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After proving successful in Korea, the Transporter was developed into the Container Express (CONEX) box system in late 1952. Based on the Transporter, the size and capacity of the Conex were about the same, [ nb 1 ] but the system was made modular , by the addition of a smaller, half-size unit of 6 ft 3 in (1.91 m) long, 4 ft 3 in (1.30 m) wide ...
The ISO 668 standard has so far never standardized 10 ft (3 m) containers to be the same height as so-called "Standard-height", 8 ft 6 in (2.59 m), 20- and 40-foot containers. By the ISO standard, 10-foot (and previously included 5-ft and 6 1 ⁄ 2 -ft boxes) are only of unnamed, 8-foot (2.44 m) height.
In 1952 the U.S. Army developed the Transporter into the CONtainer EXpress or CONEX box system. The size and capacity of the Conex were about the same as the Transporter, [nb 1] but the system was made modular, by the addition of a smaller, half-size unit of 6 ft 3 in (1.91 m) long, 4 ft 3 in (1.30 m) wide and 6 ft 10 + 1 ⁄ 2 in (2.10 m) high.
However, in order to keep pace with the increase of container maximum gross weight, the continuing growth in container ship size, and the related height of container stacks on board the ships, the required stacking strength was increased to a superimposed weight of 213,360 kg (470,400 lb) in 2005 per Amendment 3. [8]
Second size code character: Code: Container length: Code: Container height: Width: 1 10 ft ... height marks for containers higher than 2,590 mm (8 ft 6 in) See also
Shipping containers conform to standard shipping sizes, which makes pre-fabricated modules easily transportable by ship, truck, or rail. Shipping container construction is still less expensive than conventional construction, despite metal fabrication and welding being considered specialized labor (which usually increases construction costs).
Specialized shipping containers include: high cube containers (providing an extra 1 ft (305 mm) in height to standard shipping containers), pallet wides, open tops, side loaders, double door or tunnel-tainers, and temperature controlled containers. Another specialized container, known as Transtainer, is a portable fuel and oil freight container.
The Container Handling Unit (CHU) is an add-on kit that allows for the loading/unloading and transport of standard 20 ft (6.1 m) ISO containers without the need for an intermediate flatrack. M1075 PLS trucks (with or without winch) can have an integral CHU stowage facility between the LHS hook arm and engine.