ᐅ Which screws are more durable than the original ones used in BILLY?

Hello everyone,

I recently reinforced my BILLY shelving frame and noticed the original screws, which I would like to replace due to slight rusting and material fatigue. My specific question is: Which screws are more durable than the original ones used by IKEA in their BILLY shelving units?

I am interested in both the material quality (e.g., stainless steel, galvanized, etc.) and strength (e.g., strength class). Perhaps you have experience to share—especially regarding the type of screws or coatings that work particularly well with BILLY to ensure long-term stability.

Thanks in advance for your tips!

Adolfosar schrieb:
My specific question is: Which screws are more durable than the original screws that IKEA uses for their BILLY bookshelf?

Basically, IKEA uses simple galvanized steel screws for BILLY bookshelves, usually strength class 4.8 or similar. These are cost-effective and resistant to light rust, but not ideal for long-term use, especially if the shelves are placed in damp rooms or moved frequently.

For a more durable alternative, I recommend stainless steel screws, particularly A2 or even better A4 stainless steel. These offer significantly better corrosion resistance, are mechanically strong, and remain visually appealing even after extended use.

The strength class is also important: for wood connections like those in the BILLY, classes 5.8 or 8.8 are sufficient; higher-quality screws better withstand the load. However, you should make sure the screw size fits, as the BILLY shelf is designed for pre-drilled holes.

If you want to switch to metric screws, M4 or M5 with hex head or Phillips head could work well—preferably with fine threads for secure grip in chipboard.

Now a question for you: Where exactly is your shelf located, and are there any special requirements (e.g., extra weight, moisture) so I can tailor the advice better to your environment?

I have switched to stainless steel screws (A2) on my BILLY, which definitely lasts longer. M4x30 or M5 are best, depending on the hole size.

Gafiel schrieb:
If you want to switch to metric screws, M4 or M5 with a hex head or Phillips drive might work well

I agree with that. Stainless steel A2 is an easily available and durable alternative to the original screws.

I believe that with shelves like BILLY, not only the screws themselves matter, but also how tightly they are fastened.

Adolfosar schrieb:
Maybe you have some experiences to share – also regarding the type or coating of screws

If the screws are too loose, even the best screw won't help.

I personally chose stainless steel screws because I wanted to be quite sure I wouldn't have to replace them every two years. That gives a good feeling. It can be a bit more expensive at first, but it's worth it in the long run. I sometimes struggle with motivation too, but keep at it; it pays off. 🙂