40ft & 20ft High Cube Double Door Dry Cargo Container

Engineered for bidirectional loading, sequential cargo distribution, and oversized freight handling, the High Cube Double Door (HC DD) Dry Cargo Container features full-width cargo doors installed at both end frames. Built to ISO standards from Corten A weathering steel and certified for international intermodal transport, this configuration eliminates single-point loading bottlenecks in complex supply chains.

Technical Specifications

Parameter	20ft High Cube Double Door	40ft High Cube Double Door
External Dimensions (L x W x H)	6,058 x 2,438 x 2,896 mm (19'10'' x 8'0'' x 9'6'')	12,192 x 2,438 x 2,896 mm (40'0'' x 8'0'' x 9'6'')
Internal Dimensions (L x W x H)	5,898 x 2,352 x 2,698 mm	12,032 x 2,352 x 2,698 mm
Door Opening Clearance (W x H)	2,340 x 2,585 mm	2,340 x 2,585 mm
Cubic Capacity	37.4 m3 (1,321 cu ft)	76.4 m3 (2,698 cu ft)
Tare Weight	2,450 kg (5,400 lbs)	4,100 kg (9,040 lbs)
Max Gross Mass (Rating)	30,480 kg (67,200 lbs)	32,500 kg (71,650 lbs)
Max Net Payload	28,030 kg (61,800 lbs)	28,400 kg (62,600 lbs)
Floor Load Capacity	Forklift axle load: 7,200 kg per patch (142 x 142 mm tire footprint)

Material & Structural Engineering

Structural Steel Selection
Corten A (SPA-H) Weathering Steel: Applied to corrugated side walls, roof panels, and door panels. Forms a stable protective rust layer upon atmospheric exposure, arresting internal corrosion propagation.

Q355B / SPA-H Structural Profiles: Utilized for primary corner posts, bottom side rails, and end header/sill assemblies to absorb dynamic stacking loads (192,000 kg stacking test rating for 8-high tiering).

Dual-End Door Engineering
Full-Width Access: Both front and rear frames are engineered with rigid structural header beams and reinforced corner gussets to maintain racking and torsional stability despite dual door cutouts.

Hardware Assembly: Each door leaf is secured by 4 hot-dip galvanized vertical locking cam-lock rods, forged steel hinges, and stainless steel door retainers.

Weather Sealing: Triple-fin EPDM rubber gaskets vulcanized at corners to prevent water ingress under 30 kPa water jet testing.

Flooring & Substructure
Marine-Grade Plywood: 28mm thick Apitong or Keruing hardwood multi-layer composite flooring treated with termite-resistant and waterproof preservatives.

Crossmember Support: C-type steel floor crossmembers spaced at 303mm intervals, welded continuously to bottom side rails to support heavy forklift wheel loads during stuffing and stripping.

Manufacturing & Quality Control Process

Steel Preparation:

Raw steel plates undergo automatic shot-blasting to Sa 2.5 surface cleanliness standard, followed immediately by application of shop-primer weldable coating to prevent flash rust.

Precision Press Braking & Robotic Welding:

Side wall corrugation formed via 2,500-ton hydraulic presses. Main structural frame welding executed via MIG/CO2 shielding processes performed by certified welders in accordance with AWS D1.1 standards.

Anti-Corrosion Surface Treatment:

Degreasing and freshwater rinsing.
Zinc-rich epoxy primer application (dry film thickness >= 40 um).
Intermediate build coat and marine-grade polyurethane topcoat (>= 80 um), yielding a total dry film thickness exceeding 120 um.

Rigorous Factory Testing:
Watertightness Test: Internal high-pressure water spray test (0.1 MPa nozzle pressure) across all seams and double-door gaskets.

Dimensional & Squareness Check: Laser verification of diagonal tolerances (+/- 2.5 mm) and ISO corner casting alignment.

Load & Racking Testing: Prototype lifting, floor concentrated load testing, and end-wall deflection tests per ISO 1496-1 specifications.

Compliance & Certifications

ISO Certification: Manufactured in strict compliance with ISO 668 (Classification, dimensions and ratings), ISO 1496-1 (Specification and testing for series 1 freight containers), and ISO 6346 (Coding, identification and marking).

CSC Safety Approval: Every container is certified under the International Convention for Safe Containers (CSC), issued by classification societies such as ABS, BV, LR, or CCS.

Customs Compliance: TIR (Transport International Routier) approval for international customs transit sealed operations.

Application Scenarios

Sequential Multi-Drop Distribution: Ideal for supply chains requiring cargo unloading at multiple sequential ports or inland distribution hubs without un-stacking or shifting prior freight.

Oversized Machinery & Long Profile Stuffing: Allows long structural steel beams, timber bundles, or wheeled industrial equipment to be driven directly in through the rear doors and out or accessed via the front doors.

Custom Modular Enclosures: Utilized by engineering contractors as dual-room mobile field offices, generator enclosures, or segregated chemical storage units with physical partitions between front and rear compartments.

FAQ

Q: Does installing double doors at both ends reduce the structural stacking strength of the container?

A: No. While removing a solid corrugated end wall alters structural rigidity, our engineering design incorporates reinforced box-section corner posts, heavy-duty header and sill lintels, and thicker gusset plates at both end frames. This configuration maintains full ISO 1496-1 compliance, supporting an 8-high tier stack at maximum gross weight (30,480 kg per 20ft unit).

Q: How is water ingress prevented around the dual door assemblies?

A: The double door system utilizes multi-fin EPDM rubber gaskets pressed tightly against door frames via 4-bar cam-lock gear rods. The design passes rigorous factory water jet tests (100 kPa nozzle pressure) to ensure zero moisture penetration during open-ocean transit and severe weather conditions.

Q: What is the standard coating lifespan in marine environments?

A: Containers are finished with a multi-layer marine coating system comprising a zinc-rich epoxy primer and polyurethane topcoat with a total dry film thickness exceeding 120 um. Under standard marine transport conditions, the coating resists salt spray corrosion for 5 to 7 years before major touch-up maintenance is required.

Q: Can these containers be customized with forklift pockets or special tie-down anchor points?

A: Yes. Optional factory configurations include internal lashing rings welded to top/bottom side rails (rated up to 2,000 kg pull strength), gooseneck tunnel recesses (for 40ft units), and fork lift pockets built into the bottom side rail structure per client specifications.

Q: What documentation is supplied with a batch production order?

A: Each shipment includes individual manufacturer test certificates, classification society CSC safety approval certificates, builder's dimensional inspection reports, and official structural test documentation.

Request a Technical Quote & Specification Review

To request factory-direct pricing, custom fabrication options (such as specialized lashing points or CSC batch certification), or container logistics planning for your fleet, submit your requirements to our engineering team:

Required Container Type: 20ft / 40ft High Cube Double Door

Order Volume / Batch Size: (e.g., Trial lot of 2 units, or regular bulk batch orders)

Destination Port / Delivery Location:

Target Delivery Timeline:

[Submit RFQ / Contact Our Engineering Team]

Hot Tags: high cube double door dry cargo container, China high cube double door dry cargo container suppliers, factory