Furniture Feet M8 vs M10: Which Thread Do You Need?

July 26, 2026

A furniture foot with an M8 thread is suitable for light to medium-weight furniture, whilst an M10 thread is designed for heavy loads such as sofas, beds, or large wardrobes.

When building or repairing furniture, the question of correctly dimensioning the load-bearing components inevitably arises. The thread on a furniture foot is the direct interface between the floor and the furniture carcass. It must not only carry the static weight of the furniture and its contents, but also absorb dynamic forces created when shifting, sitting, or leaning. The choice between an M8 thread and an M10 thread decisively determines the stability and durability of the connection.

What is an M8 Thread on Furniture Feet?

The abbreviation M8 stands for a metric ISO thread with a nominal diameter of 8 mm. In the furniture industry, the standard coarse thread with a thread pitch of 1.25 mm is used almost exclusively.

Furniture feet with an M8 fitting are the standard for a wide variety of domestic and office furniture items. The steel bolt with an 8 mm diameter offers sufficient tensile strength and shear strength for constructions that are not exposed to extreme loads.

Typical applications for M8 furniture feet include:

Chests of drawers and sideboards
Light to medium-weight cabinets (e.g. bathroom furniture or hallway units)
Coffee tables and side tables
Armchairs and light chairs

To fasten an M8 furniture foot into engineered wood panels (such as chipboard or MDF), a matching counterpart is required in the carcass. This is usually achieved via a threaded insert, which is screwed or hammered into a pre-drilled hole in the base of the furniture.

What is an M10 Thread on Furniture Feet?

The M10 thread has a nominal diameter of 10 mm. Here, too, metric coarse thread is used for furniture feet, featuring a pitch of 1.5 mm on an M10 size.

The jump from 8 mm to 10 mm in diameter may appear small on paper, but it has significant physical consequences. The cross-sectional area of the threaded bolt increases quadratically. Consequently, the load capacity and, in particular, the resistance against lateral shear forces increase disproportionately. An M10 bolt bends far less easily than an M8 bolt when the furniture piece is pushed across the floor.

Typical applications for M10 furniture feet include:

Sofas, corner suites, and heavy upholstered furniture
Solid wood beds and divan beds
Large, fully loaded wardrobes
Workbenches and heavy kitchen islands

Here as well, installation into the wood is carried out using a suitably larger-dimensioned threaded insert.

Differences: M8 vs M10 in Direct Comparison

The decision for one dimension or the other depends on several technical factors. Here are the exact differences in detail:

Nominal diameter: M8 measures 8 mm on the outside of the thread crests, M10 measures 10 mm.
Thread pitch: M8 has a pitch of 1.25 mm (the distance between two thread crests). M10 has a pitch of 1.5 mm. This means an M10 foot screws 1.5 mm into the mating thread per full rotation.
Core cross-section: The load-bearing core of the bolt (excluding the thread flanks) is significantly more solid on the M10. This is the crucial factor in preventing material failure under load.
Shear force tolerance: When a heavy sofa is moved, leverage acts upon the furniture foot. M10 withstands this bending moment significantly better. An M8 thread can bend or even shear off under the same load.
Space required in the wood: An M10 bolt requires a larger insert. The outer diameter for an M10 threaded insert is often 14 mm to 16 mm, whereas an M8 insert often requires 10 mm to 12 mm drill holes. In very thin furniture panels (e.g. 16 mm chipboard), an M10 insert can weaken the material excessively or split it.

Which Thread Should You Choose for Each Case?

Choosing between M8 and M10 is like choosing the correct wall plug: too small a diameter will pull out under load, whilst too large a diameter is often over-specified and weakens the base material unnecessarily.

When M8 is the Right Choice

If you are planning flat-pack furniture or retrofitting feet to a standard chest of drawers, M8 is usually the most practical technical solution. The thread offers more than enough stability for static loads of up to several hundred kilograms (distributed across four feet). The main advantage lies in the smaller space required. If the base panel of your furniture consists of 16 mm or 18 mm thick chipboard, an M8 threaded insert can be screwed in securely without the risk of the wood bursting at the edges.

When M10 is Strictly Necessary

If you are planning to build a workbench, repair a heavy sofa bed, or construct a solid oak bed, opt for M10. Upholstered furniture is not only heavy, but it is also subjected to high dynamic loads when people drop down onto it. This impact load transfers directly onto the threaded bolts of the furniture feet. On furniture frequently shifted across carpets (high frictional resistance), the 10 mm thick bolt also prevents the feet from bending.

In the Case of Repairs and Replacements

If you wish to replace damaged furniture feet or give an old cabinet a new look, the decision is usually predetermined by the furniture piece itself. You must match the existing internal thread inside the furniture carcass. An M8 foot will not fit into an M10 insert and vice versa. Always measure the diameter of the old threaded bolt beforehand.

Installation and Integration into the Furniture Carcass

For the furniture foot to develop its full load-bearing capacity, the connection to the wooden carcass must be executed properly. A metric thread cannot be screwed directly into wood; it requires an internal thread made of metal.

A threaded insert is used for this purpose. In furniture assembly, two main types are distinguished:

Screw-in insert (threaded bushing): This features a coarse wood thread on the outside and a metric M8 or M10 thread on the inside. It is screwed into a pre-drilled hole using a hex key. It offers extremely high pull-out resistance and is ideal for solid wood and dense engineered boards.
Pronged tee nut: This is driven into a through-hole from the inside (the side opposite the foot). It grips into the wood with prongs. When the furniture foot is screwed in from below, it pulls the nut tighter into the wood. This offers the highest pull-out resistance, but remains visible on the interior of the furniture.

Important during installation: Pay exact attention to the drill diameter specified by the manufacturer for the insert. If you drill too small, the chipboard will split when screwing in the insert. If you drill too large, the insert will spin freely and the furniture foot will have no hold.

FAQ – Frequently Asked Questions

How do I measure whether my old furniture foot has an M8 or M10 thread?

Use a vernier caliper. Measure the outer diameter of the threaded bolt on the furniture foot. If the caliper displays a value between 7.8 mm and 8.0 mm, it is an M8 thread. If the value is between 9.8 mm and 10.0 mm, it is an M10 thread. A simple ruler is often sufficient for a rough estimate, but it can be inaccurate with intermediate sizes.

Can I screw an M8 furniture foot into an M10 thread?

No, that is technically impossible. The bolt simply falls through the oversized hole and the thread does not engage. You must either use a foot with an M10 thread, or remove the old threaded insert in the furniture and replace it with a special reducing bushing (outer M10, inner M8) or a completely new insert.

What do I do if the old M8 thread has torn out of the wood?

If the old insert has broken out of the chipboard, the drill hole is now too large for a new M8 insert. In this case, cleanly drill out the damaged hole to the next size up and install a larger M10 insert. Afterwards, use a new furniture foot with an M10 thread. This is the most stable repair method.

Which drill bit do I need for installation?

This does not depend on the internal metric thread (M8/M10), but on the external diameter of the insert used. An M8 screw-in insert often requires a 10 mm or 11 mm wood drill bit. An M10 insert usually requires a 13 mm or 14 mm drill bit. Always consult the technical specifications of the respective fixing component.