Container norms explained, in plain language

Why container norms matter

A container looks like a box of steel. The norms behind it decide whether that box can ride a marine vessel, sit on a NATO base, hold a CE mark on European soil, or keep its resale value over twenty years. Confusing two norms, or accepting one that meets the wrong one, is the most common source of friction between specifier and supplier. The cost lands later, when the buyer discovers the container cannot be put on a vessel, invoiced into a defence framework, or insured for stacking on a public-sector site.

This article walks through the ten norms that matter most for buyers in Central and Western Europe. Each section explains what the norm covers, what the buyer can verify, and which of these Tanax Containers holds. Tanax is a manufacturer, not a trader: steel is cut, welded, blasted, painted, and dispatched from a single production hall in Bánovce nad Bebravou, Slovakia.

ISO family (668, 1496-1, 6346, 1CC)

The ISO family is the bedrock. Without these four references, a container is just a metal enclosure, not a freight container in any internationally recognised sense.

ISO 668 classifies series 1 freight containers by external dimensions and rating. The current edition is ISO 668:2020. It defines designations like 1CC (20 ft standard), 1AA (40 ft standard), 1AAA (40 ft high cube), and the rest of the series 1 family. External width is fixed at 2 438 mm. Standard height is 2 591 mm, high cube 2 896 mm. When a buyer specifies "20 ft DV" or "40 ft HC," they are reaching for the ISO 668 designation underneath.

ISO 1496-1 is the structural and testing specification for general purpose containers. It is where the load cases live: stacking, racking, lifting from corner castings, bottom transverse rigidity, top lift, side wall and end wall strength. The latest edition is ISO 1496-1:2013, with amendments in 2016 and 2024. When a tender asks for "ISO 1496-1 compliant," the buyer wants a unit that survives nine-high stacking and crane handling without permanent deformation.

ISO 6346 is the coding, identification, and marking system. Every certified container carries an eleven-character code: three letters for the owner (the BIC code, registered with the Bureau International des Containers), one letter for the equipment category (U for freight, J for detachable equipment, Z for trailers and chassis), six digits for the serial number, and one check digit. ISO 6346 also defines the size and type codes that customs authorities verify under the Customs Conventions on Containers. Over 99 percent of containers in international traffic carry an ISO 6346 marking.

ISO 1CC is the 20 ft standard container designation under ISO 668. In conversation, "1CC" often refers to the corner castings, the eight forged steel blocks that handle every lifting, locking, and stacking load. The casting standard itself is ISO 1161, rated for vertical loads up to 30 000 kg per corner, which is what makes a properly built container stackable nine high under ISO 3874 lashing.

Tanax builds 20 ft and 40 ft dry cubes to ISO 668 and ISO 1496-1, ships them with ISO 6346 BIC coding, and fits forged ISO 1CC corner castings before paint.

CSC plate

The Container Safety Convention was adopted in Geneva in December 1972 and entered into force in 1977. It is administered by the International Maritime Organization, ratified by every major shipping nation, and it is the legal instrument that decides whether a container can move in international transport.

The CSC plate, sometimes called the Combined Data Plate, is the physical evidence that a container has been approved under CSC. It measures at least 200 mm by 100 mm, is made of non-corrosive and fire-resistant material, and is fixed to the door so port inspectors can read it without opening the unit. On it: the classification society approval code, the manufacturer's identifying number, month and year of manufacture, maximum operating gross mass, allowable stacking weight at 1.8 g, racking test load, and the next inspection date.

Inspections run on one of two regimes. Under the Periodic Examination Scheme (PES), the next examination date is stamped onto the plate and updated after each inspection; the first must happen within five years of manufacture, then at intervals no greater than 30 months. Most operators run the Approved Continuous Examination Programme (ACEP), where the container is deemed inspected on each visit to an approved repair facility, and the ACEP number replaces the next-examination date on the plate.

For the buyer, the CSC plate is the line between a structural box and a freight container. Without it, no shipping line accepts the unit on a vessel, no insurer writes it for sea carriage, and no customs authority treats it as a freight container. Tanax issues a CSC plate with every ISO Standard container at handover.

EN family (1090-1 EXC2, ISO 3834-2)

The ISO family covers the container as a freight unit. The EN family covers the steel structure itself, under the European Construction Products Regulation. Anything sold as load-bearing steelwork inside the European Economic Area falls under EN 1090, and any welding shop feeding that line falls under EN ISO 3834.

EN 1090-1 is the standard for conformity assessment of structural steel and aluminium components. It is the gateway to CE marking. To put a structural steel component on the European market, the manufacturer must have its Factory Production Control system audited by a Notified Body, issue a Declaration of Performance, and apply the CE mark. EN 1090-1 references EN 1090-2 for the technical execution of steel structures.

EN 1090-2 sorts structures into four Execution Classes, EXC1 through EXC4, by consequence of failure and load type. EXC2 covers residential, commercial, and light industrial structures, warehouses, offices, and small bridges, the bulk of European steel fabrication. It requires qualified welding procedures (EN ISO 15614-1 or pre-qualified per EN ISO 15612), a named Welding Coordinator at minimum International Welding Specialist (IWS) level, weld traceability through the fabrication chain, and inspection by both visual and non-destructive methods. For containers used as accommodation, command posts, training modules, fuel cells, and any unit that becomes a building element on a European site, EXC2 is the floor.

EN ISO 3834-2 is the comprehensive quality requirement for fusion welding of metallic materials, the welding-shop side of the EN 1090 chain. The 3834 series has three levels: Comprehensive (3834-2), Standard (3834-3), and Elementary (3834-4). A shop running 3834-2 controls every step of the welding process: requirement review, welding procedure specifications, welder qualification under EN ISO 9606, consumable handling, equipment calibration, inspection, non-conformity handling, and full record retention.

Tanax operates EN ISO 3834-2 at the comprehensive level. The welding line feeds EN 1090-1 EXC2 capability, with welder qualification under EN ISO 9606 and surface preparation to EN ISO 8501 Sa 2.5.

Defence norms (AQAP 2110, NSPA CAGE)

European defence buyers ask for two things in addition to the civilian norms above: AQAP 2110, and an NSPA-issued CAGE code. Together they tell a contracting officer that the supplier is real, located, identified in the NATO codification system, and operating a quality management system that meets the alliance's expectations.

AQAP 2110 is the NATO Quality Assurance Requirements for Design, Development and Production. The latest published edition is AQAP 2110:2017, which is what Tanax holds. AQAP 2110 builds on ISO 9001 and adds NATO-specific requirements: configuration management, risk management aligned to defence projects, government quality assurance interfaces, and the reporting expected by a NATO procurement authority. Certification is granted by an accredited body and can only be issued when the supplier also holds ISO 9001. The Slovak Ministry of Defence, the Bundeswehr's BAAINBw, and equivalent bodies write AQAP 2110 into contract clauses for items where quality risk and complexity demand it.

NSPA CAGE is the Commercial and Government Entity code, the five-character alphanumeric identifier issued by the NATO Support and Procurement Agency. CAGE codes for US entities are issued by DLA; codes for entities outside the US and outside sponsored nations are issued by NSPA. The code is the entry point into the NATO codification system: every supplier doing business with a NATO procurement authority needs one. It links the supplier's name, address, and contact to a unique identifier any contracting officer in the alliance can verify. Tanax holds NATO CAGE 4094M, registered with NSPA in September 2025.

Together they close the loop. AQAP 2110 says the supplier runs a quality system the alliance recognises. The CAGE code says the supplier is the entity it claims to be.

Quality and environment (ISO 9001, ISO 14001)

ISO 9001 and ISO 14001 are the management system standards underneath everything else. They are not container specific. They tell the buyer that the supplier runs the business in a way that is repeatable, documented, and inspectable.

ISO 9001:2015 is the global reference for quality management systems. It is organised in ten clauses, with the auditable requirements running from clause 4 (context of the organisation) through clause 10 (improvement). The 2015 edition put emphasis on risk-based thinking, leadership engagement, and continual improvement under the Plan-Do-Check-Act model. For a container buyer, ISO 9001 is the floor the supplier's other certifications rest on: without it, AQAP 2110 cannot be certified, and EN 1090 Factory Production Control becomes harder to audit.

ISO 14001:2015 is the environmental management equivalent. It mandates an environmental policy, identification of environmental aspects, operational planning and control, emergency preparedness, and continual improvement. The 2024 climate-action amendment tightened the standard's interaction with climate disclosure obligations. For public procurement buyers, ISO 14001 is increasingly a hard requirement, especially when the contract is European-funded or carries sustainability scoring.

Tanax holds ISO 9001 and ISO 14001 as core certifications. They are the basis for AQAP 2110, ISO 3834-2, and the EN 1090 EXC2 capability.

How to verify a supplier

A serious buyer never accepts a certification claim at face value. Each norm above has a public verification path. Use it.

For ISO 9001, ISO 14001, and ISO 3834-2, ask for the certificate, identify the certification body, and check that body's online register. Every accredited body maintains a live registry by client name and certificate number. If the certificate is genuine, it appears; if it does not, the certificate is expired, falsified, or issued by an unaccredited body.

For AQAP 2110, the certificate is issued by an accredited body and carries an expiry date. Cross-check against the issuing body's registry the same way. The NATO codification system does not maintain a public AQAP register, so the certification body's database is the source.

For the NSPA CAGE code, use the NSPA public CAGE search tool. Enter the supplier's name or CAGE code; the tool returns the registered legal name, address, and status. A CAGE that cannot be looked up is not a CAGE.

For CSC compliance, every container should carry a physical CSC plate, an ISO 6346 BIC code, and either a next-examination date (PES) or an ACEP number. The BIC code can be checked against the BIC registry at bic-code.org. If the owner prefix does not resolve, the unit has been mis-marked.

For EN 1090 EXC2, the manufacturer holds a Factory Production Control certificate issued by a Notified Body, alongside the Declaration of Performance for the components delivered. Verify the Notified Body number on the European Commission's NANDO database.

When the paperwork checks out, finish with a factory visit. The norms above can all be falsified on letterhead. What cannot be falsified is the welding line, the blast booth, the paint cure oven, the FARO arm in the QA bay, and the welders working under documented WPS at the bench.

FAQ

What is the difference between ISO 668 and ISO 1496-1? ISO 668 sets external dimensions and ratings of series 1 freight containers. ISO 1496-1 sets the structural specification and testing regime. A container can match ISO 668 dimensions without being engineered to ISO 1496-1; a fully certified freight container meets both. For intermodal transport or marine carriage, insist on both.

Is a CSC plate required for a static storage container? Legally no, because CSC governs containers used in international transport. Practically yes, because the CSC plate is the cheapest proof that the structure has been engineered, tested, and approved to a maritime standard. A static unit with a CSC plate retains resale value and can be redeployed into intermodal traffic; one without cannot.

Does EN 1090 apply to a container used as a building? Yes. The moment the container becomes a load-bearing element on a European construction site, EN 1090 and CE marking enter the picture. For accommodation, office, and command-post containers staying in place for more than a transient period, EXC2 is the working floor. Defence and emergency-services buyers increasingly write EXC2 into specifications even for transportable units.

Is AQAP 2110 the same as ISO 9001? No. AQAP 2110 contains the full text of ISO 9001 and adds NATO-specific requirements on configuration management, risk handling, government quality assurance interfaces, and contract reporting. AQAP 2110 can only be certified in conjunction with ISO 9001. ISO 9001 is the floor; AQAP 2110 is the floor plus the NATO overlay.

What is the difference between a BIC code and a CAGE code? A BIC code is the three-letter owner prefix on a container's ISO 6346 identifier, registered with the Bureau International des Containers. It identifies the container's owner. A CAGE code is the five-character identifier issued by NSPA (or DLA in the US) that identifies a company in the NATO codification system. A defence-active container manufacturer needs a CAGE code for its company; each container in its fleet carries a BIC code. The two systems run in parallel.

How do I check that a supplier's certifications are still valid? Ask for the certificate, read the certification body and certificate number off the document, open the body's online registry, and search by client name or certificate number. The registry returns expiry date and scope. If the search returns nothing, the certificate has been revoked, has expired, or is a forgery. A supplier who refuses to share certificate numbers should be treated as a supplier without valid certificates.

Which of these norms does Tanax Containers hold? Tanax holds ISO 9001 (quality), ISO 14001 (environmental), ISO 3834-2 (welding, comprehensive level), AQAP 2110:2017 (NATO quality), and NATO CAGE 4094M (NSPA registered September 2025). The container line is built to ISO 668, ISO 1496-1, ISO 6346, and ISO 1161 corner castings, with CSC plate on every freight unit. The steel structure line runs to EN 1090-1 EXC2 capability, with welders qualified under EN ISO 9606 and surface preparation to EN ISO 8501 Sa 2.5.

Can a non-NATO buyer benefit from AQAP-grade certification? Yes. AQAP 2110 is more demanding than ISO 9001 alone, with stricter configuration management, traceability, and reporting requirements. Civilian buyers in public procurement, critical infrastructure, and high-reliability industrial OEMs increasingly value AQAP-certified suppliers because the quality system passes through to civilian work. The certification does not restrict the supplier to defence customers; it raises the floor for everyone.