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Exposed bolt ends on furniture, lamps, or brackets look unfinished and can snag fabric or scratch skin. These solid brass cap nuts are the clean fix that DIYers, furniture restorers, and hardware enthusiasts reach for when the details matter.
Made from H59-3 solid brass, each cap nut features a hexagonal base for wrench grip and a smooth domed top that fully covers the bolt end. Available in M3 through M20 (approximately 0.12 in to 0.79 in), with standard metric coarse thread pitch throughout.
Use them on decorative furniture hardware, electrical terminal studs, DIY lamp assemblies, motorcycle brackets, and pipe fittings — anywhere a raw nut looks out of place and a finished cap nut belongs.
Cover exposed bolt ends on chairs, tables, and shelving units for a clean, professional finish that complements wood and metal furniture alike.
Cap the threaded rod ends on pendant lamps, floor lamps, and custom lighting fixtures with a decorative brass dome that adds vintage character.
Use as terminal nuts on grounding studs and electrical lugs — brass is conductive and safe for low-voltage terminal applications.
Finish bracket bolts and frame hardware with a polished brass cap nut for a custom, detail-oriented look on bikes and custom builds.
| Material | H59-3 Solid Brass |
|---|---|
| Product Type | Hexagonal Domed Cap Nut (Acorn Nut / Cover Nut) |
| Surface Finish | Untreated natural brass (may develop patina; can be polished) |
| Available Sizes | M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20 |
| Thread Standard | Metric coarse thread (standard pitch per size) |
| Drive Type | Hexagonal base (wrench or pliers) |
| Head Style | Domed round cap with hex lower section |
| Key Properties | Corrosion resistance, high strength, anti-galling, non-toxic |
| Typical Applications | Furniture hardware, electrical terminals, decorative automotive/motorcycle bolts, lamp assemblies, pipe fittings, bearing retainers |
| Pack Options | See variant options |
These use standard metric coarse thread pitch for each size — for example, M6 is typically 1.0 mm pitch, M8 is 1.25 mm, and M10 is 1.5 mm. They fit standard metric bolts and machine screws. Fine-pitch threads (e.g., M8×1.0) are not compatible.
Untreated brass naturally oxidizes and develops a darker antique patina over time. To maintain the golden shine, apply a clear lacquer or polish occasionally with a brass cleaner. Since there is no coating, the brass behaves as natural brass should — the choice of finish is yours.
Both. The interior threads are fully functional — you can thread them directly onto a bolt to act as a standard nut while the domed top covers the bolt end. For soft materials, use a flat washer underneath. They are suitable for light to medium duty applications such as furniture assembly and electrical panels.
Yes — brass is electrically conductive and suitable for use as terminal nuts on grounding studs or electrical lugs. The domed shape provides some protection against accidental contact, though these are not insulated. For high-voltage applications, add a rubber boot over the cap for additional safety.
Each size is sold separately so you can order exactly what your project requires. If you need a variety assortment, please contact our customer service team — custom packs may be available with a minimum quantity.
The interior depth is generally approximately equal to the thread diameter — for example, an M6 cap nut typically has around 6 mm of internal depth. Measure your bolt's protrusion before ordering and shorten the bolt if needed to ensure the bolt end does not bottom out inside the dome.
These terms are used interchangeably and refer to the same type of fastener: a nut with a closed domed top that covers the bolt end. "Cap nut" and "cover nut" emphasize the protective function, while "acorn nut" and "dome nut" describe the shape. All refer to this product.
Brass has good corrosion resistance and performs well in light outdoor environments. However, prolonged exposure to moisture, salt air, or harsh chemicals will accelerate patina development. For outdoor use, applying a clear lacquer or sealant is generally recommended to slow oxidation.
