Barrel nuts (also commonly known as cross dowels or dowel nuts) are cylindrical fasteners with an internal thread that runs perpendicular to the length of the barrel.
They are primarily used to create strong, right-angle joints in furniture and aerospace structures where a standard nut and bolt would be too bulky or heavy.
Common Types of Barrel Nuts
Cross Dowel Barrel Nuts: The most common type for furniture. These are simple cylindrical "slugs" with a threaded hole in the centre. One end typically has a slotted drive so you can use a screwdriver to align the internal threads with the incoming bolt.
Typical Materials & Sizes
Materials:
Zinc-Plated Steel: Common and cost-effective for indoor furniture.
Stainless Steel (A2 or A4): Used for outdoor or marine environments to prevent rust.
Standard Sizes: Most DIY furniture uses M6 or M8 threads.
M6 x 14mm: Standard for cots, chairs, and cabinets.
M8 x 20mm: Used for heavier joints like bed frames or large timber structures.
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