External label
Use it to identify a reference family—not to infer actual clear space.
SECTION CUT · S-00Measure the opening.
Measure the opening.
Then the inside.
A geometry-only atlas for comparing one recorded cargo envelope with a recorded door opening and internal box—before actual-unit and handling confirmation.
No booking · No payload approval · No loading-path simulation · No fit guarantee
A nominal label, clear doorway and inside box are different facts.
Door aperture
Width and height may be smaller than the internal cross-section.
Internal box
Record length, width and height for the specific source or actual unit.
Reference profiles start a question; they do not identify your unit.
CMA CGM catalogue examples reviewed 6 September 2026. Inside L×W×H and clear door W×H in millimetres.
20’ STD
- Inside
- 5,900 × 2,352 × 2,393
- Door
- 2,340 × 2,280
40’ STD
- Inside
- 12,034 × 2,352 × 2,395
- Door
- 2,340 × 2,280
40’ HC
- Inside
- 12,034 × 2,352 × 2,700
- Door
- 2,340 × 2,585
S-03 / CARGO ENVELOPE
One rectangular envelope. Six axis-aligned orientations.
The screen permutes length, width and height. It does not optimise multiple packages or simulate turning through a real approach.
- O-AL×W×H
- O-BL×H×W
- O-CW×L×H
- O-DW×H×L
- O-EH×L×W
- O-FH×W×L
S-04 / FIRST GATE
An ample interior cannot erase a narrow doorway.
Door width and height are tested independently before the internal length, width and height. Every blocked reason remains visible.
Inspect the aperture boundary →
S-05 / USER-SET ALLOWANCE
Keep cargo dimensions and clearance allowance separate.
If you enter an allowance, it is added once to every oriented envelope dimension. The site never invents a tolerance or rounds a near fit into a pass.
Geometry leaves critical questions unresolved.
S-07 / LOCAL SCREEN
Bring your recorded dimensions to the six-orientation screen.
Inputs stay in the current browser tab. Copying a measurement brief is deliberate; nothing is uploaded or sent automatically.
Open the inspector →
