M4 M5 M6 M8 304 Stainless Steel Furniture Connecting Bolts with Barrel Nuts

Measure the combined thickness of the panels being joined, then add approximately 5–10mm to allow for the barrel nut recess. For example, two 18mm panels joined together typically require a bolt in the 35–45mm range. Our range covers 8mm (5/16") through 150mm (≈5.9") across M4, M5, M6, and M8 diameters. When replacing an existing bolt, measure the original or check your furniture's assembly manual for the specified size.

304 stainless steel provides superior corrosion resistance compared to galvanised zinc-coated fasteners, making it a better choice for damp environments, outdoor furniture, bathrooms, or anywhere long-term rust resistance is a priority. Galvanised bolts are generally suitable for dry indoor use, while 304 stainless steel performs well in both indoor and moderately outdoor conditions without the risk of the zinc coating wearing away over time.

304 stainless steel generally offers good tensile and shear strength suitable for standard furniture assembly loads such as cot beds, wardrobes, shelving units, and cabinet frames. For structural or load-bearing applications beyond typical furniture use, we recommend contacting us to confirm suitability for your specific application.

Yes — 304 stainless steel has significantly better corrosion resistance than galvanised fasteners, making it suitable for damp indoor environments, covered outdoor furniture, bathrooms, and garden structures. For prolonged direct saltwater or coastal exposure, 316 marine-grade stainless steel is typically recommended for maximum long-term performance.

These bolts use the ISO metric coarse thread standard — M4, M5, M6, and M8 — which is the most widely used thread type in European and US flat-pack furniture and cot beds. They are compatible with standard metric barrel nuts of the same diameter (included in each set). Most major flat-pack furniture brands use this thread standard, but always verify the diameter and length required by your specific piece before ordering.

Each set is a matched pair — one connecting bolt and one barrel nut. Sets are available in packs of 1, 2, or 5 depending on the size selected. The packing quantity is clearly shown in the variant selector so you can order exactly what your project requires without over-buying.

These furniture connecting bolts are typically tightened using a hex key (Allen key) or a flat-head screwdriver, depending on the head recess style. The barrel nut is inserted into a pre-drilled cross-hole in the panel and tightened by rotating the bolt — no specialist tools are required beyond a standard screwdriver or hex key set.