Sourcing sinker EDM machines from China

Duty on sinker EDM machines

Read from the UK Trade Tariff on 25 October 2026, heading 8456 covers machine tools that remove material through processes including electrodischarge. This guide concerns sinker EDM machines, which use shaped electrodes to produce cavities. Numerically controlled machines other than wire-cut machines fall under 8456 30 19 00; other electrodischarge machines fall under 8456 30 90 00.

Both relevant lines carry 2% duty on goods from China. The supplied tariff record lists no anti-dumping or countervailing measure, suspension or attached import control for either line. The table shows machine configurations sharing these tariff lines, rather than separate codes for each configuration.

Confirm the commodity code using the machine's process and control specification. For the related wire-cut category within this heading, see wire EDM machines.

Specify the cavity, electrode and dielectric system

Specify the workpiece material, cavity geometry, depth, dimensional tolerance and required surface finish. Agree electrode material, electrode holding, axis travel, table load and the usable tank space. Ask whether orbiting, electrode changing and the quoted machining functions are included in the supplied configuration.

Name the generator and controller, and agree an English interface, software access, electrical supply, filtration, cooling and flushing arrangements. Ask the factory to machine your trial cavity with the proposed electrode and dielectric. Record machining time, electrode wear, cavity dimensions and finish rather than accepting a display reading as proof.

For supply in Great Britain, confirm the applicable UKCA or CE marking, declaration of conformity and English instruction requirements with the relevant authority. The responsible person must ensure the technical file is compiled and available on request. Agree installation, operator training and access to generator parts, filters and seals before ordering.

Worked duty example

Illustrative example, not a quote: A sinker EDM machine for a small toolroom, illustrative only under 8456 30 19 00, invoiced at £28,000 free on board, with £4,000 of freight and insurance to the UK. The customs value is £32,000. Duty at 2% is £640. Import VAT at 20% is charged on the customs value plus duty, £32,640, so it is £6,528. Import taxes total £7,168; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £640 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Trial cavity: witness machining on the actual machine before shipment, then measure cavity depth, dimensions and finish against the agreed drawing.

Electrode and axes: check holder alignment, positioning repeatability, electrode wear and any supplied orbiting or electrode-changing functions.

Dielectric and safety: check tank leaks, flushing, filtration, cooling, guards, emergency stops and the operation of fitted fluid-level and temperature protection.

Documents and arrival: match the nameplate and declaration to the delivered machine. Check English instructions, accessories, transit damage, corrosion and loose connections before commissioning. Use a written inspection brief.

What goes wrong

A demonstration on an easy, shallow cavity can hide poor flushing or unstable discharge in the buyer's deeper cavity. Excessive electrode wear, tapered walls and inconsistent finish can make an apparently successful trial unusable. Agree the workpiece, electrode preparation and measurement method before the factory starts.

Orders also fail when electrode holders or dielectric equipment are omitted, the controller differs from the quotation, or service access depends on the supplier's account. Record the supplied configuration and repeat the agreed acceptance trial after installation.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For machinery and equipment, see machinery imports.