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What Size Allen Wrench for IKEA Furniture: Complete Guide!

When you purchase IKEA furniture, you know that you will need to crack open your toolbox for assembly. Sometimes, the assembly kits include tools, but these are not always of the greatest quality, and in the case of small Allen wrenches, they can get lost.

You will find out everything you need to know about IKEA wrenches, what to do when you lose one and how to find out which type to use. We also put together a table of IKEA’s most frequently used sizes and shapes of hex (Allen) keys.


The most common size Allen wrench used for IKEA furniture is the 4 mm, both the L- and S-shaped hex keys. IKEA also frequently uses 3 mm L-shaped keys, 5 mm L- and S-shaped keys, and the 6 mm L-shaped keys.

Allen Wrenches Included in Assembly Kit

There is no need to worry. You don’t need to buy an Allen wrench kit in order to assemble your new IKEA furniture.

Assembling wood ware. Happy young indian woman flat pack furniture buyer enjoy easy remodeling home making wooden shelf. Biracial lady sit on floor hold allen key mount parts together using hex wrench

Allen wrench with furniture

IKEA, as a brand, is all about convenience, so they make furniture that can be mostly built with standard tools that you are likely to already own, such as different-headed screwdrivers or hammers. Allen wrenches are a little more specialized.

IKEA doesn’t expect you to own a professional toolbox; they provide you with the correct Allen wrench in the assembly kit whenever one is required. This is great, mainly because you don’t have to spend time looking for the right type and size of the wrench, only to build your furniture and never use it again.

Allen wrenches come in many different types, shapes, and sizes. IKEA uses different ones for assembling different furniture or product series.

It can easily happen that after buying a few pieces of furniture in IKEA, you will own a whole collection of Allen keys. It is essential to keep them for when you need to tighten the screws as their grip loosens with time a little.

Why Does IKEA Use Allen Wrenches?

IKEA doesn’t use Allen wrenches exclusively. You will often find products that utilize regular screws with screwdrivers alongside the Allen wrenches.

This may seem a little odd at first. Why do they go to such lengths to provide their customers with free Allen wrenches when they could easily just stick with screwdrivers and save themselves some extra cost?

Well, Allen wrenches provide many benefits that make them worth the trouble. Handling them is very simple, and so they are ideal tools for people with little building experience. You don’t have to use as much strength to use them as you use with screwdrivers due to the 6-point contact, nor do you need any power tools.

Allen wrenches provide a firm grip that protects the fasteners from getting stripped unintentionally, allowing for quick and straightforward installation.

Because these wrenches are so easy to use, you are less likely to get fatigued from using them. They make the installation process much simpler than it would be without them.

IKEA Can Replace Lost Wrenches

In case you happen to lose the Allen wrench that was provided with your furniture, you can contact Ikea and ask for a replacement.

All you need to do is go to your local IKEA store or contact customer service and tell them the make and model of the product the wrench is for. They should be able to send you the accurate wrench either immediately or within a few days.

Alternatively, you can order the tool via their online portal.

This service is typically free, but sometimes you may be asked to pay a small fee. To be sure, ask your local store or customer service for a price estimate.

Knowing Allen Wrench Size Can Be Helpful

Although you can get a wrench replacement from Ikea, owning your own set can come with many advantages. Even if you already have a kit, you still need to know the exact size and type of wrench that you should use.

Handyman concept. Screwdrivers set. Man carries toolbox white background. Worker repairman handyman carrying toolbox. Electrician tools. Furniture makers design and craft individual pieces furniture. allen wrench

Once you have this information, you are ready to start your project. It will spare you the hassle and time of waiting for a new replacement.

So, in which situations is it helpful to know which Allen wrench to use?

  • If someone is helping you. The work will go much faster with two people working together. However, you need a second key for the other person.
  • You want to dismantle a piece of IKEA furniture that you no longer have the Allen wrench for. It is good to have a spare Allen wrench on hand to disassemble the furniture when you are moving house or trying to relocate an item that can’t fit through the door. You should note that disassembling your IKEA furniture can shorten its lifespan.
  • You purchased a second-hand IKEA kit, and it has all the pieces, just not the tools to assemble it. Second-hand or As-is products can be missing the Allen wrench. You will need to know which specific wrench is required when you want to dismantle, tighten or assemble them.
  • Your IKEA is charging you for the spare wrench, but you have a collection at home. If you find an Allen key that matches, you can proceed with your project right away. You don’t have to waste time and money by buying a new wrench.

How to Find out the Right Size Allen Wrench

The good news is that finding which Allen wrench size you need could not be any easier.

To see it online, visit the IKEA store and find your product. Each listed product has multiple sections. Open the section called “Product Details.” There you will find a dropdown titled “Assembly & Documents,” under which is a link to a PDF assembly file.

This file contains image assembly instructions together with images and product numbers of all the tools needed.

Find the product number of your wrench. To look up the product’s size, either google it by writing “IKEA product number” (it should be presented in one of the top 5 results) or by contacting their customer service.

Alternatively, you can try looking in your printed manual if you still have it.

Keep in mind that IKEA is a European company, and so they use metric instead of imperial units. Also, they usually use Pozidriv screwdrivers, not Phillips.

IKEA tends to use the same sized wrenches for different types of items and product series, so we have tabulated the most common Allen wrench sizes needed for the most common categories of IKEA furniture.

What Size Allen Wrench for Ikea?

Common Allen Wrench SizesShape of Allen WrenchProduct Number(s)Other Tools Needed
Bed Frames4 mm
4 mm
4 mm
 
5 mm
6 mm
S-shaped hex key
L-shaped hex key
Long ball-end L-shaped hex key
L-shaped hex key
L-shaped hex key
100001
100092
130445
 
108490
100049
Slotted screwdriver
Cross slot screwdriver
Curved claw hammer
Sofas5 mm
13 mm
L-shaped hex key
Hollow wrench
108490
120202
Armchairs4 mm
4 mm
S-shaped hex key
L-shaped hex key
100001
100092
Slotted screwdriver
Cross slot screwdriver
Bookcases3 mm
4 mm
4 mm
L-shaped hex key
S-shaped hex key
L-shaped hex key
100006
100001
100092
Typically:
Slotted screwdriver
Cross slot screwdriver
Spirit level

Occasionally:
Curved claw hammer
Shelving Units4 mm
4 mm
S-shaped hex key
L-shaped hex key
100001
100092
Typically:
Slotted screwdriver
Cross slot screwdriver
Spirit level

Occasionally:
Curved claw hammer
Tables4 mm
4 mm
5 mm
S-shaped hex key
L-shaped hex key
L-shaped hex key
100001
100092
108490
Typically:
Slotted screwdriver

Occasionally:
Cross slot screwdriver
Curved claw hammer
Desks4 mm
4 mm
5 mm
6 mm
L-shaped hex key
S-shaped hex key
L-shaped hex key
L-shaped ball head hex key
100092
100001

108490
124325
Typically:
Slotted screwdriver
Cross slot screwdriver

Occasionally:
Spirit level
Curved claw hammer
Awl
Chairs4 mm
5 mm
6 mm
S-shaped key
L-shaped hex key
L-shaped ball head hex key
10083377
124345
124325
Typically:
Slotted screwdriver
Cross slot screwdriver

Occasionally:
Awl
Cabinets4 mm
4 mm

6 mm
S-shaped hex key
Long ball-end L-shaped hex key
L-shaped hex key
100001
130445

100049
Typically:
Slotted screwdriver
Cross slot screwdriver
Spirit level

Occasionally:
Curved claw hammer
Awl
Clamp
Wardrobes3 mm
4 mm
5 mm
L-shaped hex key
S-shaped hex key
S-shaped hex key
100006
100001
100002
Typically:
Slotted screwdriver
Cross slot screwdriver
Spirit level
Curved claw hammer
Measure

Occasionally:
Awl
Drill
Step ladder
Drawer Sets3 mm
4 mm
L-shaped hex key
S-shaped hex key
100006
100001
Typically:
Slotted screwdriver
Cross slot screwdriver
Spirit level
Curved claw hammer

Occasionally:
Awl
Drill
TV and Media Furniture3 mm
4 mm
4 mm
L-shaped hex key
L-shaped hex key
S-shaped hex key
100006
100092
100001
Typically:
Slotted screwdriver
Cross slot screwdriver
Spirit level
Curved claw hammer

Occasionally:
Drill
Outdoor Furniture4 mm
4 mm
4 mm

5 mm
S-shaped hex key
L-shaped hex key
Long ball-end L-shaped hex key
L-shaped hex key
100001
100092
130445

108490
Typically:
Slotted screwdriver
Cross slot screwdriver

Occasionally:
Curved claw hammer

Need to Buy Some of the Tools?

ToolAmazon link
 Allen key setView and View
Slotted ScrewdriverView
Curved claw hammerView
Spirit levelView
AwlView
DrillView
Step ladderView
ClampView

Sources

https://www.ikea.com/us/en/

https://monroeengineering.com/blog/what-is-an-allen-key/

https://thomaspark.co/2020/09/the-ikea-packout/

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