Acorn Nuts
Manufacturer
India · Mumbai
“Acorn nut” and “hex cap nut” name the identical part. Acorn nut is simply the common decorative-hardware and furniture-trade name for the same DIN 1587 blind-bore dome nut we manufacture under its technical name on our Hex Cap Nuts page, which covers the full engineering detail — dome anatomy, the bolt-length installation trap, and one-piece vs two-piece construction. This page focuses specifically on finish selection and decorative/furniture-grade specification, since that’s how acorn nuts are most often searched for and bought.
Anatomy of an Acorn Nut — Rounded Dome, Finished Surface
An acorn nut gets its name from its resemblance to an acorn’s rounded cap — a smoothly domed, closed top sitting above a standard hex body, with the threaded bore closed off entirely rather than running through the full height the way a standard nut does. The bolt’s cut, exposed thread end sits fully enclosed inside that dome, never visible and never in contact with anything outside the nut.
Because the dome is the visible, touchable surface of the finished assembly — unlike the flat top of a standard hex nut, which is rarely the focal point of an installation — acorn nuts are manufactured with particular attention to the dome’s surface finish: smoothly polished, evenly plated, and free of the tooling marks or surface irregularities that would matter less on a functional nut hidden from view. This is the core reason acorn nuts, more than almost any other nut in our range, are specified by finish first and thread size second — the buyer is choosing an appearance for a visible part of the finished product, not just a fastening function.
For the complete engineering detail on the dome’s internal construction, the bolt-length clearance requirement, and one-piece versus two-piece manufacturing — all of which apply identically to acorn nuts and hex cap nuts, since they are the same part — see our Hex Cap Nuts page.
Why Acorn Nuts — Appearance Is the Point, Not an Afterthought
A Genuinely Finished, Deliberate Appearance
A rounded, polished dome reads as an intentional design choice wherever the fastener is visible in the finished product — furniture, fixtures, trim, and architectural hardware routinely specify acorn nuts specifically for this reason, not for any additional mechanical performance over a plain hex nut.
No Sharp Exposed Thread to Snag or Cut
The dome fully encloses the bolt’s cut thread end, removing the minor snagging and cut hazard a bare protruding thread presents — a real, practical benefit on furniture, railings, and any hardware within reach of bare skin or clothing, alongside the decorative benefit.
Matched Finish Across an Entire Product Line
Because acorn nuts are available in the same chrome, brass, and stainless finishes used across handles, hinges, and other visible hardware, an entire furniture or fixture range can present a consistent, coordinated finish across every visible fastening point.
Same Wrenching as Any Standard Hex Nut
Despite the decorative dome, the hex body beneath it accepts the same standard wrench and socket sizes as an equivalent hex nut — the finished appearance costs nothing in tooling compatibility during installation.
Acorn Nut Finish Options — Chrome, Brass, Stainless
Finish selection for acorn nuts follows the surrounding hardware’s finish first, and environment second.
Chrome-Plated Acorn Nut
Bright, mirror-polish chrome plating over carbon steel — the standard finish for automotive and motorcycle trim, and any hardware matching existing bright chrome fixtures.
Brass Acorn Nut
Solid brass, available natural or clear-lacquered to slow tarnishing — the traditional choice for furniture hardware, cabinetry, and heritage or period-style fixtures.
Stainless Steel Acorn Nut
SS 316L in natural or mechanically polished finish — corrosion resistance suited to outdoor, marine, or wash-down environments where chrome plating or brass would eventually degrade.
Acorn Nut Configurations
Standard and low-crown dome profiles across all three decorative finishes. M4–M24.
Standard Acorn Nut
Standard dome height, the default configuration for general furniture, trim, and architectural hardware applications across all three finishes.
Low-Crown Acorn Nut
Reduced dome height for a subtler, flatter decorative profile — for applications where a lower-profile finished appearance is preferred.
Matching Finish Washers
Chrome, brass, or stainless flat washers finish-matched to acorn nut selection, for a fully coordinated visible fastening point.
Custom Acorn Nuts
Custom plating, brushed or satin finishes, and drawing-specific configurations. Contact sales@akbarfasteners.in with thread size, finish, and quantity.
Acorn Nut Size Chart — M4 to M24
Across-flats dimension and typical internal bore depth — always confirm bolt exposed length against bore depth before ordering; see our Hex Cap Nuts page for the full bolt-length installation guidance.
| Thread Size | Across Flats (mm) | Dome Height (mm) | Available Finishes |
|---|---|---|---|
| M4 | 7.0 | 8.5 | Chrome / Brass / SS |
| M5 | 8.0 | 9.5 | Chrome / Brass / SS |
| M6 | 10.0 | 11.0 | Chrome / Brass / SS |
| M8 | 13.0 | 14.0 | Chrome / Brass / SS |
| M10 | 17.0 | 16.5 | Chrome / Brass / SS |
| M12 | 19.0 | 19.0 | Chrome / Brass / SS |
| M16 | 24.0 | 23.5 | Brass / SS |
| M20 | 30.0 | 28.0 | SS Only |
Larger sizes are typically stainless steel only, reflecting demand — chrome and brass acorn nuts are predominantly specified at smaller decorative hardware sizes.
Acorn Nut Application Areas
Anywhere the fastener is visible in the finished product and appearance is part of the specification.
Furniture & Cabinetry
decorative trim points
Railings & Balustrades
staircase & balcony fastening
Automotive & Motorcycle Trim
visible hardware fastening
Marine Deck Hardware
deck fitting fastening
Signage & Display Fixtures
retail & exhibition displays
Bathroom & Kitchen Fixtures
visible fixture hardware
Appliance Panels
consumer product finish points
Heritage & Restoration
historic fixture matching
Acorn Nut Standards Coverage
Same ISO 9001:2015 quality system as our complete fastener range. Dimensional standards are shared with our Hex Cap Nut range, since these are the identical part.
Complete Documentation Package
Material Stated
Thickness (On Request)
Dome Height · Across Flats
Conformance
On Request
Related Nut Types & Materials
Acorn nuts for decorative, finish-first specification. Hex cap nuts for the full technical and industrial detail on the identical part. Brass and stainless for the complete decorative material range.
Hex Cap Nuts
The identical part under its technical name — full engineering detail on the dome anatomy, the bolt-length installation trap, and one-piece vs two-piece construction.
View Hex Cap Nuts →Brass Fasteners
The complete brass fastener range beyond acorn nuts — for furniture, cabinetry, and decorative hardware requiring a matched brass finish throughout.
View Brass Range →SS 316L Fasteners
For acorn nut applications in marine, outdoor, or wash-down environments where chrome plating or brass would eventually degrade.
View SS 316L →Full Nut Range
Complete nut manufacturing capability at Akbar Fasteners — hex, heavy hex, square, K-Lock, acorn/cap, and all specialty forms across carbon steel through exotic alloy.
View Nut Range →Need Acorn
Nuts?
Thread size · finish (chrome/brass/stainless) · quantity. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Export: +91 8696 32 4646 · Support: +91 800 9315 333 · export@akbarfasteners.in