Preview image
The real blank at this size, folded by the same engine as the studio. The artwork is a sample from a fictional brand — swap in your own in the editor.
FEFCO 0421Mailer
Large-letter box 330×230×20 dieline
F-flute box that stays under 25 mm thick outside. A ready-sized preset of the self-locking box with lid — change the length, width and height and every panel, tuck and glue flap is redrawn to match.
Inside330 × 230 × 20 mm
Outside335.4 × 231.8 × 21.8 mm
Flat blank418.1 × 518 mm
Download the dielinePro
Sign in to download. Dieline downloads are part of Pro: PDF, Illustrator, SVG and DXF, cut, crease and bleed on separate layers, without a watermark. See plans
- Reference
- FEFCO 0421
- Inside size
- Length 330 · Width 230 · Height 20 mm
- Size range
- Length 150–600 · Width 80–450 · Height 20–150 mm
- Manufacturing
- 334.5 × 230.9 × 20.9 mm score to score · inside vs outside sizes
- Parts
- One blank
- Board area
- 0.193 m² · about 1 up on a 720 × 1020 mm sheet
- Default board
- F-flute micro corrugated · 0.9 mm caliper
- Board options
- E-flute KE-flute WB-fluteF-flute
- Good for
The flat dieline
Exactly what the downloads contain, drawn from the template at its default size, with a 3 mm bleed. How to read a dieline.
- Crease
- Cut
- Bleed 3 mm
How the blank is sized
Score-to-score panel sizes of this FEFCO 0421 blank at the default size, with the formula each one follows. L, W and H are the inside dimensions; T is the board caliper (0.9 mm for F-flute micro corrugated). Change the size or board in the editor and every panel is recalculated.
| Panel | Size (mm) | Formula |
|---|---|---|
| Base | 334.5 × 230.9 | – × W + T |
| Front | 334.5 × 20.4 | – × H + T/2 |
| Back | 334.5 × 20.9 | – × H + T |
| Front ear ×2 | 20 × 18.1 | H × – |
| Back ear ×2 | 20 × 18.1 | H × – |
| Left end | 20 × 230.9 | H × W + T |
| Left end roll | 1.8 × 229.1 | – × W − T |
| Left end (inside) | 20 × 229.1 | H × W − T |
| Right end | 20 × 230.9 | H × W + T |
| Right end roll | 1.8 × 229.1 | – × W − T |
| Right end (inside) | 20 × 229.1 | H × W − T |
| Lid | 334.5 × 229.6 | – × W − T/2 |
| Front tuck | 327.3 × 16.2 | – |
Adjustable in the editor
Beyond the size and board, this structure exposes 5 options; the template and 3D preview follow each change.
- Front tuck depthmm
- Lock tonguescount
- Thumb notchon / off
- Notch radiusmm
- Lid lock3 options
The self-locking box with lid family
The same structure with sizes, boards and options set for a use.
Preset
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Similar structures
Other structures built in a similar way, matched on code family, category, closures and proportions.
Make this large-letter box 330×230×20 yours
Open it in the editor to set your size, drop artwork on each face, check bleed and safe areas, and export print-ready PDF with the dieline on its own layer — or stage it in a 3D scene for a mockup.