about 3 mm (0.12 inches) thick, usually a thin hardboard. Typically, thinner screws such as sheet metal screws or special thin particleboard screws are used here. Alternatively, some models often use a panel pin, which is slightly shorter and thinner and only lightly secures the back panel.

A typical screw size for the back panel is approximately 3.5 mm (0.14 inches) in diameter and 15-20 mm (0.6-0.8 inches) in length. It is important that the screw is not too thick or too long, as this could split the panel.

Can nails be used? Yes, BILLY shelves are sometimes fixed with small panel pins because the back panel mainly serves for stabilization, while the side panels bear the main load. However, I recommend screws as they are more durable and easier to replace.

Summary:
- Back panel: thinner screws (3.5 mm x 15-20 mm) or panel pins
- Side and cross braces: thicker particleboard screws (4 mm x 35 mm / 0.16 inches x 1.4 inches)

Important: Always pay attention to tolerances to avoid material damage. If possible, measure old screws or bring a sample.