Accessories, Accessories, Upholstery Supplies
T-Nut 3/8″ Thread x 12mm Long
$1.00
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3/8" thread x 12mm long zinc plated metal T-Nut designed for strong and reliable fastening into timber furniture frames. Commonly used to attach sofa legs, chair feet, castors and structural components, this insert provides a secure threaded fixing point that won’t strip or loosen over time. Features a 4 prong design that bites into the timber for a firm hold, making it ideal for both repairs and new installations. 3/8" Thread Furniture T-Nut Insert – 12mm Length. Designed to suit standard 3/8" bolts commonly used in sofa legs and castors. Requires a 12mm hole and minimum 10mm timber depth for installation. The zinc plated finish offers durability and corrosion resistance for long-term use. Looking for Another Size or Thread Type? We also stock alternative sizes including 5/16" thread options in different lengths. Browse our full range of T-Nuts and furniture fasteners (click here) to find the right fit, or contact us for help choosing the correct size. read more
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- Technical Specifications
- How To
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Description
3/8" Thread T-Nut Insert – 12mm Length for Furniture & Timber Fixings
This 3/8″ thread x 12mm long metal T-Nut is a strong and reliable threaded insert designed for use in timber applications. Zinc plated for durability and corrosion resistance, it provides a secure internal thread that allows bolts to be tightened firmly without damaging the surrounding wood. The 4 prong design ensures a tight grip within the timber, preventing spinning or pull-out during use.
While commonly used in furniture repairs and upholstery work, this T-Nut is a versatile fastening solution suitable for cabinetry, joinery, woodworking projects, and general manufacturing applications where a strong threaded fixing point is required.
Common Uses in Furniture, Upholstery and Beyond
T-Nuts are widely used across furniture and upholstery applications where a secure bolt fixing is needed in timber frames. Typical uses include attaching sofa legs, chair feet, castors, and securing structural components within recliners and lounges.
They are also commonly used for mounting brackets, connectors, and internal hardware where a reliable threaded anchor is required. Beyond furniture, these inserts are suitable for cabinetry, timber fabrication, workshop builds, and a wide range of DIY or trade applications where wood needs to accept a machine thread.
Installation Requirements and Size Guide
This T-Nut features a 12mm long barrel and is designed to suit a 3/8″ thread bolt. Installation requires a hole approximately 12mm in diameter and a minimum timber depth of 10mm to ensure a secure fit.
The 4 prongs are designed to bite into the timber when tapped into place, helping to prevent the insert from rotating or pulling out when tightening bolts. For best results, install from the rear side of the timber panel and ensure the prongs are fully seated into the material.
We also stock alternative sizes including 5/16″ thread options in both shorter and longer lengths. If you’re unsure which size you need, feel free to contact us or browse our full range to find the correct match for your application.
Reliable Fastening Solutions from Sofa Rehab
At Sofa Rehab, we supply quality replacement parts and hardware designed to make repairs easier and more cost-effective. Whether you’re fixing a loose sofa leg, replacing a worn fitting, or working on a custom project, our range of furniture fasteners and components are selected for reliability and ease of use.
If you’re unsure about compatibility or sizing, our team is here to help. We can assist you in identifying the correct part so you can complete your repair with confidence.
DIY Friendly – Replace It Yourself and Save
Installing a T-Nut is a simple process that can be completed with basic tools. With just a drill and a hammer or mallet, you can create a strong threaded fixing point in minutes. No specialised skills are required, making this an ideal solution for DIY furniture repairs and general timber projects.
Fix loose legs, secure fittings, or reinforce worn mounting points yourself and avoid the cost of professional repairs. With our step-by-step guides and support available, you’ll have everything you need to get the job done and enjoy the satisfaction of doing it yourself.
Technical Specifications
Technical Specifications
| Product Type | T-Nut / Tee Nut |
|---|---|
| Thread Size | 3/8″ |
| Barrel Length | 12mm |
| Colour | Silver |
| Finish | Zinc Plated |
| Material | Metal |
| Prongs | 4 Prong Design |
| Required Hole Size | 12mm |
| Minimum Timber Depth | 10mm |
| Installation Type | Press / tap into timber from rear side |
| Typical Uses | Sofa legs, chair feet, castors, connectors, structural components, cabinetry and timber fixings |
| Suitable Bolt Thread | 3/8″ thread bolt |
How To
How To
How To Install a T-Nut in Furniture Timber
Installing a T-Nut is a simple way to create a strong threaded fixing point in timber furniture frames. It is commonly used for attaching sofa legs, chair feet, castors, connectors, and other furniture components that fasten with a bolt.
Before you begin, take a clear photo of the original fitting and surrounding area for reference during reassembly. If you are working on a sofa, recliner, or other heavy furniture item, always practise safe lifting techniques. Get help from another person if needed, lift with care, and avoid placing strain on your back.
Tools and Items You May Need
- Replacement 3/8″ x 12mm T-Nut
- Drill
- 12mm drill bit
- Hammer or rubber mallet
- 3/8″ bolt or the furniture leg/part being fitted
- Marker or pencil
- Safety glasses
Step 1: Access the Mounting Area
Carefully turn the furniture over or position it so you can safely access the timber frame where the T-Nut is being installed. If replacing an old T-Nut, remove the existing furniture leg, castor, or fitting first. Check the timber for damage and clear away any loose wood fragments or debris.
Step 2: Check the Hole Size and Timber Depth
This T-Nut requires a hole approximately 12mm wide and a timber depth of no less than 10mm. If there is no existing hole, measure and mark the correct location before drilling. Make sure the hole is straight and suitable for the barrel length of the T-Nut.
Step 3: Insert the T-Nut
Position the T-Nut so the barrel sits inside the hole and the four prongs rest flat against the timber surface. The T-Nut is usually installed from the inside or rear side of the timber panel so the prongs can bite in as the bolt is tightened from the opposite side.
Step 4: Tap the T-Nut into Place
Using a hammer or rubber mallet, gently tap the T-Nut until the prongs begin to sink into the timber. Make sure it stays straight while seating it. The four prongs are designed to grip into the wood to help prevent spinning, slipping, or pull-out during use.
Step 5: Tighten with the Bolt or Furniture Leg
Insert the matching 3/8″ threaded bolt, furniture leg, castor, or fitting into the T-Nut and tighten it carefully. As it tightens, the T-Nut will pull in firmly and seat fully into the timber. Do not overtighten, especially if the timber is older or softer, as excessive force may damage the surrounding material.
Step 6: Check the Fit and Reassemble
Once installed, check that the T-Nut is secure and does not rotate in the timber. Refit the furniture component and ensure everything is sitting straight and tightened correctly. Compare the finished result with your before photo if needed to confirm correct placement.
Helpful Tip
If you are replacing a missing or damaged T-Nut in a sofa or chair leg mounting point, always check that the bolt thread matches the T-Nut exactly. This version suits a 3/8″ thread bolt. If your furniture uses a different thread size, be sure to choose the correct alternative before installation.
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FAQs
FAQs
How do I know if this is the right size T-Nut for my furniture?
You’ll need to check the thread size of your bolt or furniture leg. This T-Nut suits a 3/8" thread, which is a common size for sofa legs and castors. If your bolt is smaller, such as 5/16", then you’ll need one of our alternative sizes instead.
What size hole do I need to install this T-Nut?
This T-Nut requires a hole approximately 12mm in diameter and a minimum timber depth of 10mm. This ensures the barrel fits properly and the prongs can grip securely into the timber.
Can I use this to repair a loose or stripped sofa leg?
Yes, this is one of the most common uses. If the original fixing has stripped out or no longer holds, installing a T-Nut creates a new, strong threaded anchor point so your sofa leg or castor can be securely reattached.
Will the T-Nut stay in place or can it spin in the wood?
The 4 prong design is made to bite into the timber when installed, helping prevent spinning or slipping. For best results, ensure it is seated properly and tightened firmly using the bolt to pull it fully into place.
Are these only used for furniture repairs?
No, while they are commonly used in sofas, chairs, and cabinetry, T-Nuts are a universal fastener used in many woodworking, manufacturing, and DIY applications where a strong threaded fixing is needed in timber.
