Magnetic closure box: pull-force specifications, structures, and ordering guide

By Sonia Sun, Founder, Huamei 華美 — since 1992. Published 26 May 2026. Updated 26 May 2026.

Sonia Sun has specified magnetic closure systems for gift boxes across spirits, cosmetics, and premium consumer goods since founding Huamei in 1992 — including closures tested to the full 6–50 g pull-force range across four factories in Henan, Zhejiang, Sichuan, and Guizhou.

A magnetic closure box holds shut by the attraction between two embedded neodymium magnets — one in the lid, one in the base — rather than with a ribbon, tuck flap, or mechanical latch. The closure opens and closes cleanly, with an audible snap and a defined pull-force that ranges across box types and board weights. For gift packaging, spirits presentation cases, cosmetic sets, and premium retail unboxing, the magnetic closure has become a category standard for its combination of tactile authority and ease of repeated opening.

This guide covers how magnetic closures work, what determines pull-force, how to select the right closure geometry for a brief, and what to expect from a custom order.

What is a magnetic closure box?

A magnetic closure box is a rigid or paperboard gift box with neodymium magnets embedded in the lid and base that hold the closure shut without a latch or ribbon. Pull-force runs from 6 to 50 grams at 2,800 Gauss, varying with magnet grade, board weight, and closure geometry.

The mechanism: opposing-polarity magnets are set into the greyboard walls of the lid and base during assembly. The box opens with a smooth pull; the lid seats back with a snap. The wrap — paper, fabric, or laminate — covers the magnet inserts entirely, so the exterior surface is uninterrupted. Pull-force is a function of magnet grade (measured in Gauss), magnet size, and the gap between the two magnets when the box is closed, which is controlled by board weight and insert geometry.

Huamei's magnetic closure range runs from 6 g at the lightest closure — a cosmetics carton in thin greyboard — to 50 g at the heaviest — a spirits presentation case in 3.0 mm board. All pull-force measurements are taken at 2,800 Gauss magnet grade on finished, assembled boxes, not on the magnet in isolation. See /craft/magnetic for the full specification, and /craft/rigid for how board weight interacts with closure and wall integrity.

What pull-force should a magnetic closure box have?

Pull-force should match the intended use: light closures suit packaging opened frequently; heavy closures communicate permanence and authority on a presentation case opened rarely.

The practical guidance by use case:

• 6–15 g: Cosmetics and daily-use retail boxes. Suited to products opened and closed multiple times per day. The pull feels inviting rather than resistant.
• 16–35 g: Gift boxes for seasonal or occasional use. The standard range for skincare sets, fragrance boxes, and mid-weight spirits gifting.
• 36–50 g: Collector editions, spirits presentation cases, and gift packaging intended to communicate weight and permanence. The Wuliangye Premium Brew clamshell and Luoyang Dukang presentation cases run in this range.

The practical floor is 6 g. Below that, lid weight or ambient temperature variation may cause the box to self-open — a failure mode that is unacceptable in display or retail packaging. The ceiling for paper-wrapped greyboard is around 50 g; above that, repeated opening stresses the paper at the pull point and risks delamination over the product life.

Write the pull-force into the brief as a range — "20–30 g" rather than "25 g exactly" — because magnet-to-magnet geometry varies slightly across a production run.

What board weights work with magnetic closure boxes?

Board weight governs both structural performance and closure force. The standard range for magnetic closure rigid boxes is 1.5 mm to 3.0 mm greyboard, with magnet grade scaled to match.

• 1.5 mm greyboard: lightweight cosmetics and retail cartons. Pull-force 6–15 g. Suited to products opened once or twice before being stored.
• 2.0 mm greyboard: the cosmetics-industry standard board weight. Pull-force 15–30 g. Covers most seasonal gift sets, fragrance boxes, and skincare presentation cases.
• 2.5 mm greyboard: spirits single-bottle cases and mid-weight gift boxes. Pull-force 25–40 g.
• 3.0 mm greyboard: collector editions, spirits double-bottle clamshells, premium presentation cases. Pull-force 35–50 g.

Board weight also determines corner radius tolerance and stacking compression — both relevant if the box must pass transit-grade testing for export: high 50°C, low −30°C temperature extremes, and a 24-hour vibration simulation.

What surface finishes suit magnetic closure boxes?

Every decorative finish available on a flat rigid box applies to a magnetic closure box, because the magnet inserts are set into the core greyboard and do not affect the exterior face.

Common finishes on magnetic closure boxes:

• Hot-foil stamping: seventeen curated colours, in-house at Huamei. Applied at high registration on the lid face and spine. FSC-certified paper substrates are available for packaging programmes with sustainable-sourcing requirements.
• Emboss and deboss: three-dimensional relief on the lid face, typically registered to the foil edge at ±0.1 mm. Standard on spirits packaging and cosmetics where the brand mark carries tactile weight.
• Soft-touch lamination: matte, velvety surface with strong abrasion resistance. The most common finish on cosmetics gift sets and fragrance packaging.
• Spot UV: gloss accent on a matte-laminate substrate. Creates contrast between the brand logo and the box field without changing the overall surface colour.

BSCI social-audit documentation is on file for Huamei's factories, satisfying the supplier-compliance requirements of EU and US retail accounts that require factory audit records.

How do I order custom magnetic closure boxes?

Custom magnetic closure boxes from Huamei begin at 200+ pieces. The standard process:

1. Brief: dimensions (exterior L × W × H), target pull-force range, board weight, surface finish, and insert requirements.
2. Structural sample: 7–10 days from an approved brief to a production-representative sample. Magnets are installed and pull-force is confirmed at this stage.
3. Finish confirmation: hot-foil, emboss, and specialty lamination are confirmed on the structural sample or on a separate finish proof within the same window.
4. Production: 15–20 days from approved sample to sealed crate. Transit-grade master-carton packing is standard.

"Huamei holds magnetic-closure pull-force to 6–50 grams at 2,800 Gauss across closure types and board weights — the range covers cosmetics cartons at 6 grams through spirits presentation cases at 50 grams."

"At 2.0 mm greyboard — the cosmetics-industry standard — magnetic closure pull-force runs 15–30 grams, sufficient for repeated daily access without self-opening."

"Custom magnetic closure boxes from Huamei ship in 15–20 days from an approved sample at a 200+ piece MOQ floor, with structural sampling completed in 7–10 days."

"Huamei's factories run on more than 80% green energy, primarily solar, across all four manufacturing sites in Henan, Zhejiang, Sichuan, and Guizhou."

Begin a brief at /begin. For the full magnetic closure structure library, see /craft/magnetic. For spirits and gifting sector case studies, see /industry/spirits.