304 Stainless Steel Acorn Cap Nuts M3–M12 | Furniture & Auto

304 Stainless Steel Acorn (Domed Cap) Nuts — M3, M4, M5, M6, M8, M10, M12

Upgrade your fastening game with these precision-crafted 304 stainless steel acorn nuts. The smooth, domed cap design conceals exposed bolt threads for a clean, professional finish — perfect for furniture assembly, automotive projects, woodworking, and decorative applications. Available in a wide range of metric sizes (M3 through M12) to suit virtually any project.

Why Choose These Acorn Cap Nuts?

• Grade 304 Stainless Steel — Highly resistant to rust, corrosion, and everyday wear, making them suitable for both indoor and outdoor use.
• Domed Cap Design — Neatly covers raw bolt ends for a polished, finished appearance in visible applications.
• Wide Size Range — Available in M3, M4, M5, M6, M8, M10, and M12 to fit a broad variety of bolts and threaded rods.
• Versatile Applications — Ideal for furniture, cabinetry, automotive bodywork, motorcycles, railings, machinery guards, and decorative metalwork.
• No High-Concern Chemicals — Manufactured without harmful substances for safe handling and use.

Specifications

• Material: 304 Stainless Steel
• Type: Acorn / Domed Cap Nut
• Thread Sizes Available: M3, M4, M5, M6, M8, M10, M12
• Standard: DIN 1587
• Finish: Natural stainless steel
• Country of Origin: Made in China

Common Applications

• Furniture assembly & cabinetry
• Automotive & motorcycle bodywork
• Woodworking projects
• Decorative metalwork & railings
• Machinery & equipment guards
• Marine & outdoor structures

For more information on fastener standards and safe hardware use, visit the U.S. Consumer Product Safety Commission (CPSC) for hardware safety guidelines, or reference NIST Standards Information for fastener technical standards.

Frequently Asked Questions

Q: What is a 304 stainless steel acorn nut and what makes it different from a regular hex nut?

A: A 304 stainless steel acorn nut (also called a domed cap nut) features a rounded, dome-shaped top that covers the exposed end of a bolt or threaded rod. Unlike a standard hex nut, the acorn nut provides a finished, decorative appearance while also protecting threads from dirt, damage, and corrosion. The 304 grade stainless steel ensures excellent rust resistance for long-lasting performance.

Q: Which metric thread sizes do these acorn cap nuts come in?

A: These acorn nuts are available in M3, M4, M5, M6, M8, M10, and M12 metric thread sizes, covering the most common bolt diameters used in furniture, automotive, woodworking, and general hardware applications.

Q: Are these stainless steel cap nuts suitable for outdoor or marine use?

A: Yes! Grade 304 stainless steel offers strong resistance to corrosion and rust, making these domed cap nuts a great choice for outdoor furniture, railings, garden structures, and light marine applications where exposure to moisture is a concern.

Q: How do I choose the correct acorn nut size for my project?

A: Match the acorn nut's thread designation (M3, M4, M5, M6, M8, M10, or M12) to the diameter of the bolt or threaded rod you are using. For example, an M6 bolt requires an M6 acorn nut. If you are unsure, measure the outer diameter of your bolt thread in millimeters — the number in millimeters corresponds directly to the metric size designation.