20ft High Cube Shipping Container | ISO Standard & Engineering Specifications

Dimensional & Load Capacity Parameters

Parameter	Metric Value	Imperial Value
External Length	6,058 mm	19 ft 10.5 in
External Width	2,438 mm	8 ft 0 in
External Height	2,896 mm	9 ft 6 in
Internal Length	5,898 mm	19 ft 4.2 in
Internal Width	2,352 mm	7 ft 8.6 in
Internal Height	2,698 mm	8 ft 10.2 in
Door Aperture Width	2,340 mm	7 ft 8 in
Door Aperture Height	2,585 mm	8 ft 5.8 in
Max Gross Weight (MGW)	30,480 kg	67,200 lbs
Tare Weight (Unladen)	~2,330 kg to 2,500 kg	5,137 lbs to 5,511 lbs
Max Payload Capacity	27,980 kg to 28,150 kg	61,685 lbs to 62,063 lbs
Internal Cubic Capacity	37.4 m3	1,321 cu ft

Structural Material Composition

Corner Castings: Drop-forged steel manufactured to ISO 1161 specifications. Each casting undergoes 100 percent magnetic particle or ultrasonic testing to verify load-bearing capacity under dynamic crane spreader stress.

Corrugated Panels: Vertical walls and roof panels utilize JIS SPA-H Corten weathering steel, 1.6mm or 2.0mm nominal thickness. The 36mm trapezoidal profile depth mitigates metal fatigue under cyclic wind-shear loads during ocean voyages.

Flooring System: 28mm thick marine-grade waterproof plywood (Apitong or Gurjan hardwood composite), secured to crossmembers utilizing M8 countersunk self-tapping steel screws spaced at 150mm intervals along door thresholds.

Understructure: Rolled steel transverse channel crossmembers welded at 300mm spacing to withstand concentrated forklift axle loads up to 7,260 kg per 4-wheel set.

Manufacturing Processes & Quality Control

Surface Preparation:

Steel plates undergo automated centrifugal shot-blasting to Sa 2.5 surface cleanliness (ISO 8501-1) to eliminate mill scale and oxidation prior to assembly.

Welding Protocols:

Continuous MIG/MAG welding executed by operators certified to AWS D1.1 or EN ISO 9606 standards. Primary structural joints are subjected to non-destructive testing (NDT).

Coating Specification:

Primary shop primer: Zinc-rich epoxy (40 microns DFT).
Intermediate coat: High-build epoxy (80 microns DFT).
Topcoat: Polyurethane finish (40–50 microns DFT, RAL color matched). Total dry film thickness (DFT) exceeds 160 microns.

Watertight Integrity Verification:

Finished units undergo high-pressure rotary water-jet testing (nozzle pressure >= 1 bar, traverse speed <= 1.5 m/s) across all roof seams, side panels, and door rubber gaskets to confirm zero water ingress.

Dimensional Tolerance:

Laser calibration guarantees squareness errors across diagonals do not exceed 6mm, preventing container jamming in vertical cellular ship guides.

Industrial Applications

Oversized Machinery Transport: Accommodates tall vertical pumps, electrical distribution switchgear, and skid-mounted industrial equipment exceeding standard 2,392 mm dry van height limits.

Modular Enclosure Integration: Used by structural conversion contractors as protective outer housings for solar inverter stations, backup diesel generators, and remote telecommunication hubs.

Industrial Site Storage: Deployed on construction and mining sites for secure, weather-resistant tool and heavy spare-parts warehousing.

Regulatory Compliance & Certification

CSC (Convention for Safe Containers): Safety approval plate affixed to the exterior right door, authorizing structural stacking up to 9 tiers high (rated at 24,000 kg stack weight per tier).

Classification Societies: Inspection certificates issued by Bureau Veritas (BV), American Bureau of Shipping (ABS), or DNV upon request.

Customs Sealing: Fitted with TIR-compliant customs-approved wire-sealing eyelets on locking cam keepers for international cross-border transit.

Procurement & Logistics Support

Supply Condition: Available as brand-new units (One-trip ex-factory release) or certified cargo-worthy secondhand inventory.

Transport Logistics: Shipped via multi-axle tilt-deck trailers, side-loader trucks, or flatbed configurations. Depot pick-up arrangements available at key global multimodal hubs.

Engineering Modifications: Factory-level pre-delivery installation of lashing rings, ventilation louvers, personnel access doors, and electrical raceways.

FAQ

Q: What is the exact internal height difference between a standard 20ft container and a 20ft High Cube?

A: A standard 20ft dry van provides an internal height of 2,392 mm (7 ft 10 in), whereas the 20ft High Cube offers 2,698 mm (8 ft 10 in). This yields an additional 306 mm of vertical clearance.

Q: Are 20ft High Cube containers compatible with standard container chassis and spreaders?

A: Yes. Bottom and top corner castings conform strictly to ISO 668 dimensions. They lock onto standard semi-trailer twist-locks and port gantry spreaders without requiring adapters.

Q: What is the maximum container stacking limit authorized by the CSC plate?

A: The corner posts are rated for an ultimate vertical stacking weight capacity of 86,400 kg, permitting up to 9 fully loaded containers to be stacked vertically in ship cell guides.

Q: Do these units come with an active CSC safety approval plate?

A: Yes. Every new unit leaves the factory with a verified CSC plate. The initial mandatory safety re-examination window is established at 5 years from the date of manufacture.

Q: How is internal condensation managed during extended ocean transits?

A: Units feature standard labyrinth-baffled ventilation ports (typically 2 to 4 vents) to facilitate passive ambient air exchange while blocking direct water spray penetration. For sensitive electronic or paper cargo, silica gel desiccant poles or anti-condensation ceiling insulation coatings can be applied during production.

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