ᐅ Which screws are more durable than the original BILLY screws?

Created on: 7 Dec 2024 09:37
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ratipeo
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ratipeo
7 Dec 2024 09:37
Hello everyone,

I have a question regarding the screws used for the Ikea Billy bookshelf, specifically those included as "original BILLY screws" in the package. I have noticed that these screws sometimes rust or loosen over time, which affects the stability of the shelf. Therefore, I would like to ask: which screws are more durable than the original BILLY screws if you want to assemble the shelf for long-term and secure use?

I am particularly interested in which materials, surface treatments, or types of screws have proven effective in minimizing corrosion, material fatigue, and wood tension. If anyone also has experience with specific screw lengths or diameters, that would be very helpful.

I look forward to well-founded recommendations and experiences!
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nubar
7 Dec 2024 10:02
Hello ratipeo,

from my experience, galvanized screws, especially those with a higher-quality coating (electro-galvanized or hot-dip galvanized), are more durable than the standard black original BILLY screws.

Additionally, stainless steel screws (e.g., A2 or better A4) provide significantly better corrosion resistance, particularly if the shelf is placed in slightly more humid environments. It is also important to use suitable wood-thread screws that do not cut too aggressively, thus minimizing damage to the wood.

Stainless steel is more expensive but clearly more beneficial in the long run.
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Paunon
7 Dec 2024 10:45
I would recommend stainless steel screws for BILLY shelves, preferably A2 or A4. Zinc-plated screws also work but are not as durable, especially in damp conditions.
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Filippo
7 Dec 2024 11:11
Hello everyone,

I would like to approach this question from a more technical perspective, as the durability of screws used in furniture like the BILLY shelf depends not only on the material but also on the proper fit, surface treatment, and the environment.

First, regarding the material: The original BILLY screws are mostly made of steel with a black coating, likely a zinc-phosphate treatment. This coating offers limited corrosion protection. In dry indoor conditions, this may be sufficient, but in areas with higher humidity or occasional exposure to moisture, weaknesses can occur.

Stainless steel screws of grade A2 (also called V2A) provide good corrosion resistance indoors. For more demanding applications, such as where there are greater fluctuations in humidity, A4 (V4A) stainless steel is recommended, as it can also withstand salty air, for example.

Besides the material, the shape of the screw is important: wood screws with an appropriate thread that minimizes crushing of the wood fibers and grips well increase load-bearing capacity and prevent the screw from loosening over time.

A key recommendation is to pre-drill holes to avoid cracks in the wood and to optimize thread engagement. If desired, a bit of wood glue and sealant can be applied to help keep the wood stable.

Are you planning to rearrange the shelves or sides frequently? Then screws with a special thread that remain tight yet removable after multiple assemblies might be part of the solution.

Perhaps you could provide more details about the environment where the shelf will be used: Is it located in heated rooms, or are there sources of moisture? Will it be subjected to loads or transportation?
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ratipeo
7 Dec 2024 11:53
Filippo schrieb:
Maybe you could provide a bit more information about your usage environment

Good point! The shelf is actually located in a heated living room, so the air is relatively dry. However, I have two cats who sometimes scratch it with wet paws, and the shelf is placed near a window where light condensation can occasionally occur. Additionally, I plan to disassemble and reassemble the shelf at least once in the next few years because I will be moving.

So, the screws should not only be corrosion-resistant but also able to withstand repeated assembly and disassembly.
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Nabla64
7 Dec 2024 14:08
Hello ratipeo,

Based on your additional information, I have summarized a few points and provided a brief step-by-step recommendation for durable screws for the BILLY shelf:

1. Material: Stainless steel A2 is ideal for indoor use with slight moisture. The cost is reasonable, and the corrosion resistance is significantly better compared to the original coating.

2. Surface: Avoid screws with plain black phosphate coating, as they are very prone to rust, especially if the surface gets scratched.

3. Thread: Wood screws with coarse threads for softwood (like the pine used in BILLY) grip better and prevent quick loosening.

4. Screw size: The original screws are usually 4 mm (0.16 inches) in diameter; under longer loads, 4.5 or 5 mm (0.18 or 0.2 inches) with the appropriate length can improve stability.

5. Pre-drilling: Important during modifications, pre-drilled holes cause less damage and allow screws to be reused multiple times without loss of holding strength.

6. Reusability: Stainless steel is more resistant to wear in the threads and provides better grip when screws are installed and removed repeatedly.

Conclusion: For your case, I recommend high-quality stainless steel wood screws in the correct size that also allow pre-drilling. This way, you ensure stability and long-lasting durability.