Product Overview & Structural Architecture

High Cube Double Door Shipping Containers | 20ft & 40ft Technical Specifications & Procurement Guide

A High Cube Double Door Shipping Container (commonly referred to as a tunnel container) integrates standard High Cube vertical clearance with full-opening, double-leaf swing doors at both end frames. This configuration eliminates single-end loading bottlenecks, establishing a continuous through-traffic workflow for pallet jacks and forklifts during high-turnover staging operations.

Core Dimensional & Weight 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	12,192 x 2,438 x 2,896 mm
Internal Dimensions (L x W x H)	5,844 x 2,352 x 2,698 mm	12,032 x 2,352 x 2,698 mm
Door Opening Width x Height	2,343 x 2,585 mm	2,343 x 2,585 mm
Max Gross Weight (Rating)	30,480 kg	32,500 kg
Tare Weight (Approx.)	2,350 kg	4,150 kg
Payload Capacity	28,130 kg	28,350 kg
Cubic Capacity	37.4 m3	76.2 m3

Material & Structural Engineering

Structural Steel Composition
Corrosion Resistance: Frame uprights, corner castings, and roof panels utilize JIS SPA-H (or equivalent Corten-A) weathering steel. The chemical composition integrates copper, chromium, and nickel to induce a stable, self-healing protective patina when exposed to marine and industrial atmospheres.

Corrugation Panels: 1.6 mm thick cold-rolled Corten steel panels featuring deep trapezoidal corrugations (depth: 36 mm) designed to withstand extreme lateral wind loads and vertical stacking loads up to 9 units high (laden at a cumulative stack weight of 216,000 kg).

Flooring System & Load Ratings
Decking Material: 28 mm thick Apitong (Keruing) tropical hardwood or marine-grade waterproof plywood, treated with anti-fungal and moisture-impermeable preservatives.

Floor Load Limits: Certified to support an inner forklift axle load of 7,260 kg per operational cycle, based on a dynamic contact patch of 142 x 142 mm per wheel.

Dual-End Locking Hardware & Sealing
Lockrods & Cams: Drop-forged steel lockrods (34 mm diameter) coupled with zinc-plated cam keepers and integrated anti-theft lock boxes.

Gaskets: EPDM rubber triple-fin gaskets vulcanized directly at the frame corners, engineered to maintain elastomeric flexibility across operating temperatures from -40C to +70C.

Manufacturing Process & Quality Control

Fabrication Workflow
Surface Preparation & Blasting: Raw structural steel plates and profiles undergo automatic centrifugal shot blasting to Sa 2.5 standard, removing mill scale and surface oxides prior to primer application.

Welding & Inspection: Semi-automated CO2 gas-shielded arc welding executed by certified personnel. Critical stress joints at corner castings and header junctions undergo rigorous Ultrasonic Testing (UT) or Magnetic Particle Inspection (MT).

Coating System (Total DFT >= 150 um):

Shop Primer: Zinc-rich epoxy primer (25 um).

Intermediate Coat: High-build epoxy build coat (75 um).

Topcoat: Chlorinated rubber or polyurethane exterior finish (50 um).

Mandatory Compliance & Certification
CSC (Convention for Safe Containers): Each manufactured unit bears an approved CSC safety plate certified by recognized classification societies (ABS, BV, LR, or DNV).

ISO Standards: Fully compliant with ISO 668 (Classification and dimensions), ISO 1161 (Corner fittings specification), and ISO 1496-1 (Specification and testing for freight containers).

TIR Certification: Compliant with customs requirements for international cross-border trucking and multimodal transport.

Application Selection Guide

Application Sector	Operational Requirement	Recommended Specification
Heavy Machinery Logistics	Dual-end access allows rapid loading/unloading of long conveyor modules or industrial skids without turning cargo.	40ft High Cube Double Door
Modular Site Setup	Utilized as secure, partitioned storage or workspace with separate entry/exit access points at opposite ends.	20ft High Cube Double Door
Automotive Supply Chain	Palletized parts staging where first-in, first-out (FIFO) inventory workflow requires directional throughput.	40ft High Cube Double Door

Procurement & RFQ Checklist

When submitting an inquiry or technical specification sheet for high cube double door containers, include the following parameters to accelerate technical review and quotation generation:
Container Size & Type: 20ft HC DD / 40ft HC DD

Order Volume & Incoterms: FOB / CIF port destination, minimum order quantity (MOQ)

Classification Society: ABS, BV, LR, or DNV certification preference

Floor Specification: Apitong hardwood vs. marine plywood

Color Coating: RAL number requirements for corporate fleet branding

Optional Accessories: Additional lashing rings, forklift pockets, or ventilation louvers

FAQ

Q: Does adding doors to both ends reduce the structural stacking capacity of the container?

A: No. The end frames are engineered with reinforced corner posts and increased header beam cross-sections to compensate for the dual door openings. ISO 668 stacking and racking load ratings remain fully compliant for 9-high empty/laden stacking configurations.

Q: What is the exact internal vertical clearance compared to standard containers?

A: High Cube containers provide an internal height of 2,698 mm (approx. 8ft 10in), offering an additional 300 mm (12 inches) of vertical clearance over standard-height 8ft 6in units.

Q: How is water ingress prevented at the secondary door set?

A: Both door sets utilize dual-ridge EPDM rubber gaskets combined with overlapping door frame channels and exterior rain deflectors, verified via ISO 1496 watertightness testing using high-pressure water jet streams (1.0 bar nozzle pressure).

Q: What is the standard factory lead time for bulk fleet orders?

A: Standard manufacturing cycle times range from 15 to 25 business days following technical drawing sign-off and receipt of commercial deposit, subject to steel plate supply availability and port logistics scheduling.

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