What does HC mean or what is HC on a shipping container?
In the field of international transport, storage and modular construction, you will very often encounter the abbreviation HC on a shipping container. This article provides the most comprehensive, technically detailed and practice-tested analysis of the term High Cube (HC) including its meaning, technical parameters, comparisons, legislation, safety and examples of use.
High Cube (HC) – basic definition, meaning and distinction
HC means High Cube – that is, a “high cubic” container, which is a special variant of a standard shipping container with increased height.
- Basic difference: Compared to a standard container (standard/GP/DV), an HC container is higher by approximately 1 foot (approx. 30 cm).
- Standard height: 8 feet 6 inches (2.59 m)
- High Cube height: 9 feet 6 inches (2.90 m)
- Typical lengths: 40′ (most common), 20′, less 45′ (or even 48′)
- Typical designation: 40’HC, 20’HC, 45’HC
This increased profile means up to 12–15%25 greater internal volume and allows efficient transport or storage of bulkier goods, taller equipment or better space utilization, for example when stacking pallets.
Technical standards and standardization: ISO 6346 and ČSN EN ISO 6346
What is ISO 6346?
ISO 6346 is an international standard for coding, identification and marking of shipping containers used in intermodal transport (ships, railways, roads). It introduces a uniform marking system that facilitates tracking, management, security inspections and logistics automation.
Main elements of the standard:
- Container owner identification code (four-letter prefix)
- Container serial number (six digits)
- Check digit
- Size and type code (e.g. 45G1 for 40’HC Dry Van)
- Mandatory and optional markings, including safety and operational data
Practical significance:
- Each High Cube container is clearly marked according to ISO 6346
- The second digit in the size code is “5” (e.g. 45G1, 25G1)
- The standard applies throughout the EU (ČSN EN ISO 6346), latest edition 11/2022, effective from 12/2022
Safety legislation:
In addition to ISO 6346, HC containers must meet the requirements of:
- International Convention for Safe Containers (CSC, IMO 1972, as amended)
- Customs Convention on Containers (1956, 1972) and Istanbul Convention (1990)
- Czech technical standards and laws concerning transport and storage
Dimensions, weights and capacity of High Cube container
Comparison table: Dimensions and parameters
| Specification | 20′ HC | 40′ HC | 45′ HC |
|---|---|---|---|
| External length | 6 058 mm | 12 192 mm | 13 716 mm |
| External width | 2 438 mm | 2 438 mm | 2 438 mm |
| External height | 2 896 mm | 2 896 mm | 2 896 mm |
| Internal length | 5 898 mm | 12 032 mm | 13 556 mm |
| Internal width | 2 352 mm | 2 352 mm | 2 352 mm |
| Internal height | 2 698 mm | 2 698 mm | 2 698 mm |
| Door height | 2 585 mm | 2 585 mm | 2 585 mm |
| Volume | ~37.3 m³ | ~76.4 m³ | ~86.1 m³ |
| Tare (empty) | ~2 300 kg | 3 900–4 200 kg | ~4 800 kg |
| Max. load | up to 28 180 kg | up to 28 600 kg | up to 27 700 kg |
Pallet capacity (1 layer on floor)
- Euro pallet (1 200 × 800 mm): 25 pcs (40’HC), 33 pcs (special “pallet wide” HC)
- US pallet (1 219 × 1 016 mm): 21 pcs (40’HC)
Construction material and durability
- Corten steel (COR-TEN) – extreme resistance to corrosion, weather effects, mechanical damage and seawater.
- Floor: Marine plywood (28–30 mm), load capacity min. 6 000 kg of evenly distributed load.
- Corner elements (corner castings): 8x, according to ISO for safe stacking and handling.
- Doors: Double, lockable, with possibility of sealing.
Safety, operational and legislative aspects of HC containers
- Each HC container must be watertight, with door and weld sealing, tested by pressure/water test.
- Stackability: The design allows stacking of up to 8–9 containers on top of each other (according to ISO and condition).
- Marking: Yellow-black stripes in the upper part (warning of increased height).
- Handling safety: Obligation to comply with weight limits (tractor, railway, crane), check stability during loading/unloading, proper cargo securing.
- Legislation: Must also comply with transport requirements (road weight limits, permits for excessive height on certain routes).
Practical use of High Cube container
Transport and storage
- Light, bulky cargo: Ideal for furniture, insulation materials, plastic products, textiles, packaged goods.
- High machinery and equipment: Industrial technologies, agricultural and construction equipment that exceed standard container height.
- Pallet optimization: Ability to stack multiple layers of goods/pallets, higher distribution efficiency.
Modular architecture and construction
- Housing, offices, shops: HC containers form the basis for modern “cargotecture” – container houses, kindergartens, cafes, shipping container homes, workshops, receptions.
- Height advantage: Ceiling 2.7 m allows comfortable interior, easy installation of insulation, wiring, suspended ceilings, without feeling cramped.
- Industrial applications: Mobile warehouses, technology cells, employee facilities, construction cells, workshops, kiosks.
Special variants of HC containers
- Reefer High Cube: Refrigerated containers with extra height to compensate for insulation and cooling unit.
- Open Top HC: For extremely high cargo, possibility of loading by crane from above.
- Side Door HC: Side opening for easier handling of long objects.
Maintenance, service and lifespan of HC containers
- Corten steel significantly slows down corrosion (special patina), but requires regular inspection of coatings and sealing.
- Floor: Inspection of condition, possible replacement of marine plywood.
- Doors and sealing: Regular maintenance of hinges, lubrication, replacement of sealing gaskets.
- Inspection: At least 1× per year inspection of tightness, condition of welds, function of all safety elements.
- Lifespan: In normal operation 12–20 years, with secondary use (warehouse, construction, conversion into container home) even longer.
Comparison of HC vs. standard (GP/DV) container
| Property | 40′ High Cube (HC) | 40′ Standard (DV/GP) |
|---|---|---|
| External height | 2,896 mm | 2,591 mm |
| Internal height | 2,698 mm | 2,393 mm |
| Volume | 76.4 m³ | 67.6 m³ |
| Euro pallet capacity | 25 | 25 |
| Price (new/used) | ± same | ± same |
| Availability | High | High |
| Use | Light, bulky cargo, high objects, architecture | Heavy, dense cargo |
| Advantage | Flexibility, comfort, variability | Availability, lower stacking height |
Most frequently asked questions and answers (FAQ)
Is an HC container always more expensive than standard?
No, especially for 40′ length the price difference is minimal. For 20’HC the price may be slightly higher due to lower availability.
Can I get a 40’HC instead of an ordered 40’GP?
Yes, it is often common practice without surcharge (so-called high-level substitution), especially when GP is not in stock. Advantageous for the customer, disadvantageous only with height restrictions at the destination.
How do I recognize an HC container?
By height, yellow-black marking and especially by ISO code (second digit “5”, e.g. 45G1).
What is the maintenance and lifespan of an HC container?
With regular maintenance (coatings, sealing, floor) the lifespan in transport is 12–20 years, with secondary use longer.
Glossary of related terms
- GP (General Purpose): Standard dry container (8’6″ height)
- DC (Dry Container): Synonym for GP
- Reefer: Refrigerated container (also in HC variant)
- Open Top: Container with open roof (also HC)
- Flat Rack: Without side walls, for oversized cargo
- Tare: Weight of empty container
- Payload: Maximum allowable container load
- CSC Plate: Safety label according to international convention
- Corner Casting: Corner element for handling and stacking
- Pallet Wide: Special wider HC container for 33 EUR pallets
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