Screw-in sleeve - A stable solution for connections in furniture construction
Screw-in sockets are indispensable connecting elements in furniture construction, interior design and many other craft applications. They enable the production of durable, resilient and reusable screw connections in wood. Thanks to their metric internal thread and a special external thread for wood, they ensure a secure hold and prevent the screw connection from tearing out.
Whether for furniture assembly, professional timber construction or DIY - a high-quality screw-in sleeve offers decisive advantages. The robust models from Scheulenburg are particularly impressive thanks to their precise manufacturing, corrosion protection and simple processing. But what is important when selecting and installing them? And what are the differences between the various versions?
Threaded socket for wood - technology and application in detail
A threaded socket is screwed into a pre-drilled hole in the wood and provides a permanently stable mount for metric screws. These sockets are particularly popular in furniture construction, as they allow repeated assembly and disassembly without the screws in the wood wearing out or tearing.
Important properties and advantages:
- Internal thread: Metric standard sizes such as M4, M6, M8 up to M12 for high loads. External thread: Coarse wood thread or special grooves for optimum hold in soft and hard woods.
- Material: Galvanised steel or brass for high load capacity and corrosion protection.
- Mounting options: Slotted or hexagon socket drive for easy screwing in.
- Load-bearing capacity: Prevents wood screws from "noodling out", enables durable and resilient connections.
Areas of application for screw-in sockets:
- Furniture construction: Ideal for the repeated assembly of table legs, shelves or bed frames.
- Staircase construction: Secure connection of banisters and handrails.
- Kitchen and interior design: Stable fastening solutions for cabinets, panelling and panels.
- Trade fair and shop construction: Reusable, resilient connections for quick assembly and dismantling.
Screw-in nut - Correct installation for maximum hold
The correct installation of a screw-in nut is crucial for a permanently resilient connection. Unlike wood screws, a screw-in nut does not bite into the material on its own, but requires a pre-drilled hole.
Step-by-step instructions for installation:
- Select the appropriate drill diameter: The drill diameter should correspond to the core diameter of the sleeve. In hardwood, the drill hole can be slightly larger to reduce stresses.
- Drill a hole: The hole must be vertical and deep enough so that the sleeve is flush with the surface. A slightly countersunk drill hole makes it easier to screw in.
- Screwing in thesleeve: Depending on the variant, the sleeve is screwed in using a screwdriver (slotted sleeves) or an Allen key (hexagon socket sleeves). An auxiliary screw with lock nut can be used for absolutely straight installation.
- Check the fit: The sleeve should be flush with the wood surface and not turn.
- Insert the screw: The metric screw can now be screwed in. This connection can be loosened and retightened as often as required without damaging the material.
Screw-in sleeve Drilling table
| Variant | Metric dimensions | Diameter (mm) | Length (mm) | required bore | ISK hexagon |
|---|---|---|---|---|---|
| ISK | M4 | 8.0 | 10.0 | 6.5 | SW4 |
| ISK | M5 | 10.0 | 12.0 | 8.5 | SW5 |
| ISK | M6 | 12.0 | 12.0 | 10.0 | SW6 |
| ISK | M6 | 12.0 | 15.0 | 10.0 | SW6 |
| ISK | M6 | 12.0 | 18.0 | 10.0 | SW6 |
| ISK | M8 | 14.0 | 15.0 | 12.0 | SW8 |
| ISK | M8 | 14.0 | 18.0 | 12.0 | SW8 |
| ISK | M8 | 16.0 | 18.0 | 14.0 | SW8 |
| ISK | M8 | 12.0 | 18.0 | 10.0 | SW6 |
| ISK | M10 | 18.5 | 20.0 | 16.0 | SW10 |
| Slot | M4 | 6.5 | 8.0 | 5.0 | |
| Slot | M4 | 8.0 | 8.0 | 6.5 | |
| Slot | M6 | 12.0 | 10.0 | 10.0 | |
| Slot | M6 | 12.0 | 12.0 | 10.0 | |
| Slot | M6 | 12.0 | 15.0 | 10.0 | |
| Slot | M6 | 12.0 | 18.0 | 10.0 | |
| Slot | M6 | 12.0 | 20.0 | 10.0 | |
| Slot | M6 | 12.0 | 25.0 | 10.0 | |
| Slot | M8 | 14.0 | 15.0 | 12.0 | |
| Slot | M8 | 14.0 | 18.0 | 12.0 | |
| Slot | M10 | 16.0 | 18.0 | 14.0 |
Screw-in nut with hexagon socket drive
Provide optimum grip when screwing in and higher torque transmission. Ideal for hardwood or high loads. The ISK sockets are manufactured with a collar. This ensures a clean finish and prevents deep penetration into the wood.
Threaded sockets with slotted drive
Screw in with a screwdriver - simple installation, but more difficult to screw in with hard materials. Due to its design, a slotted drive cannot achieve the same force as a hexagon socket drive.
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Our slotted screw-in sockets
Wood screw-in nut - Special challenges in hardwood
Hardwoods such as oak, beech, walnut or hard wood-based materials pose special challenges for assembly. Due to the high material density, the resistance when screwing in is often very high.
Tips for secure installation in hardwood:
- Choose a slightly larger drill hole: In very dense wood, the drill diameter should be 0.2-0.4 mm larger than in softwood.
- Use sockets with a longer thread: A longer socket offers more contact surface and therefore better grip.
- Screw in slowly and with feeling: Excessive torque can damage the socket or the wood.
- Optional: Glue in the socket: For extremely high loads, a special thread adhesive can additionally secure the connection.
Screw-in sockets from Scheulenburg - Highest quality for secure timber joints
Screw-in sockets are an essential connecting element for stable, repeatable screw connections in wood. The high-quality threaded sockets from Scheulenburg stand for precise manufacturing, maximum load-bearing capacity and a long service life. Thanks to their metric internal thread and specially developed external thread, they offer a secure hold and prevent the screw connection from tearing out - ideal for furniture construction, interior fittings or other woodworking applications.
Our screw-in sockets are available in various designs and are a perfect match for the Scheulenburg connection systems, making them highly versatile. Thanks to carefully selected materials such as galvanised steel or brass, they are corrosion-resistant and optimised for long-term use. With Scheulenburg screw-in sockets, you can rely on a reliable, custom-fit solution for professional timber connections.
Added value of Scheulenburg threaded sockets
Why should you rely on Scheulenburg?
- Precise production: High dimensional accuracy for a perfect fit and secure hold .
- Corrosion protection: Galvanised sockets for long-term durability, even with changing humidity. Wide range of sizes: From M4 to M12, suitable for every requirement.
- Optimised thread form: Ensures a tight fit and minimises the risk of tearing.
- Versatile areas of application: Whether furniture construction, interior fittings or staircase construction - Scheulenburg threaded sockets offer a stable connection solution for a wide range of requirements.
In addition, our Scheulenburg threaded sockets are perfectly matched to our connection systems and can be optimally combined with our furniture connectors. Regardless of whether you are looking for a solution for classic furniture construction or special applications - our systems ensure precisely fitting, detachable connections:
Furniture connector search by system: Scheulenburg furniture connector systems
Furniture connector search by application: the right connections for your project
Thanks to their compatibility with our connection systems, our threaded sockets enable an efficient and secure design that meets the highest requirements in terms of stability and reusability.
Screw-in aid for threaded sockets - clean installation, precise hold
A suitable screw-in aid is a crucial tool for the secure and precisely aligned installation of threaded sockets. The screw-in aid from Scheulenburg has been specially developed for professional use in furniture and interior design. It ensures that sockets are always countersunk straight into the wood with a defined screw-in depth - regardless of the material or location.
The tool is equipped with a magnetic holder that holds the socket reliably. An adjustable depth limiter protects the workpiece from damage and ensures consistent results. Thanks to its ergonomic handle and compact design, the screw-in aid is suitable for stationary use in the workshop as well as for on-site installation at the customer's premises.
The screw-in aid is compatible with standard ISK drives (M6 and M8) and can be extended using plug-in attachments. This makes it an ideal match for the threaded sockets from the Scheulenburg range and supports fast, clean and gentle processing - without the need for crooked positioning or reworking.
Conclusion:
Whether in furniture making, staircase construction or wooden structures - a high-quality screw-in nut provides a durable and resilient connection. Scheulenburg threaded sockets impress with their quality, precision and ease of processing. With the right assembly and a suitable selection depending on the material and application, they are the perfect solution for durable, stable screw connections in wood.