Sourcing dynamic balancing machines from China
Dynamic balancing machines from China carry 0% UK duty under 9031 10 00 00, with no trade remedies recorded. Confirm with the relevant authority the applicable machinery safety, electrical safety and electromagnetic compatibility evidence requirements and whether UKCA or CE marking is appropriate. Agree rotor-specific acceptance tests. Cambridge China Bridge sources dynamic balancing machines.
UK duty on dynamic balancing machines
Heading 9031 covers measuring and checking equipment not specified elsewhere in its chapter. Dynamic balancing machines fall within the line for machines for balancing mechanical parts. The table shows machine configurations sharing that tariff line, rather than separate commodity codes. See the wider measuring and inspection guide for other equipment. For leak testing equipment, see our pressure decay leak tester sourcing guide.
Read from the UK Trade Tariff on 16 October 2026, code 9031 10 00 00 carried 0% duty for goods from China. The supplied record lists no anti-dumping or countervailing measures, suspensions or attached import controls for this line. These tariff findings do not replace product safety checks.
Confirm the commodity code using the machine's function and technical description. Separately shipped parts need their own classification review. The duty and VAT guide explains import calculations; zero duty does not remove import VAT.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Horizontal dynamic balancing machines | 9031 10 00 00 | 0% | None |
Specify the rotor and balancing performance
Send drawings and representative rotors. Specify rotor mass, diameter, length, journal dimensions, correction planes, balancing speed and the residual unbalance you will accept. Choose the machine layout around how the rotor is supported and loaded. State whether the machine only measures unbalance or also performs correction.
List mandrels, adaptors, support rollers, drive belts, trial weights and software licences in the order. Agree proving rotor tests to ISO 21940-21 against the contracted performance, then repeat acceptance tests with your own parts after installation. Define the report format, software access and spare sensor availability. If sourcing encoder spares, see our optical rotary encoder guide.
For powered machines, confirm with the relevant authority the applicable machinery, electrical safety and electromagnetic compatibility evidence requirements and whether UKCA or CE marking is appropriate. Ask for the exact model's declaration of conformity and an English operating and maintenance manual. The responsible person must ensure that the technical file is compiled and available on request.
Worked duty example
Illustrative example, not a quote: A workshop dynamic balancing machine with rotor fixtures, purely illustrative under 9031 10 00 00, invoiced at £10,000 free on board, with £900 of freight and insurance to the UK. The customs value is £10,900. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £10,900, so it is £2,180. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.
Inspection checklist
Performance: witness proving rotor tests and repeat measurements after removing and remounting your sample rotor. Compare residual unbalance and angular indication with the agreed acceptance criteria.
Fixtures: check journal fit, mandrel runout, support adjustment, drive engagement and clearance through the correction cycle. Confirm that the supplied fixtures match your rotor drawings.
Safety and documents: check guards, interlocks and emergency stops against the agreed design. Match the machine identity to its conformity declaration, marking, manual and calibration records.
Arrival: inspect transport restraints, supports, sensors and cables before installation. Repeat the agreed tests on the installed machine before acceptance. Use the inspection guide to document results.
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What goes wrong
A demonstration rotor can give convincing readings while your production rotor slips on its mandrel or sits incorrectly on the supports. Fixture runout, inconsistent mounting and the wrong correction-plane settings can make readings change between runs. Test representative parts and retain the settings and raw results.
Shipping damage, unsuitable foundations and vibration from nearby equipment can undermine factory results. Software may report correction positions in a format your operators cannot use. Agree installation conditions, report outputs and a repeatable acceptance method before shipment. For vibration measurement equipment, see our machinery vibration analyser guide.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.
Frequently asked questions
What is the UK import duty on dynamic balancing machines from China?
The supplied tariff record shows 0% duty under 9031 10 00 00, with no anti-dumping or countervailing measures recorded.
Do dynamic balancing machines need UKCA or CE marking?
Check the declaration against the exact model.
How should I test a balancing machine before shipment?
Agree proving rotor tests to ISO 21940-21 and tests using your production rotors. Record repeatability after remounting, residual unbalance and correction positions.
Can I accept the factory calibration after delivery?
Use it as a baseline, then repeat the agreed acceptance tests after installation. Check fixtures, supports and the installation environment before accepting the machine.