Knocked-down (KD) packing (KD 拆包装)

Chinese:knocked-down (KD) packingAlso known as:CKD / SKD / knocked-down kits / knocked-down export

Knocked-down (KD) packing is the practice of disassembling a complete machine or plant into completely knocked-down (CKD) or semi knocked-down (SKD) kits, packing them in separate cases for export and reassembling them at destination – typically to reduce shipping volume, meet local assembly requirements or qualify for local tariff treatment.

Key points

  • CKD (completely knocked down) and SKD (semi knocked down) are the common forms of disassembly for complete machine exports.
  • KD packing requires a disassembly list and packing plan per model, mapped to case numbers so that goods can be checked and assembled at destination.
  • Packing lists, invoices and customs declarations must stay consistent and traceable between the complete-machine view and the parts view.

In practice

Exporters of construction machinery, agricultural machinery, commercial vehicles and complete plant often ship in KD form. The difficulty is converting between levels of detail: sales contracts are per unit, production completes whole machines, KD packing works by component and case number, and customs may be declared as complete machines or as parts. Without unified data, it is hard at destination to work out which parts of which machine are in which case.

A better approach is to keep three levels – machine, container and case – together in the shipment dataset, and to issue documents per shipment, per container or per unit as each project requires. KD packing plans and results are written back, so exceptions such as missing parts or wrong cases can be traced to a specific machine and case number.

How Tranexio supports it

Tranexio’s machinery and equipment export solution builds KD packing into delivery execution, linked to machine configuration, shipment data and packing lists, and enabled per project. See Logistics and documents.

Frequently asked questions

What is the difference between CKD and SKD?

CKD (completely knocked down) means shipping the product as individual components, requiring fairly complete assembly capability at destination. SKD (semi knocked down) keeps the main assemblies intact and dismantles only some parts, so less assembly work is needed on arrival. The choice usually depends on the destination country's tariffs, localisation policy and assembly capability.

How are machines exported in knocked-down form classified?

Under General Interpretative Rule 2(a) of the Harmonized System, a complete or finished article presented unassembled or disassembled is generally classified as the complete article. Countries may, however, have their own rules and duty rates for parts and kits, so confirm the destination country's classification and tariff treatment before export.

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Updated 2026-10-06