I have 8 Ikea Billy bookcases and I would like to attach them together to make the seam betwen them as narrow as possible.

What sort of screw or fastener is appropriate for particle board?

  • 1
    It would be a bit more tricky (and possibly be a good question for Woodworking), but you might be able to remove one side of every book case so that two neighbouring ones would share it. That'd certainly reduce the seam to a minimum. You could use the spare sides to create more shelves if necessary.
    – duct tape
    Nov 20, 2016 at 0:05
  • 1
    If you tried removing sides you might find that there wouldn't be a way to connect the fixed shelves and/or top and bottom pieces. Better to use the method below I think.
    – dlu
    Nov 20, 2016 at 5:02

2 Answers 2


I am not a big fan of screw threads in particle board.

I would use connecting bolts and caps, which are often included in DIY furniture.

connecting boltconnecting cap

They come in a wide variety of lengths and finishes. Pick the size and style that fit.

 Images and links are illustrative only, not an endorsment of goods or sources. 
  • 1
    Alternate search term: "sex bolts"
    – User95050
    Nov 20, 2016 at 14:30
  • ... or "sleeve bolts".
    – isherwood
    Nov 22, 2016 at 17:37

I would talk to someone at Ikea about this. If you look on their site at Billy bookshelves, when they sell a wider version it is two bookshelves side by side and they do not share a single side piece. It appears to be two separate ones that they have tied together. So they must have a system for doing this and you can get the hardware from them.

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