Sourcing motor lamination stacks from China

UK duty on electric motor lamination stacks

Read from the UK Trade Tariff on 1 October 2026, heading 8503 covers parts suitable solely or principally for electric motors and generators. Steel laminations and stator or rotor cores, whether stacked or unstacked, have their own branch. The selected Chinese-origin lines carry a normal duty of 2%, with no anti-dumping or countervailing duty recorded in the supplied tariff data.

Code 8503 00 20 90 has a 0% suspension under authorised-use supervision for manufacturing rotors for offshore wind turbines used in offshore wind energy production. HMRC provides relief for eligible imports used for specific purposes. Code 8503 00 98 75 also has a 0% suspension for the precisely described stacked stator bodies; its footnote excludes mixtures, preparations and products made up of different components containing them. No import controls are recorded against the selected lines.

Confirm the commodity code using the drawing, dimensions, weight, windings and intended application. The specialist compressor-core descriptions must match in full, and a small stack does not qualify automatically for a suspension. Ask your customs broker to confirm the relief conditions before declaration. See the wider motor parts, stators and rotors guide for other products within the heading.

Specify the steel, insulation and assembled stack

Write the electrical steel grade, lamination thickness, insulation coating and stacking method into the drawing. Specify bore and outside dimensions, slot profile, stack height, burr acceptance and any skew. Agree whether the stack is interlocked, welded or bonded, and approve a sample made by the intended production process. Ask for the steel mill certificate and core-loss results tied to the material supplied.

Confirm with the relevant authority whether bare lamination stacks supplied as parts to a motor maker require UKCA marking of their own, and which UKCA or CE marking requirements apply to the finished motor or machine for the Great Britain market. Keep the component specification separate from the finished product's conformity assessment.

Worked duty example

Illustrative example, not a quote: 5,000 stacked stator cores; illustrative order, not a quotation under 8503 00 20 90, invoiced at £20,000 free on board, with £1,500 of freight and insurance to the UK. The customs value is £21,500. Duty at 2% is £430. Import VAT at 20% is charged on the customs value plus duty, £21,930, so it is £4,386. Import taxes total £4,816; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £430 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Material: match the mill certificate and batch identification to the ordered steel grade and thickness; compare sample-stack core-loss results with the agreed acceptance criteria.

Insulation and burrs: inspect coating coverage and damage, measure burr height on sampled laminations, and check interlaminar insulation against the agreed test method.

Geometry: measure stack height, bore roundness, concentricity, slot dimensions and any skew against the drawing; check fit with the mating component or agreed gauge.

Stack integrity and arrival: inspect welds, interlocks or bonding for distortion and loose sheets; check delivered stacks for rust, crushed edges and damage to slot mouths.

What goes wrong

Substituted steel raises core losses and heating. Stamping burrs can bridge the insulation between adjacent sheets. Welding or interlocking can distort the bore, while inconsistent stack height changes assembly fit. A stack that matches the outside dimensions can still fail electrically or obstruct winding insertion.

Approve both material evidence and measurements from production samples before accepting the bulk. On arrival, compare the delivered batch with that approval and investigate rust or coating damage before assembly. Agree the sampling and reporting scope through quality inspection.

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.