Acorn Nut
Our acorn nut collection gives every assembly a clean, finished look while protecting exposed threads from bumps, snags, and corrosion. Built for reliability and appearance, our acorn nuts cap your bolts with a smooth dome that’s as tough as it is tidy. Choose them when you want professional-grade performance that also looks the part.
About Our Acorn Nuts
An acorn nut, often called a cap nut, features a closed, domed top that covers the end of a bolt or screw. That simple shape does a lot: it shields threads from damage, prevents sharp edges from catching skin or fabric, and seals out dirt for longer service life. If you’re building furniture, outfitting machinery, or finishing architectural metalwork, our acorn nuts add durability and a refined, safety-first finish.
We stock acorn nuts in workhorse materials to match your environment and aesthetic. Stainless steel delivers excellent corrosion resistance for outdoor, marine, and food-processing applications while maintaining a sleek, modern look. Zinc-plated or hot-dip galvanized carbon steel provides rugged strength with added protection against the elements, and brass offers a warm tone and natural corrosion resistance for decorative or electrical uses where conductivity matters.
If your project needs complementary hardware, you’ll also find our Square Nut for classic load-bearing joins, our Keps Nut for time-saving assembly with its captive washer, and our Tee Nut for strong, flush-mounted wood connections.
DIN 1587 Acorn Nuts
Our DIN 1587 acorn nuts follow the trusted European standard for consistent dome height, thread fit, and wrenching geometry. The domed profile fully covers the bolt tip to reduce injury risk and protect nearby surfaces, making them a smart choice anywhere hands, clothing, or cables pass by fasteners. Because the cap closes the thread end, these nuts also help keep contaminants out, supporting smoother maintenance and easier disassembly down the line.
Fit, Threads, and Sizes
Get the fit right and the job goes smoothly. Our acorn nuts are available in both metric and inch series with standard coarse and fine thread pitches to match your bolts precisely. Select a dome height that clears the cut end of your fastener, and pair the nut with the correct wrench size for clean, confident tightening.
Applications That Benefit
Any installation where exposed threads could scratch, snag, or corrode is a candidate for an acorn nut. Use them on guard rails, fixtures, equipment panels, bicycle racks, playground elements, automotive trim, and furniture for a safer, more polished finish. The result is a fastener that pulls double duty, mechanical security with a design-grade appearance.
Installation Notes
Start the nut by hand to ensure proper thread engagement, then tighten with a wrench or socket until snug and secure. Because the cap stops at the dome, avoid overtightening against the bolt tip, select a bolt length that allows clamping without bottoming out. For high-vibration setups, pair with a threadlocker, a spring washer, or use a corresponding lock solution to maintain preload over time.
Why Our Acorn Nuts Stand Out
We focus on the details that matter on the bench and in the field, clean threads, consistent plating, accurate dome geometry, and dependable stock breadth. That means faster assembly, fewer reworks, and a finish that makes your build look as good as it performs. When your project calls for tidy, safe, and long-lasting fastenings, our acorn nuts deliver.
FAQs
What is an acorn nut used for?
An acorn nut caps the end of a bolt to protect threads, prevent snags, and create a clean, finished look. It’s commonly used where people contact the hardware or where appearance matters. By enclosing the bolt tip, it also helps limit contamination and corrosion at the thread end.
What is the difference between a cap nut and an acorn nut?
In everyday use, “cap nut” and “acorn nut” refer to the same component: a nut with a closed, domed end. “Acorn” describes the shape, while “cap” describes the function of covering the bolt. Standards like DIN 1587 define the dimensions and tolerances for this style.
What is an acorn nut called?
It’s also known as a cap nut, domed nut, or crown nut in different catalogs and regions. The DIN 1587 designation identifies the standardized metric version. No matter the name, the key feature is the protective dome that covers the exposed bolt end.