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You’ve got a bolt sticking out of a furniture piece, a DIY lamp, or maybe a motorcycle bracket – and the raw nut just looks unfinished. These solid brass cap nuts screw right over standard metric nuts or bolt ends, hiding everything under a smooth, rounded dome. No more exposed threads snagging clothes or scratching skin. The brass gives a warm, classic look that ages beautifully, unlike cheap zinc or plastic caps. Perfect for furniture restoration, electrical enclosures, decorative hardware, or any project where you want a clean, professional finish. Available from tiny M3 up to M20.
Solid brass construction – H59-3 brass alloy offers excellent corrosion resistance, high strength, and natural anti‑galling properties. Won't rust like steel, won't crack like plastic.
Decorative domed cap design – The hexagonal base for wrench grip blends into a smooth round top. Hides the bolt end completely for a polished, furniture‑grade look.
Untreated natural finish – Raw brass develops a rich patina over time, or you can polish it to keep the golden shine. No coating to peel or flake.
Precision threaded interior – Clean, burr‑free threads ensure even force distribution and a tight, secure fit. Won't cross‑thread or loosen under vibration.
Wide metric range M3 to M20 – Use on small electronics hardware up to heavy furniture bolts. Standard metric pitch fits most machine screws and bolts.
Smooth domed exterior – No sharp edges means safer to touch, easier to clean, and won't snag fabric or skin.
| Brand | Goobetter |
|---|---|
| Product Name | Hexagonal Domed Cap Nut (Acorn Nut / Cover Nut) |
| Material | H59-3 Solid Brass |
| Surface Finish | Untreated (natural brass – may darken with age, can be polished) |
| Available Sizes (Metric Thread) | M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20 |
| System of Measurement | Metric |
| Drive Type | Hexagonal base (use wrench or pliers for installation) |
| Head Style | Domed round cap with hex lower section |
| Key Properties | Corrosion resistance, high strength & toughness, excellent cutting performance, non‑toxic |
| Typical Applications | Furniture hardware, electrical terminals, decorative automotive/motorcycle bolts, pin ends, pipe fittings, bearing retainers |
They use standard metric coarse thread pitch for each size. For example, M6 is 1.0mm pitch, M8 is 1.25mm, M10 is 1.5mm. They fit standard metric bolts and machine screws. If you have a fine pitch thread (like M8x1.0), these won't work – contact us for special orders.
Untreated brass naturally oxidizes and develops a darker, antique patina. Many people love that look for vintage furniture or industrial decor. If you want to keep it bright, apply a clear lacquer or polish occasionally with a brass cleaner. The choice is yours – it's not coated, so it behaves like real brass should.
Both. The interior threads are fully functional – you can screw them directly onto a bolt to act as a standard nut. The domed top just adds a finished look and covers the bolt end. For best results, use a flat washer underneath if the material is soft. They're strong enough for most light to medium duty applications like furniture assembly or electrical panels.
Yes – brass is conductive, so they can be used as terminal nuts on grounding studs or electrical lugs. The domed shape also provides some insulation protection against accidental contact (though they are not insulated like plastic caps). For high‑voltage applications, add a rubber boot over the cap for safety.
We sell each size separately so you can order exactly what your project needs. If you need a variety pack, please contact our customer service – we can create a custom assortment for you (minimum quantity may apply).
