Sourcing ferrite suppression beads from China

0% duty, subject to classification

Read from the UK Trade Tariff on 11 October 2026, heading 8548 covers electrical parts of machinery or apparatus not specified elsewhere in the chapter. The supplied tariff has no named ferrite bead line. Its residual code, 8548 00 90 99, is a candidate only after classification checks. The table shows bead formats against that same candidate code, rather than separate tariff subdivisions.

All supplied lines carry 0% duty for goods from China, with no anti-dumping or countervailing measures or suspensions recorded. The residual line carries import and export waste controls. Confirm their application to the actual China shipment with your customs broker, particularly for reclaimed material. For imports into England under waste notification controls, the exporter in China must apply to the competent authority in the country of dispatch for consent.

Give your broker the drawing, material description, construction and intended use. Check for a more specific heading before using the residual code through finding your commodity code. For related cable-mounted products, see clamp-on ferrite suppression cores.

Specify the ferrite material and impedance curve

This guide focuses on unwound beads fitted over a conductor. State the ferrite material grade, impedance curve across the intended noise frequencies, measurement fixture and acceptance tolerances. Specify bore shape and dimensions, outside dimensions, coating, operating temperature range and the conductor arrangement used for approval. Agree whether the drawing permits any material substitution.

Request restricted-substance declarations and material data matched to the bead and any coating, supporting the finished equipment's compliance. Manufacturers of equipment within the hazardous-substance rules must produce and maintain technical documentation demonstrating compliance. Keep the approved sample, drawing revision and supplier material records together.

Worked duty example

Illustrative example, not a quote: 5,000 unwound ferrite suppression beads, assuming this classification; illustrative only under 8548 00 90 99, invoiced at £1,200 free on board, with £600 of freight and insurance to the UK. The customs value is £1,800. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £1,800, so it is £360. 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

Identity: match carton labels, supplier part numbers, material grade and batch records to the purchase order and approved sample.

Dimensions: gauge the bore and outside dimensions, trial-fit the intended conductor, and inspect bore edges, cracks, chips and coating coverage.

Performance: compare sampled impedance curves with the approved limits using the agreed fixture and conductor arrangement; investigate batch differences.

Packing: check that beads cannot collide in transit, inspect for ferrite dust and broken edges, and keep different grades and batches separated. Plan checks with our quality inspection guide.

What goes wrong

Beads can look identical while using different ferrite materials. A substituted grade may miss the troublesome frequency range, and an impedance result taken with a different fixture may give a misleading comparison. Approve the curve and measurement method together, then compare production samples using that method.

A tight bore can damage conductor insulation during assembly; chipped edges and cracks can escape a simple count check. Trial-fit production samples and inspect after transport. Avoid approving a replacement solely because its dimensions match.

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.