{"product_id":"304-stainless-steel-cap-nuts-m3-m12-acorn-dome-nuts","title":"304 Stainless Steel Cap Nuts M3–M12 – Acorn Dome Nuts, Rust-Resistant","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n  \u003ch2\u003e304 Stainless Steel Cap Nuts — Clean Finish, Lasting Thread Protection\u003c\/h2\u003e\n  \u003cp\u003eExposed 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.\u003c\/p\u003e\n  \u003cp\u003eEach 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.\u003c\/p\u003e\n  \u003cp\u003eIdeal 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.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n  \u003cspan class=\"hdiy-compat-icon\"\u003e✅\u003c\/span\u003e\n  Compatible with standard metric coarse-thread bolts and threaded rod: M3, M4, M5, M6, M8, M10, M12\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n  \u003ch2\u003e✅ Key Features of These 304 Stainless Steel Cap Nuts\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003e304 Stainless Steel Construction:\u003c\/strong\u003e Naturally rust-resistant and corrosion-proof — no plating to chip or peel. Holds its bright finish indoors, outdoors, and in humid environments.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003ePrecision-Machined Threads:\u003c\/strong\u003e Deep, uniform metric threads engage cleanly without cross-threading. Smooth hex base provides a solid wrench grip without marring the finish.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eClosed Dome Top:\u003c\/strong\u003e Fully covers the bolt tip — no sharp thread exposure, no snagged fabric, no scratched surfaces. Child-safe and aesthetically clean.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003e7 Metric Sizes (M3–M12):\u003c\/strong\u003e From compact M3 for electronics and small fixtures to heavy-duty M12 for structural and industrial applications — one product line covers your full project range.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eStandard Hex Drive:\u003c\/strong\u003e Fits standard metric wrenches and sockets. Typical sizes: M3 → 5.5 mm, M4 → 7 mm, M5 → 8 mm, M6 → 10 mm, M8 → 13 mm, M10 → 16 mm, M12 → 18 mm.\u003c\/span\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n      \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n      \u003cspan\u003e\u003cstrong\u003eMulti-Industry Versatility:\u003c\/strong\u003e Suitable for furniture, automotive trim, marine hardware, food-processing machinery, medical devices, and general industrial assembly.\u003c\/span\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-usecases\"\u003e\n  \u003ch2\u003e🎯 Who Is This For?\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-usecase-item\"\u003e\n    \u003cspan\u003e🪑\u003c\/span\u003e\n    \u003cstrong\u003eFurniture Makers \u0026amp; DIYers\u003c\/strong\u003e\n    \u003cp\u003eCap exposed bolt ends on custom shelving, bed frames, and workbenches for a clean, snag-free finish that looks intentional.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"hdiy-usecase-item\"\u003e\n    \u003cspan\u003e🏍️\u003c\/span\u003e\n    \u003cstrong\u003eAutomotive \u0026amp; Motorcycle Builders\u003c\/strong\u003e\n    \u003cp\u003eUse acorn nuts on fairings, fender bolts, and frame hardware for a polished show-quality appearance that also resists road grime and moisture.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"hdiy-usecase-item\"\u003e\n    \u003cspan\u003e⚓\u003c\/span\u003e\n    \u003cstrong\u003eMarine \u0026amp; Outdoor Equipment\u003c\/strong\u003e\n    \u003cp\u003e304 stainless holds up to salt spray and UV exposure on boat hardware, outdoor furniture, and garden structures.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"hdiy-usecase-item\"\u003e\n    \u003cspan\u003e🏭\u003c\/span\u003e\n    \u003cstrong\u003eIndustrial \u0026amp; Food-Grade Applications\u003c\/strong\u003e\n    \u003cp\u003eSmooth, burr-free surface and 304 stainless composition make these suitable for food-processing equipment and medical device assembly where hygiene matters.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n  \u003ch2\u003e📏 Technical Specifications\u003c\/h2\u003e\n  \u003ctable\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eCap Nut \/ Acorn Nut \/ Dome Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eMetric coarse thread (standard M thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eAvailable Thread Sizes\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eHex (standard metric wrench)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural bright stainless — no plating\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003ePacking Quantities\u003c\/th\u003e\n\u003ctd\u003e1, 5, 10, 20, 25, 30, 50, 100 Pcs (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eApplications\u003c\/th\u003e\n\u003ctd\u003eFurniture, automotive, marine, food processing, medical, industrial\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre these compatible with standard metric bolts?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 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.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill 304 stainless steel rust over time?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e304 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.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the difference between a cap nut and a regular hex nut?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA 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.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use these in food processing equipment?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 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.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need a washer under the cap nut?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNot 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.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat wrench size do I need for each thread size?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eTypical 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.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I choose the right quantity for my project?\u003c\/summary\u003e\n    \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect 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.\u003c\/p\u003e\u003c\/div\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Inside Diameter and Packing Quantity above, then add to cart.\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 5 Pcs","offer_id":52253537665298,"sku":"GLFBBYWHK-KCSJ0008x5","price":6.5,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10 Pcs","offer_id":52253537698066,"sku":"GLFBBYWHK-KCSJ0008x10","price":7.44,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 20 Pcs","offer_id":52253537730834,"sku":"GLFBBYWHK-KCSJ0008x20","price":9.29,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 25 Pcs","offer_id":52253537763602,"sku":"GLFBBYWHK-KCSJ0008x25","price":10.21,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 30 Pcs","offer_id":52253537796370,"sku":"GLFBBYWHK-KCSJ0008x30","price":11.14,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 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