Does 350 kg static load mean I can load 350 kg of goods?

No. Static load is the pressure the bottom case can take; the goods it may carry follow the dynamic load (payload).

Can I exceed the rated stack by one layer?

Not recommended. The rating already includes margin; exceeding it consumes that margin, and shocks or uneven floors amplify the risk.

Why do same-volume cases differ so much externally?

Wall thickness, corner structure, hinges and stacking design all occupy external space. External differences directly affect container-loading efficiency — compare "load per pallet," not case volume.

Do heavy cases always need a pallet base?

It depends on handling. Forklift and lifting scenarios benefit greatly from base skids; pure manual short moves can use lighter non-skid designs. ---

Artillery Shell Box: Load Ratings, Stacking and Dimension Specifications Explained

Quick answer: Reading the specifications of an artillery shell box — a heavy-duty container for large-caliber ordnance-type items — means grasping three number systems: load rating (static and dynamic loads are different things), stacking (layer count and load-bearing zones are set by structure, not habit), and dimensions (internal cavity derives from content dimensions plus cushioning allowance; external size must fit logistics modules). This article explains the container side only; it does not address anything about handling the contents.

Reading the spec sheet: two classes of load
Load rating: static, dynamic and safety margin
Stacking: how the layer count is derived
Dimensions: cavity, external size and logistics modules
Acceptance checklist
FAQ

1. Reading the spec sheet: two classes of load

Heavy-duty container spec sheets always list two load figures with different meanings:

Static load (stacking load): the pressure the case can bear long-term while at the bottom of a stack — this governs stacking capability;
Dynamic load (payload): the weight the loaded case may be handled, lifted and subjected to drop shocks — this governs how much it can carry.

The most common misreading is using one for the other. A case rated 50 kg dynamic and 350 kg static can carry 50 kg of goods but support 350 kg of stacking on top. Each number serves its own condition; they are not interchangeable.

2. Load rating: static, dynamic and safety margin

Load rating has three layers:

Rated value: the figure on the spec sheet, a design target;
Safety margin: engineering practice leaves headroom above the rated value; the factor depends on material and duty, and should be stated in writing by the supplier;
Failure mode: overloading does not usually break the case instantly — ribs yield, lid lips deform, and sealing fails. An overloaded case that still "works" has already lost protective performance.

For high-density contents, weight concentration makes bottom structure and corner load paths the design focus — which is why heavy cases use reinforced corners and base skids.

3. Stacking: how the layer count is derived

Stacking layers are a simple division, not folklore:

Max stack layers ≈ base-case static load ÷ (loaded weight per case)

Example: static load 350 kg, loaded weight 45 kg → theoretical 7 layers; keeping 1–2 layers of margin gives a rated 5–6. Three points to confirm at purchase:

Load-bearing zones: only corner columns and ribs may take load; the unsupported middle of a lid lip must not be loaded;
Stack orientation: most heavy cases allow stacking in one orientation only; offset stacking cuts the load path;
Interlocks: stacking ribs or locating slots raise stability substantially above flat stacking.

4. Dimensions: cavity, external size and logistics modules

Dimensional specs follow three layers:

Layer	Determined by	Note
Internal cavity	Content dimensions + cushioning allowance	Allowance per side set by foam and positioning needs
External size	Cavity + wall thickness + structure space	Corners, hinges and latches occupy external space
Logistics fit	Pallet/container modules	External L×W should divide into 1200×1000 mm pallet modules

The logistics module is the most overlooked item in procurement: an external size that does not divide into pallet modules wastes container space and raises transport cost at volume. Common industrial practice is to size cases to divide pallet or container internal dimensions — verify with a simple layout mock-up before ordering.

5. Acceptance checklist

Both static and dynamic loads stated, with written definitions;
Stack rating accompanied by a load-zone diagram and orientation requirement;
Internal cavity verified against the agreed content with cushioning allowance (by physical sample);
External size verified against pallet/container modules (layout simulation);
Bottom structure and corner reinforcement documented;
Empty weight stated (affects manual handling and freight).

Six items make a spec sheet "acceptable". Missing items should be closed during sampling — not argued after mass production.

Conclusion

Reading artillery-shell-box specifications means putting each number back into its own condition: dynamic load governs what it can carry, static load governs what it can support, stack layers are the division of the two plus margin, and dimensions must satisfy both content cushioning and logistics modules. Checking the acceptance list item by item is what turns a spec sheet from decoration into a contract.

This article explains container-side specifications only. It does not address the handling, loading or use of any items placed inside.