Can a cartridge storage box cavity be the contents plus 10 mm?

No. That gives 5 mm a side while the foam wall alone is often 8 mm. Allow 20 mm and up.

Does a thicker wall resist drops better?

Not by itself. Drop performance depends on wall and rib spacing together; add thickness without moving the ribs and impact lands in the same place.

Is cartridge storage box stack height rated empty or loaded?

Loaded, and stated on the sheet. Six tiers empty and four loaded are different structures.

Is IP67 much dearer than IP65?

Within about 20%, driven by seal profile and latch count. The real cost is choosing wrong: indoors, IP67 makes every open and close harder.

Should unit weight appear in the contract?

Yes, empty and loaded, with about ±3% tolerance. Overweight usually means a wall out of tolerance.

Cartridge Storage Box Specifications: Size, Wall and Load

Quick answer: A cartridge storage box specification follows from four inputs: item outline, transport mode, stack height and store environment. Those four fix cavity size, wall thickness, lid load and sealing class; everything else is derived.

Four Inputs Behind a Cartridge Storage Box Specification
Cavity Size and Cell Layout
Wall Thickness and Ribbing
Load Capacity and Stacking Height
Sealing Class, Temperature Range and Unit Weight
FAQ

1. Four Inputs Behind a Cartridge Storage Box Specification

A cartridge storage box specification does not start with a size chart. It starts with what goes in, how it travels, how high it stacks and where it sits. Settle those four and the parameters lock.

Describe the contents to the item outline. A fifty-round carton needs about 30 mm more cavity height standing than lying flat, and square versus long cells is a question of finger clearance.

Input	Fixes	Starting value
Item outline	Cavity, cells	92 × 62 × 32 mm carton
Transport	Wall, latch count	2.8 mm and up for road
Stack height	Lid load, feet	Four tiers, 150 kg
Environment	Sealing class	IP67, −30 to +60 °C

Stack height is the input most often lost. “Stackable” invites a six-tier empty-case design while the store loads four full tiers, and the lid takes a set that shows as a misaligned seal.

2. Cavity Size and Cell Layout

Cavity comes from outline plus clearance. A 92 × 62 × 32 mm carton with 3 mm clearance a side gives a 98 × 68 × 170 mm cell, five cartons deep; with 8 mm foam walls, four cells across and three along fill a 480 × 320 × 180 mm cavity.

Cartridge storage box: closed black rotomolded case on a van floor, two push latches at the front, folding handles at both ends

More cells is not better. Sixteen pockets thins the shared wall from 8 mm to 5 mm and lateral support drops with it. If fingers enter from one side, the cell should not be walled equally on all four.

The cavity works out at 27.6 litres, which drives desiccant quantity and loaded weight. Overstate it and the interior runs dry; understate it and capacity fails.

3. Wall Thickness and Ribbing

Wall thickness balances load against weight. Injection-moulded polypropylene runs 2.8 to 3.2 mm; rotomoulded polyethylene 4.5 to 5.0 mm, because powder deposition varies about ±0.5 mm.

Ribs carry lid load into the side walls; 3 mm tall at 60 mm centres is a workable start. Past 80 mm the lid bulges before it cracks, and under 40 mm the rib root sinks.

Thickness converts to weight: each extra 0.5 mm adds about 0.6 kg, raising loaded weight and lowering stack height. A cartridge storage box sheet must show both together.

4. Load Capacity and Stacking Height

Three load cases apply: lifting, static stacking and transport shock. Static stacking is where the arithmetic fails, since it acts longest and plastic creeps throughout.

Cartridge storage box: three black cases stacked on a steel bench, latches in a row along the lid edge, cases on a rack behind

Stack height for a cartridge storage box back-calculates: 21.4 kg loaded against a 150 kg lid allowance gives seven tiers, and a factor of 1.75 brings it to four.

Feet and pockets belong together. A 12 mm foot with a 6 mm pocket self-aligns; hand-aligned stacks drift by the third tier and split the bottom corners.

5. Sealing Class, Temperature Range and Unit Weight

Sealing class on a cartridge storage box follows the store. IP65 covers an indoor room; IP67 means thirty minutes at one metre without ingress, paid for with a larger seal profile and four latches.

Write temperature as a pair: case −30 to +60 °C, seal −40 to +90 °C. When they do not match the seal fails first, and a wide-swing store needs a pressure valve.

Parameter	Value	Basis
Cavity	480 × 320 × 180 mm	Twelve cells plus clearance
Volume	27.6 L	Net dimensions multiplied
Lid load	150 kg	Back-calculated from four tiers
Ingress	IP67	One metre, thirty minutes
Weight	4.2 / 21.4 kg	3.0 mm wall plus contents

Unit weight is the last line on the sheet and the first one skipped. At 21.4 kg loaded it decides whether one person or two handle the case.

Conclusion

The specification of a cartridge storage box is a set of linked numbers: cavity from the outline, wall from process and load, stack height from lid capacity, sealing class from the store. Fix the inputs and the sheet has one answer, and a cartridge storage box specification holds together on site.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.