T Nuts, D Nuts & Fixings

Furniture T Nuts, D Nuts and Leg Fixings

Shop furniture T nuts, D nuts and threaded leg fixings for furniture manufacturing, upholstery, repair and restoration. Livedale supplies M8 and M10 threaded inserts, three-point fixing nuts, angled leg brackets, wood-to-metal dowel screws and serrated furniture-leg washers for fitting compatible wooden and metal legs, feet and glides.

These fittings create or support a threaded connection within a suitable furniture frame. They allow legs and feet to be fitted securely while remaining removable for delivery, repair or replacement.

The correct fitting depends on the furniture construction, timber thickness, thread size and direction from which the component will be installed. An M8 leg requires a compatible M8 fixing, while an M10 leg requires an M10 fixing. The two sizes are not interchangeable.

Measure the existing thread and fixing before ordering. A component that appears to be roughly the correct diameter may begin to engage before damaging both threads.

Shop Threaded Furniture Fixings by Type

The range contains five principal product groups:

• M8 and M10 T nuts
• M8 and M10 D nuts
• M8 three-point fixing nuts
• M8 angled furniture-leg brackets
• M8 dowel screws and serrated washers

There are no further child categories beneath this page, so the sections below organise the eight available products by fixing type and furniture application.

Furniture T Nuts

Furniture T nuts create a threaded anchor within suitable timber or compatible furniture-frame material.

The current range includes:

• M8 T nuts
• M10 T nuts

Each fitting has an internally threaded barrel and a broad flange with four prongs.

The barrel passes through a correctly sized hole, while the prongs grip the surrounding timber and help prevent the nut from turning when a furniture leg, glide or threaded component is installed.

Potential applications include:

• Wooden furniture legs
• Metal furniture legs
• Sofa and chair feet
• Footstools
• Bed bases
• Upholstered benches
• Headboard and frame components
• Knock-down furniture
• Removable furniture fittings
• Suitable production furniture

T nuts are normally most effective when installed from the reverse of the timber so that tightening the leg or bolt pulls the flange against the frame.

M8 T Nuts

The M8 T nut has an internal M8 metric thread.

The live product description gives an approximate barrel length of 11mm.

It is intended to create a fixing point for compatible M8 furniture legs, glides or threaded components.

Before fitting, check:

• Internal thread is M8
• Barrel length suits the timber
• Flange can sit flat
• Hole diameter matches the barrel
• Prongs enter sound material
• Sufficient timber surrounds the hole
• The leg has a compatible M8 thread
• The threaded section is long enough
• The fitting will be installed from the correct side

Do not fit the T nut where its barrel or prongs will project through a visible furniture surface.

M10 T Nuts

The M10 T nut has an internal M10 metric thread.

It provides a larger threaded connection for compatible M10 furniture legs, feet and other components.

The product appears to have an approximately 12mm barrel, although that measurement should be checked and stated clearly on the individual product page before it is relied upon for production.

Choose M10 only where the mating component has the matching thread.

An M10 fitting is not simply a stronger replacement for an M8 fitting. Changing from M8 to M10 may require:

• A larger hole
• More surrounding timber
• A different furniture leg
• A different mounting position
• Additional frame clearance
• Modification of the existing furniture construction

Where repairing existing furniture, retaining the original thread size is normally the simplest and safest approach.

Installing a Furniture T Nut

Mark the centre of the required fixing carefully.

Drill a hole suitable for the barrel diameter rather than the outside diameter of the flange or prongs.

The hole should be:

• Square to the timber
• Cleanly drilled
• Free from loose fibres
• Large enough for the barrel
• Small enough to prevent movement
• Positioned away from split or damaged timber
• Surrounded by adequate material

Offer the fitting to the hole and check that the flange will sit flat.

Tap the T nut into position using a suitable hammer or mallet, supporting the timber so it does not split or bounce.

Apply pressure evenly across the flange. Avoid striking only one side and driving the barrel into the timber at an angle.

Where possible, draw the fitting firmly into place using a compatible bolt and washer rather than relying entirely on heavy hammering.

Preventing T Nuts from Turning

The four prongs are intended to grip the timber and resist rotation.

A T nut may still turn if:

• The hole is oversized
• The timber is damaged
• The material is too thin
• The prongs have not seated
• The fitting was installed at an angle
• The mating thread is damaged
• The leg is cross-threaded
• Excessive force is applied
• The timber has crumbled around the hole

Do not keep tightening a spinning T nut. This generally enlarges the hole and damages the surrounding material.

Remove the fitting and repair or reinforce the mounting point before trying again.

Furniture D Nuts

D nuts are threaded inserts installed into a prepared hole in suitable timber.

Unlike a T nut, which has a rear flange and prongs, a D nut has a coarse external thread that grips the wall of the drilled hole.

The current range includes:

• M8 D nuts
• M10 D nuts

The fitting is installed using a compatible hex key or installation tool, leaving an internal metric thread ready to receive a furniture leg, glide or bolt.

D nuts can be particularly useful where:

• The reverse of the frame is inaccessible
• A flush or recessed insert is required
• The fitting must be installed from the same side as the leg
• A replaceable threaded fixing is required
• The furniture design does not suit a rear-flanged T nut
• The frame provides sufficient depth for the insert

M8 D Nuts

The M8 D nut has an internal M8 thread and is described as approximately 20mm long.

It is intended for compatible M8 furniture legs, feet, glides and threaded fittings.

The longer insert requires sufficient timber depth.

Before installation, check:

• Timber thickness
• Required hole depth
• External insert diameter
• Internal M8 thread
• Hex-key or tool size
• Distance from the timber edge
• Position of surrounding screws
• Required finished depth

Do not drill through the visible side of a furniture rail or panel.

Mark the required hole depth on the drill bit or use a depth stop.

M10 D Nuts

The M10 D nut has an internal M10 thread and is described as approximately 13mm long.

It provides a larger internal thread than the M8 product but appears to use a shorter insert body.

The correct choice depends on both the mating thread and available timber depth.

Check the complete specification rather than assuming that the M10 product will be longer or physically larger in every dimension.

Installing a D Nut

Drill the correct pilot hole to the required depth.

The hole should be straight and clean. A hole drilled at an angle will cause the inserted leg or bolt to sit incorrectly even where the D nut itself appears secure.

Start the D nut carefully and use the correct hex key or installation tool.

Turn it progressively into the timber without forcing it.

Stop when the flange sits at the intended depth.

Avoid driving the insert below the surface unless the product and furniture design specifically require it.

The flange helps:

• Control installation depth
• Spread load around the hole
• Reduce the risk of surface splitting
• Prevent the insert being driven excessively far
• Provide a neat finished position

Do not continue turning after the flange is firmly seated. Excess force can strip the timber surrounding the external thread.

T Nuts or D Nuts: Which Should You Choose?

Both products create a metric threaded fixing, but they use different installation methods.

Choose a T nut where:

• The reverse of the timber is accessible
• A broad rear flange can sit against the frame
• Tightening the leg will pull the fitting into the timber
• The prongs can enter sound material
• A simple production fixing is required
• The frame thickness suits the barrel length

Choose a D nut where:

• The reverse is inaccessible
• The fitting must be installed from one side
• A recessed threaded insert is required
• The timber provides adequate depth
• A coarse external thread can grip securely
• A flange-controlled installation is preferred

Neither fixing is automatically superior.

A well-installed M8 T nut in sound timber can outperform an unsuitable M10 D nut fitted into an oversized or shallow hole.

Choose according to the furniture structure rather than thread size alone.

M8 Three-Point Fixing Nuts

The M8 three-point fixing nut creates a permanent threaded anchor for compatible furniture feet and legs.

It contains:

• An internal M8 thread
• A central barrel
• Three surrounding screw holes
• A broad mounting plate

The fitting is inserted into a prepared hole and then secured with three additional screws.

This mounting arrangement can provide a useful alternative where a basic T nut or D nut is unsuitable.

Potential applications include:

• Sofa legs
• Chair feet
• Footstools
• Furniture bases
• Upholstered benches
• Bed and headboard components
• Repeated furniture production
• Replacement of a compatible original plate

Benefits of a Three-Point Fixing

The additional screw holes can help:

• Resist rotation
• Spread load over a wider area
• Secure the fitting to the frame
• Reduce dependence on an interference fit
• Provide a visible and inspectable fixing
• Support repeated removal of a compatible leg

The three screws must enter sound timber.

The plate should sit flat without rocking or bridging across an uneven frame surface.

The fixing is only as secure as the timber and screws supporting it.

Installing a Three-Point Fixing Nut

Position the fitting and mark:

• Central hole
• Three screw positions
• Direction of the furniture leg
• Clearance around the plate
• Distance from frame edges
• Relationship with upholstery materials

Drill the central hole to suit the insert barrel.

Drill appropriate pilot holes for the three screws.

Fit the plate squarely and tighten the screws progressively.

Do not fully tighten one screw while the remaining two are loose, as this can pull the plate out of alignment.

Check that the M8 thread remains square to the furniture base before fitting the leg.

M8 Angled Furniture-Leg Brackets

The M8 furniture-leg angled bracket allows a compatible M8 threaded leg to be fitted at a deliberate angle.

This is useful where splayed legs form part of the furniture design.

Potential applications include:

• Sofas
• Lounge chairs
• Footstools
• Upholstered benches
• Occasional furniture
• Mid-century-style furniture
• Furniture requiring an outward leg position

The bracket accepts an M8 threaded leg.

The angle, plate dimensions and fixing-hole positions should be stated clearly on the product page so customers can confirm suitability before ordering.

Planning Splayed Furniture Legs

An angled leg changes how the furniture load is transferred into the frame.

Before installation, consider:

• Direction of the splay
• Front and rear leg positions
• Furniture width
• Leg length
• Floor contact
• Frame thickness
• Available fixing area
• Screw length
• Upholstery clearance
• Finished stability

All matching brackets should be fitted at consistent angles.

The front pair and rear pair may need different orientations depending on the design.

Mark each bracket position before drilling and check the direction from above and below.

One bracket facing the wrong way can leave a furniture leg making an unexpected bid for independence.

Fixing an Angled Bracket

Attach the bracket to sound structural timber.

Do not fix it solely to:

• Upholstery cardboard
• Thin fibreboard
• Base cloth
• Decorative panel board
• Foam
• Fabric
• Damaged particle board

Use screws that suit the bracket holes, timber thickness and expected furniture load.

The screws must not pass through the visible frame or interfere with springs, webbing or other upholstery components.

Fit the leg and place the furniture upright on a level surface before completing the upholstery finish.

Check:

• All legs contact the floor
• The furniture does not rock
• The brackets remain tight
• The legs point consistently
• The frame is level
• No leg fouls another component

M8 Wood-to-Metal Dowel Screws

The M8 wood-to-metal dowel screw is approximately 70mm long.

One half has a wood-screw thread, while the other half has an M8 machine thread.

The wood-threaded section is fitted into a suitable wooden furniture leg or frame component, leaving an M8 stud available to engage with a T nut, D nut, mounting plate or compatible bracket.

Potential applications include:

• Wooden sofa legs
• Chair feet
• Footstools
• Replacement furniture legs
• Timber components requiring an M8 stud
• Custom furniture manufacture
• Repairing a damaged or missing threaded leg fitting

Installing a Dowel Screw into a Wooden Leg

Mark the exact centre of the leg.

A dowel screw installed off-centre can cause the leg to rotate unevenly and may reduce the surrounding timber thickness on one side.

Drill a suitable pilot hole for the wood-threaded section.

The pilot hole should:

• Be square to the leg
• Follow the leg centre line
• Suit the timber species
• Be deep enough for the wood thread
• Leave sound timber around the screw
• Avoid splitting the leg

Install the dowel screw using an appropriate method that does not damage the exposed M8 machine thread.

Avoid gripping the metric thread directly with ordinary pliers.

Damaged machine threads can be difficult to start and may ruin the receiving nut or bracket.

Setting the Exposed Thread Length

The exposed M8 section must be long enough to engage securely with the receiving fixing without bottoming out prematurely.

Check:

• Depth of the receiving thread
• Thickness of any washer
• Bracket or frame thickness
• Required furniture-leg position
• Whether the leg must tighten against the frame
• Clearance around the stud

Where too much thread remains exposed, the furniture leg may not pull firmly against the base.

Where too little is exposed, the thread may engage only partially.

Test the complete leg-and-fixing assembly before producing or upholstering multiple furniture frames.

Serrated Furniture-Leg Washers

The 50mm serrated plastic washer is approximately:

• 50mm in diameter
• 4mm thick

It is used between a compatible wooden furniture leg and the underside of the furniture.

The washer can help:

• Reduce movement
• Resist the leg working loose
• Spread contact across a wider area
• Protect the upholstery fabric beneath the frame
• Prevent the top of the leg rubbing directly against the covering
• Provide separation between the leg and furniture base

The serrated surface increases friction between the adjoining components.

Positioning a Furniture-Leg Washer

Place the washer centrally around the threaded stud.

It should sit flat between the furniture leg and the underside of the frame.

Check that:

• The centre opening suits the thread
• The washer does not obstruct the fixing
• The furniture leg still engages fully
• The washer does not distort the mounting bracket
• The top of the leg contacts it evenly
• Upholstery fabric is not trapped or gathered beneath it

A washer cannot compensate for a loose insert, damaged thread or badly aligned leg.

Correct the primary fixing before adding the washer.

Understanding M8 and M10 Threads

The letter M identifies a metric screw thread.

The number indicates its nominal outside diameter in millimetres:

• M8 is nominally 8mm
• M10 is nominally 10mm

This does not mean that every dimension of an M10 fixing is exactly 2mm larger than its M8 equivalent.

Products can also differ in:

• Thread pitch
• Barrel length
• External insert diameter
• Flange diameter
• Plate dimensions
• Hole requirement
• Overall length

Where replacing an existing component, verify both the diameter and thread pitch.

Do not mix metric and imperial threads because they appear close.

A mismatched thread may begin to engage and then bind, damaging both the furniture leg and fixing.

Measuring an Existing Furniture-Leg Thread

Where possible, remove one undamaged leg and fixing for comparison.

Measure:

• Thread outside diameter
• Thread pitch
• Exposed stud length
• Total stud length
• Diameter of the furniture insert
• Insert depth
• Plate dimensions
• Hole spacing
• Washer diameter
• Leg shoulder diameter

A thread gauge provides the most reliable thread-pitch check.

Where one is not available, compare the component carefully with a confirmed M8 or M10 nut without forcing it.

Begin the thread by hand.

A compatible fitting should engage smoothly for several turns.

Choosing a Fixing for a New Furniture Leg

Begin with the furniture frame.

Check:

• Timber type
• Timber thickness
• Access to the reverse
• Available fixing area
• Position of springs and webbing
• Upholstery thickness
• Direction of the leg
• Expected furniture load
• Whether the leg must be removable
• Whether the fitting will be installed during production or repair

Then select the leg thread and compatible fixing system.

A typical arrangement might use:

• An M8 dowel screw in a wooden leg
• An M8 T nut in the furniture frame
• A serrated washer between the leg and frame

Another design may use:

• A ready-threaded M8 leg
• An angled M8 bracket
• Appropriate frame screws

A third may use:

• A threaded leg
• A D nut installed from the visible fixing side
• No access to the reverse of the frame

Plan the system as a whole rather than ordering each component independently.

Replacing a Loose Furniture Leg

A loose leg can be caused by more than an unscrewed thread.

Inspect:

• Leg thread
• T nut or D nut
• Mounting bracket
• Washer
• Frame timber
• Screw holes
• Furniture joint
• Leg shoulder
• Previous adhesive
• Alignment

Possible faults include:

• Threaded insert rotating
• Split furniture rail
• Bent threaded stud
• Stripped internal thread
• Missing washer
• Loose mounting screws
• Dowel screw pulling from the leg
• Leg not tightening against the frame
• Incorrect replacement thread
• Damaged particle board

Do not simply add adhesive to the thread unless the furniture design and selected product specifically call for a thread-locking compound.

A removable leg glued permanently into a damaged insert may become a considerably less convenient repair later.

Repairing a Spinning T Nut

Where a T nut rotates within the frame:

1. Remove the furniture leg carefully.
2. Expose the rear of the fixing where possible.
3. Inspect the prongs and timber.
4. Remove the T nut.
5. Repair or reinforce damaged material.
6. Check the hole diameter.
7. Fit a suitable replacement.
8. Draw it firmly into position.
9. Test with a compatible bolt.
10. Refit the leg only after the fixing is secure.

Where the timber is badly damaged, a larger insert is not automatically the answer.

The frame may require:

• A hardwood repair block
• Replacement rail
• Bonded timber insert
• Properly secured mounting plate
• Relocation of the fixing
• Professional structural repair

Furniture Frames and Board Materials

Threaded leg fixings rely on the surrounding furniture material.

Solid timber and suitable plywood generally provide better structural fixing opportunities than thin hardboard, fibreboard or damaged particle board.

Where manufactured board is used, check:

• Board thickness
• Density
• Condition
• Distance from the edge
• Whether the fixing was designed for that material
• Expected load
• Existing manufacturer reinforcement

A category description should not state that every T nut or D nut is automatically suitable for MDF or board.

Suitability depends on the material grade, thickness, insert design and furniture load.

Pilot Holes

A correctly sized pilot hole helps:

• Position the fitting
• Reduce splitting
• Keep the thread square
• Control insertion depth
• Protect the surrounding timber
• Improve repeatability in production

A hole that is too small may split the timber or prevent the insert seating correctly.

A hole that is too large may allow the fitting to spin, pull out or sit at an angle.

Test the hole size in a piece of equivalent timber before drilling a finished furniture frame where the exact requirement is uncertain.

Installing Fixings Squarely

A furniture-leg fixing should normally be installed square to the intended leg direction unless an angled bracket is deliberately being used.

Check alignment from more than one direction.

A fitting that is only a few degrees out can cause:

• The leg to sit crooked
• Uneven floor contact
• Furniture rocking
• Additional stress on the frame
• A visible gap at the leg shoulder
• Difficulty starting the thread
• Damage when the leg is tightened

For repeated production, use a drilling jig or template rather than marking every frame independently.

Tightening Furniture Legs

Start the leg thread by hand.

It should turn freely without binding.

Tighten the leg until its shoulder or washer sits firmly against the furniture base.

Do not overtighten.

Excessive force can:

• Strip the insert
• Split the timber
• Twist the dowel screw
• Damage the leg shoulder
• Distort an angled bracket
• Crush upholstery fabric
• Pull a T nut through weakened material

Check leg tightness after the furniture has been transported and again after initial use where appropriate.

Furniture frames and upholstery layers can settle slightly.

Checking Furniture Stability

After fitting the legs:

• Place the furniture on a level surface
• Confirm all legs contact the floor
• Check the frame is level
• Apply controlled pressure
• Check for rocking
• Inspect each bracket
• Confirm threads remain tight
• Check washers sit flat
• Make sure legs point consistently
• Recheck after moving the furniture

Do not attempt to correct a badly aligned leg merely by adding multiple washers or unscrewing it several turns.

The threaded engagement and frame fixing must remain adequate.

Removing Furniture Legs for Delivery

Removable legs can reduce furniture height and make delivery through doors or stairways easier.

Before removal:

• Label each leg position
• Photograph angled-leg orientation
• Protect exposed threaded studs
• Keep washers with the correct legs
• Store loose fittings in a labelled bag
• Avoid dragging the frame on exposed brackets
• Do not place the furniture weight on protruding inserts
• Refit the legs before normal use

Where the front and rear legs differ, mark them clearly.

A set of four unlabelled legs often becomes surprisingly democratic about which corner each belongs to.

Related Furniture Hardware

This category contains threaded inserts and leg-mounting hardware only.

For wooden headboard struts, wall-mount brackets and sectional-furniture connectors, browse Headboard Struts & Furniture Connector Brackets.

For ottoman hinges, gas-assisted fittings, recliner cables and rocker springs, browse Ottoman Hinges & Furniture Mechanisms.

Return to the parent Furniture Fixings & Brackets category to compare all three furniture-hardware sections.

Browse wooden furniture feet and metal furniture feet for compatible furniture-leg options.

Explore professional upholstery tools for drilling, measuring, marking and furniture-repair equipment.

Browse PVA and hot melt adhesives for suitable timber and furniture-assembly work.

Explore the complete Workroom Supplies range for upholstery threads, tapes, panels, adhesives and other furniture-making essentials.

Trade Furniture T Nuts and Leg Fixings

Livedale supplies M8 and M10 T nuts, D nuts, fixing plates, furniture-leg brackets, dowel screws and serrated washers to professional upholsterers, furniture manufacturers, bed makers, repair workshops and other trade customers throughout the UK.

Most threaded inserts and associated fittings are available in workroom or production pack quantities, making them suitable for repeated furniture manufacture as well as individual repair projects.

Approved trade customers can access preferential trade pricing across eligible products after registering for a trade account.

Select the fitting by thread, dimensions, installation method and furniture construction rather than appearance alone.