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Structure, Manufacturing Process & Furniture Assembly Application
Release time：2026.08.10
Source：Dexin Metal
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Professional Guide to Invisible Wood Furniture Connection Fasteners
1. What Is Dowel Ass? Structural Features & Working Principle
Dowel Ass is a combined fastener system exclusive for wood furniture connection, composed of a cross-thread cylindrical dowel nut and a matching self-tapping screw. The dowel nut is embedded horizontally into the pre-drilled transverse hole of the wood board, while the screw is vertically locked from the furniture surface. The cross internal thread structure perfectly combines positioning and locking functions, solving the common problems of loose assembly, exposed fasteners and easy board cracking in traditional furniture connection.
The biggest feature of Dowel Ass is hidden installation. After assembly, no hardware accessories are exposed on the furniture surface, completely retaining the integrity and texture of solid wood and panel furniture. Meanwhile, the cylindrical outer wall increases the contact area with the wood hole, effectively dispersing local pressure, preventing wood cracking, and improving the overall torsion resistance and tensile stability of the furniture connection.
2. Common Types & Material Selection
According to usage scenarios and load standards, Dowel Ass is divided into conventional furniture grade and reinforced heavy-duty grade. Conventional specifications such as M6 and M8 are widely used in daily civilian furniture including sofa legs, dining tables and cabinets. Reinforced thickened models are suitable for large solid wood furniture and load-bearing structural splicing.
In terms of materials, high-quality carbon steel is the mainstream raw material, with electro-galvanized blue-white zinc or yellow zinc surface treatment. The smooth plating layer effectively prevents rust and oxidation during long-term indoor use. For humid environments such as bathrooms and outdoor garden furniture, customized stainless steel Dowel Ass can avoid corrosion and ensure long-term assembly stability.
3. Standard Manufacturing Process of High-Quality Dowel Ass
As a precision matching fastener, the production precision of Dowel Ass directly determines the assembly accuracy and firmness of furniture. Formal manufacturers adopt standardized cold forming and finishing processes to ensure product consistency.
- Raw Material Inspection High-quality steel strips and wire rods are selected with strict hardness and toughness testing. Qualified raw materials ensure that the dowel nut is not easy to deform during extrusion and tapping, avoiding thread slipping.
- Cold Forging Forming Integral cold forging is adopted to form the cylindrical outer circle in one piece. The metal structure is dense and uniform, with high roundness, ensuring close fit with wood holes and no shaking after installation.
- Precision Cross Thread Tapping Professional internal thread tapping equipment processes cross vertical threads. The thread tooth shape is full and smooth, with high matching accuracy with supporting screws, ensuring smooth locking and no jamming.
- Surface Galvanizing Treatment Electro-galvanizing anti-rust treatment is carried out to form a protective layer on the surface, improving oxidation resistance and meeting long-term indoor furniture use standards.
- Full Inspection & Sorting Full inspection of outer diameter tolerance, thread precision and surface flatness is conducted to eliminate defective products such as deformed parts, burrs and abnormal threads, ensuring 100% qualified rate of delivered finished sets.
4. Core Advantages of Dowel Ass for Furniture Assembly
- Invisible & Beautiful All fasteners are hidden inside the wood board with no exposed holes or screws, perfectly improving the grade and appearance integrity of finished furniture.
- Anti-Cracking & Stable Connection The cylindrical stress dispersion structure avoids concentrated extrusion of traditional screws on wood fibers, effectively preventing board cracking and improving overall structural stability.
- High Assembly Efficiency Suitable for standardized batch assembly of furniture factories. The pre-embedded dowel nut realizes quick positioning and locking, greatly improving production efficiency.
- Easy Disassembly & Transportation Supports repeated disassembly and assembly, convenient for furniture packaging, container transportation and after-sales maintenance, reducing logistics damage rate.
5. Main Application Scenarios
Dowel Ass is widely applicable to all kinds of disassembled wooden furniture. The most typical usage is the installation of sofa legs, table legs, chair legs and cabinet support feet. It is also commonly used for frame splicing of wooden cabinets, bed frame assembly and solid wood board docking. It is the most practical standard hidden fastener for modern flat-pack furniture export and customized furniture production.
6. Professional Customization & Production Strength
Dexin Metal specializes in mass production and customized processing of standard and non-standard Dowel Ass fasteners. With mature cold forging, precision tapping and surface treatment technology, we strictly control product tolerance and matching accuracy. We support custom specifications, special plating and size optimization according to furniture factory drawings, providing stable, cost-effective hidden connection solutions for global furniture manufacturers.
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