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Exposed bolt ends are a hazard — they snag clothing, scratch surfaces, and corrode over time. These 304 stainless steel acorn cap nuts solve all three problems at once, giving your fastened joints a polished, professional look while shielding threads from damage and rust.
Each cap nut features a closed domed top and a standard hex base, machined from solid 304 stainless steel. Available in seven metric sizes — M3, M4, M5, M6, M8, M10, and M12 — with packing quantities from 1 to 100 pieces to match your project scale.
Ideal for custom furniture assembly, motorcycle and automotive trim, marine deck hardware, food-processing equipment, and medical device fabrication — anywhere a clean, corrosion-resistant thread termination is required.
Cap exposed bolt ends on custom shelving, bed frames, and workbenches for a clean, snag-free finish that looks intentional.
Use acorn nuts on fairings, fender bolts, and frame hardware for a polished show-quality appearance that also resists road grime and moisture.
304 stainless holds up to salt spray and UV exposure on boat hardware, outdoor furniture, and garden structures.
Smooth, burr-free surface and 304 stainless composition make these suitable for food-processing equipment and medical device assembly where hygiene matters.
| Material | 304 Stainless Steel |
|---|---|
| Type | Cap Nut / Acorn Nut / Dome Nut |
| Thread Standard | Metric coarse thread (standard M thread) |
| Available Thread Sizes | M3, M4, M5, M6, M8, M10, M12 |
| Drive Type | Hex (standard metric wrench) |
| Surface Finish | Natural bright stainless — no plating |
| Packing Quantities | 1, 5, 10, 20, 25, 30, 50, 100 Pcs (select variant) |
| Applications | Furniture, automotive, marine, food processing, medical, industrial |
Yes. M3–M12 sizes match standard metric coarse-thread bolts and threaded rod. For example, an M6 cap nut fits any standard M6 bolt. If your application uses fine-pitch threads, verify the thread pitch before ordering.
304 stainless is highly corrosion-resistant for most indoor and outdoor environments. In extreme saltwater or chloride-heavy conditions (e.g., coastal marine), minor surface discoloration is possible. For heavy marine use, 316 stainless is recommended. For furniture, automotive, and general workshop applications, 304 is more than sufficient.
A cap nut has a closed domed end that covers the bolt tip completely. A standard hex nut is open on both sides. The dome protects exposed threads from damage, prevents snagging, and provides a finished decorative appearance — which is why cap nuts are also called acorn nuts or dome nuts.
Yes. 304 stainless steel is widely used in food-industry applications due to its corrosion resistance and ease of cleaning. The smooth, burr-free surface minimizes bacteria traps. Always verify that all assembly components and lubricants comply with your local food-safety regulations.
Not required, but recommended for vibration-prone applications. A flat washer distributes clamping force and protects the surface beneath. A lock washer between the cap nut and the work surface adds extra resistance to loosening under vibration.
Typical hex wrench sizes: M3 → 5.5 mm, M4 → 7 mm, M5 → 8 mm, M6 → 10 mm, M8 → 13 mm, M10 → 16 mm, M12 → 18 mm. These are standard metric sizes — always verify against the actual nut flats if you have a non-standard variant.
Select the packing quantity that matches your project needs. Small repairs or samples: 1–5 Pcs. Medium projects (furniture, bike builds): 10–25 Pcs. Bulk workshop stock or production runs: 50–100 Pcs. Buying in larger quantities generally reduces the per-piece cost.
