Overview & Product Definition

40ft High Cube Double Door Container | Technical Specification & RFQ Guide

The High Cube Double Door Standard Container (designated as a 40ft HC tunnel container) integrates the increased vertical clearance of a High Cube unit (9 feet 6 inches) with cargo access doors fitted at both end frames. Manufactured to ISO 668 and ISO 1496 specifications, this unit eliminates single-end loading bottlenecks, enabling parallel material handling, reduced turnaround times, and simplified retrieval for serialized or oversized industrial freight.

Technical Specifications

Parameter	Metric Specifications	Imperial Specifications
External Dimensions (L x W x H)	12,192 mm x 2,438 mm x 2,896 mm	40'0" x 8'0" x 9'6"
Internal Dimensions (L x W x H)	12,032 mm x 2,350 mm x 2,695 mm	39'5" x 7'8" x 8'10"
Door Opening Size (Both Ends W x H)	2,340 mm x 2,585 mm	7'8" x 8'5"
Cubic Capacity	76.2 m3	2,691 cu.ft
Tare Weight	4,150 kg	9,150 lbs
Max Gross Weight (Rating)	32,500 kg	71,650 lbs
Payload Capacity	28,350 kg	62,500 lbs

Materials, Manufacturing & Structural Engineering

Steel Grades & Corrosion Protection
Structural Frame & Corrugated Panels: JIS SPA-H / Corten-A weathering steel. Copper, chromium, and nickel alloyed to form a protective patina, reducing atmospheric corrosion rates by 60% compared to standard structural carbon steel (Q235/SS400).

Surface Preparation: Sa 2.5 abrasive blast cleaning executed prior to coating application.

Paint System: 3-layer marine-grade coating system (Zinc-rich epoxy primer + Build coat + Acrylic polyurethane topcoat) totaling a minimum dry film thickness (DFT) of 80 to 120 microns, verified per ASTM B117 salt spray testing standards (minimum 500 hours without blistering).

Dual-End Door Assembly & Corner Posts
Corner Castings: Drop-forged SCW490 steel conforming to ISO 1161 requirements, welded to corner posts via full-penetration robotic GMAW (Gas Metal Arc Welding).

Door Gaskets: EPDM rubber double-joggled gaskets resistant to UV degradation and extreme operational temperatures (-40°C to +70°C), ensuring absolute watertight integrity.

Locking Gear: Galvanized cam keepers, forged steel cams, and lock rods outfitted with anti-theft lock boxes as standard.

Flooring & Undercarriage
Floor Material: 28mm thick Apitong or Keruing marine-grade hardwood plywood, treated with anti-fungal preservatives and secured to crossmembers using countersunk M8 self-tapping screws.

Floor Load Limits: Engineered and tested to support a 7,270 kg fork truck axle load per ISO 1496-1 rolling test criteria.

Crossmembers: Cold-formed C-channel steel profiles welded directly to bottom side rails.

Manufacturing & Quality Control Protocol

Weld Inspection: 100% Visual inspection supplemented by Ultrasonic Testing (UT) on critical structural corner post welds per AWS D1.1 standards.

Watertight Testing: Every unit undergoes a high-pressure rotating water jet test (minimum nozzle pressure 1 bar) prior to factory release to detect micro-leaks.

Certificates Supplied: Classification Society Certification (ABS, BV, LR, or CCS) and Safety Approval Plate (CSC) valid for international multi-modal transit.

Application Matrix: When to Select Double Door Containers

Operational Challenge	Standard Container Limitation	Double Door Container Solution
Cargo Retrieval	LIFO (Last-In, First-Out) requires unloading entire contents to reach rear items.	FIFO (First-In, First-Out) or direct access from either end, eliminating double handling.
Long Cargo Loading	Restricted to side-door or single-end crane hoisting for extra-long equipment.	Straight-through tunnel insertion reduces loading time by up to 50%.
Cross-Docking Hubs	Slow throughput due to single bottleneck entry point.	Parallel loading paths accelerate terminal processing speeds.

Procurement Decision & Customization Options

When finalizing an RFQ for High Cube Double Door containers, evaluate the following configuration options based on operational requirements:

Forklift Pockets: Optional internal/external pocket configurations welded into base structure.

Ventilation: Passive louver vents or mechanical ventilation cowls to control internal condensation.

Interior Lining: Food-grade stainless steel panels, plywood sheathing, or spray foam thermal insulation for temperature-sensitive cargo.

Color Customization: RAL standard exterior paint matching corporate fleet guidelines.

FAQ

Q: Does the inclusion of doors at both ends compromise the structural racking strength of the 40ft container?

A: No. To compensate for the second door set, structural engineers increase the section modulus of the rear corner posts and header/sillar assemblies. Finite Element Analysis (FEA) and physical prototype testing confirm that torsional rigidity and stacking strength meet ISO 1496-1 requirements (rated for 9-tier high-cube stacking at 24,000 kg per container).

Q: What is the typical lead time for bulk orders of customized double door containers?

A: Standard production lead time is 25 to 35 days from receipt of drawing approval and deposit. Exact timelines depend on factory production schedules and custom paint or floor specification requirements.

Q: Are these containers certified for international rail, road, and marine freight transport?

A: Yes. Units are delivered with a valid CSC (Convention for Safe Containers) safety approval plate certified by major classification societies (ABS, BV, LR, or DNV), making them fully compliant for international shipping lines and intermodal rail transport.

Q: What is the recommended maintenance schedule for the dual-end door rubber gaskets?

A: Inspect EPDM gaskets every 6 months for cracking, hardening, or compression set. Clean with mild soapy water and apply silicone-based protectant annually to maintain elastomeric flexibility in extreme climates.