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- ISO 668 - Series 1 freight containers — Classification, dimensions and ratings is an ISO international standard which classifies intermodal freight shipping containers nominally, and standardizes their sizes, measurements and weight specifications. The current version of the standard is the Seventh edition (2020), which integrates version E. The standard was prepared by Technical Committee ISO/TC 104: Freight containers, Subcommittee SC 1: General purpose containers. Introduced in 1968, ISO 668 currently regulates both external and internal dimensions of containers, as well as the minimum door opening sizes, where applicable. Minimum internal dimensions were earlier defined by ISO standard 1894: 'General purpose series 1 freight containers – Minimum internal dimensions'. Its second edition appeared in 1979, but was withdrawn, once revised by ISO 1496‑1 of 1990. ISO 1496‑1's current version is 2013, including Amendment 1 of 2016, last reviewed and reconfirmed in 2019. ISO 668 also specifies the respective associated gross weight ratings, and includes requirements for load transfer areas in the base structures of containers, since Amendment 1 of 2005.Amendment 2 of 2005 further added forty-five foot length containers to the standard. The maximum gross mass (MGM) rating of twenty- and thirty-foot length units was notably increased to 30,480 kg (67,200 lbs) by Amendment 1 of 2005. Until then, the MGM for 20-foot units was 24,000 kg (52,900 lbs), and for 30-foot boxes 25,400 kg (56,000 lbs). However, since Amendment 2 of 2016, the maximum gross mass for ISO-standard Series 1 containers of all sizes, (except 10‑foot units), has most recently been further increased to a maximum of 36,000 kg (79,370 lbs). Draft Amendment 1 of ISO 668: 2020 – for the eighth edition – maintains this. A separate standard is set for the required stacking strength, or 'maximum superimposed mass' (MSM) for standard containers. The ISO standard for Series 1 containers, ISO 1496‑1, established this, among other characteristics, for many years set at 192,000 kg (423,290 lbs). However, in order to keep pace with the increase of container maximum gross weight, the continuing growth of container-ships 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 in 2005 per Amendment 3. This value was since maintained in the latest revision of Standard 1496‑1 (2013). Production statistics show that the vast majority of containers have, for many years, been built with a stacking strength at or above the 213,000 kg figure stipulated in ISO 1496‑1. In fact, most major container operators and lessors now cause containers to be built above the required figure, with the most common superimposed strength being 216,000 kg. (en)
- ISO 668 - Series 1 freight containers — Classification, dimensions and ratings とは、インターモーダル輸送貨物コンテナを分類し、サイズと重量を規定するISO国際規格である。1967年に導入され、コンテナの内寸および外寸、開口ドアの最小サイズ（備える場合は）を規定している。2005年の改訂版では、コンテナ総重量、構造における重量バランス構造も規定している。 現行のバージョンは、2020年に定義された第7版であり、これはバージョンEが統合された。 (ja)
- ISO 668 «Контейнеры грузовые серии 1. Классификация, размеры и номинальные характеристики» — стандарт ISO, описывающий и классифицирующий серию 1 ISO-контейнеров по их внешним размерам. Он, также, определяет их грузонесущие мощности и, по необходимости, минимальные внутренние и дверные размеры. (ru)
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- ISO 668 - Series 1 freight containers — Classification, dimensions and ratings とは、インターモーダル輸送貨物コンテナを分類し、サイズと重量を規定するISO国際規格である。1967年に導入され、コンテナの内寸および外寸、開口ドアの最小サイズ（備える場合は）を規定している。2005年の改訂版では、コンテナ総重量、構造における重量バランス構造も規定している。 現行のバージョンは、2020年に定義された第7版であり、これはバージョンEが統合された。 (ja)
- ISO 668 «Контейнеры грузовые серии 1. Классификация, размеры и номинальные характеристики» — стандарт ISO, описывающий и классифицирующий серию 1 ISO-контейнеров по их внешним размерам. Он, также, определяет их грузонесущие мощности и, по необходимости, минимальные внутренние и дверные размеры. (ru)
- ISO 668 - Series 1 freight containers — Classification, dimensions and ratings is an ISO international standard which classifies intermodal freight shipping containers nominally, and standardizes their sizes, measurements and weight specifications. The current version of the standard is the Seventh edition (2020), which integrates version E. The standard was prepared by Technical Committee ISO/TC 104: Freight containers, Subcommittee SC 1: General purpose containers. (en)
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