what screws do i need for ikea lack shelf

IKEA Lack Shelf: Essential Screws You Need

By Joseph MillerDecember 12, 2025

So, you've decided to assemble the stylish and functional IKEA LACK shelf? Great choice! But before you dive into the DIY project, you might be wondering, "What screws do I need for IKEA LACK shelf?" We've got you covered with this comprehensive guide.

First things first, let's understand the LACK shelf's design. It's a simple, minimalist bookshelf with adjustable shelves, perfect for small spaces. The assembly process is straightforward, but it's crucial to use the correct screws to ensure stability and longevity.

Understanding IKEA's Screw Sizes

IKEA uses a standard screw size for most of their furniture, including the LACK shelf. Knowing this size will help you identify the right screws.

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For the LACK shelf, you'll primarily need:

Panhead Screws (PH) - 3x16mm: These are the most common screws used in IKEA furniture. They have a flat, round head and are 16mm long with a 3mm thread.
Countersunk Screws (TR) - 3x12mm: These screws have a slightly smaller head that sits flush with the surface when tightened. They are 12mm long with a 3mm thread.

Screws for the Main Frame

The LACK shelf's main frame uses the PH-3x16mm screws. These are used to connect the vertical and horizontal supports, as well as attach the shelf brackets.

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You'll need 12 of these screws in total. The assembly instructions should guide you on where to place each screw.

Screws for the Adjustable Shelves

The adjustable shelves use the TR-3x12mm screws. These are used to attach the shelf supports to the main frame.

You'll need 8 of these screws in total. Again, follow the assembly instructions for the correct placement.

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What if You're Missing Screws?

Don't panic if you're missing a few screws. IKEA furniture is designed with this in mind, and you can usually make do with what you have.

However, if you're really stuck, you can always order replacement parts from IKEA. They offer individual screws and other hardware for their furniture. Just have your product ID (found on the assembly instructions or your purchase receipt) ready.

Can You Use Different Screws?

While it's technically possible to use different screws, it's not recommended. The screws IKEA provides are designed to fit perfectly with their furniture, ensuring stability and longevity.

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Using different screws could lead to instability, damage to the furniture, or even injury. So, it's best to stick with the screws provided or recommended by IKEA.

Now that you know what screws you need for your IKEA LACK shelf, it's time to grab your toolkit and get building! Happy assembling, and remember, if you have any doubts, always refer to the assembly instructions. They're there to help!