Sourcing motor stator housings from China

Normally 2%, with relief for qualifying housings

Read from the UK Trade Tariff on 1 October 2026, heading 8503 covers parts used solely or principally with motors and generators. The specific stator housing line, 8503 00 98 73, describes pressure die-cast aluminium housings with a specified alloy, shot-blasted and machined finish, dimensions and weight. A bare housing is different from a wound stator or stacked stator core. For the wider heading, see the motor end shields guide.

The selected lines carry 2% duty from China. The supplied record lists no anti-dumping or countervailing measures. It lists no suspension for 8503 00 98 73 or 8503 00 98 63. Under 8503 00 98 99, only qualifying listed steel housings receive 0% suspension relief. The authorised-use suspensions on 8503 00 91 99 and 8503 00 98 99 concern manufacturing rotors for offshore wind turbines, rather than ordinary stator housing orders.

The tariff attaches a supplementary-unit import control to 8503 00 98 99; ask your customs broker to confirm the declaration requirement. Supply the drawing, material specification, finish, dimensions, weight and intended motor application when confirming the commodity code. Match every condition before claiming a suspension. Use the import duty and VAT guide to calculate the order's import taxes.

Specify the stator bore and casting interfaces

Specify the alloy, casting process, machining datums, stator bore fit, bore roundness, end-shield register concentricity, mounting faces and threaded holes. Agree whether dimensions apply before or after coating. Identify cooling passages, sealing faces and any bearing sleeves. Approve a machined sample with the mating stator and end shields before releasing tooling for production.

For bare mechanical housings supplied to a motor maker, confirm with the relevant product-safety authority whether the housing or finished motor or machine needs UKCA or CE marking for the Great Britain market. Official waste electrical equipment guidance also states that components supplied to a business to build a finished product are not electrical and electronic equipment products.

Worked duty example

Illustrative example, not a quote: Illustrative order: 5,000 die-cast electric motor stator housings; values are illustrative, not a quote under 8503 00 98 73, 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 alloy certificate to the casting batch and approved drawing; check that any sleeves and inserts match the specification.

Geometry: measure the stator bore, roundness, end-shield registers, mounting-face alignment and hole positions against the agreed datums; trial-fit the mating parts.

Casting integrity: inspect for cracks, porosity and thin walls; agree sectioning or radiographic checks around critical machined areas, and leak-test cooling passages where present.

Finish and arrival: check deburring, thread cleanliness, coating coverage and protected machined surfaces; inspect for transit dents and corrosion. Agree the sampling and records through the inspection guide.

What goes wrong

A housing can look acceptable while its bore is oval or its end-shield registers are misaligned. The stator may then fit unevenly, or the assembled motor may lose its intended clearance. Coating inside a fitted bore changes the fit, and machining can expose casting porosity at sealing faces or around inserts.

Use inspection records from production housings, rather than relying only on the approved sample. Compare the drawing revision, casting batch and measured results on arrival. Keep suspect housings separate until the mating-part fit and any cooling-channel leakage have been checked.

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.