Self-Locking Tray — Model 4

Reading the code FEFCO 0433

The 04 series holds the folder-type boxes and trays: usually one-piece, unglued constructions erected by folding the die-cut blank around or under the product. This is the series of trays, folders and mailers that hold their shape by geometry — locking tabs, ears and hinged lids instead of a glued joint.

Within the series, 0433 is the design published as the Self Locking Tray. The four-digit code carries the full structural intent — specify it to any converter and both sides mean the same construction; only dimensions and board grade remain to be agreed.

How the structure behaves

The blank folds into a tray whose walls lock by geometry — tabs and slots cut into the blank engage as the walls fold up, so the tray erects by hand without glue, tape or stitching. Codes in this cluster share the self-locking principle and differ in wall build and lock detail; the 3D fold preview is the quickest way to see how this one closes.

Typical uses

Unglued self-locking trays are erected at the point of use: produce and bakery trays, transit trays for jars and cans, counter-top and display trays, and inner trays that organize a larger pack.

Dimensions and board

The parameters above — internal length, width and depth, plus any construction-specific values this style needs — drive the whole blank: panel layout, flap depths and slot positions all derive from them, validated against the template's supported range. The 2D dieline and the 3D fold preview regenerate together from the same parametric structure.

A corrugated dieline is a starting point for production, not a substitute for converter judgment: flute profile, board grade and joint style all affect final dimensions and crush behavior. Confirm tolerances and material with your manufacturer before mass production — and erect the structure on screen first, so flap collisions and proportion problems surface before any tooling is ordered.

What is Self-Locking Tray — Model 4?

FEFCO 0433 is the corrugated design published in the FEFCO International Fibreboard Case Code as the Self Locking Tray; the four-digit code specifies the full construction, leaving only dimensions and board grade to agree.

Which dimensions does the Self-Locking Tray — Model 4 dieline need?

4 parameters drive the blank: L (length), W (width), D (depth), Corrugated cardboard thickness (mm). Each value is validated against the template's supported range, and the whole dieline regenerates from them.

Can I see how Self-Locking Tray — Model 4 folds before cutting it?

Yes. The interactive 3D fold preview and the 2D dieline are generated from the same parametric structure, so the fold you watch on screen is the geometry of the sheet you cut. Open the template in the preview studio to fold it at your own dimensions.