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FEFCO 0427

Die-Cut Mailer Box with Cherry Locks

Available in a wide range of custom configurations & material selection.
Order 1 sample. Or order 100K+ units. Or anything in between.
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Product details

Top highlights

Double-thick side walls provide high lateral crush resistance
Assembles manually via friction locks without adhesive
Front tuck flap and side ears secure the lid

About this product

The die-cut mailer box is a one-piece corrugated package that folds into a rigid tray with a hinged lid. By rolling its long side walls 180 degrees inward, the design creates a double-thick lateral barrier and a clean interior free of raw corrugated flutes.

The lid secures itself using a front tuck flap equipped with side locking ears, often called cherry locks. This friction-fit closure provides a clean presentation for e-commerce, subscription kits, and retail goods without requiring glue during assembly.

Common uses

E-commerce apparel and soft goods
Subscription boxes
Consumer electronics and hardware
Retail and sales kits

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E-commerce, Subscription Kits, and Retail Presentation

E-commerce apparel and soft goods

The unglued interior ensures no adhesive residue touches the product. The double-wall sides protect against lateral impacts during transit, while the hinged lid offers a framed presentation when the customer opens the package.

Subscription boxes

The friction-fit closure allows the box to be opened and closed repeatedly without destroying the corrugated board, making it useful for monthly deliveries that customers may keep for storage.

Consumer electronics and hardware

The rigid side walls keep heavy or dense components from bowing the box outward. The clean interior provides a smooth surface for custom inserts or molded pulp trays.

Retail and sales kits

The clean lines and mechanical closure provide a high-quality feel for sales demonstrations, allowing representatives to open and close the kit multiple times.

Manual Pack Benches, Return-Heavy Retail, and High-End Unboxing

Manual pack benches

Because the box requires no glue or tape to erect the base, operators can assemble it entirely by hand. Pre-breaking the side creases speeds up the folding rhythm.

Return-heavy retail

The mechanical closure remains intact after the first opening. Customers can easily re-pack items and close the lid securely for a return shipment.

High-end unboxing programs

The 180-degree roll-over side walls hide all raw corrugated edges along the sides of the tray, creating a polished frame around the product.

When to Consider a Different Mailer Style

High-speed automated packing

This box relies on manual folding and friction locks. If your fulfillment line uses automated folder-gluers or tray erectors, a machine-erected glued tray or a standard slotted carton will be much faster.

Heavy palletized distribution

The front wall is single-layer. If you are stacking heavy bulk goods high on a pallet, the front wall may buckle before the double-thick sides do. A standard shipping carton or a heavy-duty wrap-around box handles vertical weight better.

Close variants and lookalike dielines

The closest library neighbors include EVC41103, 0429a, EVC41111. Use this as a variant check if a buyer brings an old code, sample, or dieline that looks close. The deciding details are usually the lock, slot, closure, wall build, part count, or fold sequence.

Board Thickness, Surface Finish, Courier Sealing, and Insert Clearances

Board thickness and fold behavior

The 180-degree side roll-overs require precise fold allowances. Fine flutes fold crisply and lock tightly. Thicker boards, such as double-wall corrugated, will bind or crack on the hinges unless the die profile is specifically recalibrated for that exact caliper.

Surface finish and lock friction

The cherry locks rely on mechanical friction against the inner side walls. Applying a high-gloss varnish or lamination reduces paper friction, which can cause the lid to spring open more easily.

Courier sealing

While the cherry locks hold the lid shut for handling, rough parcel transit jolts the ears loose. Individual courier shipments usually require an external tape strip or a security label over the front edge.

Insert fit and interior clearance

The rolled walls create a clean, flush interior, which is excellent for inserts. However, the exact internal width must account for the double thickness of the side panels so your insert does not fit too tightly and bow the box.

Adjusting the Friction Lock, Corner Profiles, and Crease Widths

Locking ear clearance

The width and depth of the side locking ears can be tightened or loosened. A tighter fit increases security but requires more operator effort to close, while a looser fit speeds up packing but risks popping open.

Corner rounding on tuck flaps

Adjusting the radius on the lid and tuck corners smooths insertion. Rounder corners prevent the ears from catching on the inner walls during fast manual assembly.

Double-crease width

The distance between the parallel roll-over scores must be tuned to match the exact board caliper. This prevents the side walls from cracking or bowing when folded 180 degrees.

Board and packing details

Blank sprawl and material footprint

The flat, unfolded shape of this mailer resembles a large cross. This extended footprint creates more corner offcut waste during die-cutting than a standard slotted box.

Clearance and Lock Variants

Clearance-adjusted profiles

Variants introduce specific corner rounding and fold-allowance shifts. These are tuned die profiles that ensure the friction locks seat correctly when using specific board grades.

Additional notes

Testing lock friction before production

Because the closure relies entirely on mechanical friction, always test a physical sample cut from the exact board grade and surface finish you plan to use. This confirms the ears slide in smoothly without tearing and hold securely without popping open.

FAQs

Shipping and Route

Can this box ship through parcel networks without tape?

The friction locks keep the lid closed during normal handling, but drop shocks in a courier network cause the ears to pop out. We recommend an external tape strip or a tamper-evident label across the front edge for individual parcel shipping.

Board and Material

Can we make this mailer out of heavy double-wall board?

It is possible, but it requires careful engineering. The side walls must roll over 180 degrees to lock. Thick board cracks at the hinge or fails to reach the locking slots unless the fold clearances are specifically adjusted for that exact material.

Packing Labor

How long does it take to assemble?

An experienced operator folds it in seconds, but it is a two-handed manual process. You must hold the inner flaps upright while rolling the outer side walls over them. It is slower to erect than a pre-glued crash-lock base.

Print and Finish

Does a glossy finish affect how the box stays closed?

Yes. The side ears rely on paper-on-paper friction to stay tucked. High-gloss coatings or laminations reduce that friction, making the lid more likely to spring open. We adjust the lock geometry to compensate if a slick finish is required.

Inserts and Fit

Does the rolled side wall interfere with custom inserts?

Quantity and Production Path

Why does the flat blank shape matter?

The flat blank has a large, cross-like shape with extended flaps for the lid and roll-over sides. This creates more offcut waste during manufacturing than a simple rectangular box. It also requires flatbed or rotary die-cutting.

Retail and Presentation

Is this box suitable for customer returns?

Yes. The friction-fit cherry locks allow the customer to open and reclose the lid multiple times without destroying the structural board, making it highly reusable for return shipments.

Storage and Stacking

How much vertical weight can this mailer support?

The double-thick side walls provide excellent lateral crush resistance, but the front wall is single-layer and buckles first under heavy pallet loads. It is best stacked flat or shipped inside a master carton for bulk transit.