Sourcing trimmer potentiometers from China
Trimmer potentiometers from China carry 0% UK duty across the relevant lines of heading 8533, with no listed anti-dumping duty. Business-to-business components are outside the hazardous-substances rules themselves; confirm with the relevant authority how those rules apply to finished equipment incorporating them. Cambridge China Bridge sources trimmer potentiometers.
0% duty on trimmer potentiometers
Read from the UK Trade Tariff on 30 September 2026, heading 8533 covers electrical resistors, including potentiometers, but excludes heating resistors. Non-wirewound trimmers with power handling not exceeding 20 W fall under 8533 40 10 00; wirewound equivalents fall under 8533 31 00 00. The higher-power and parts rows apply only where the actual goods match those descriptions.
The supplied tariff record shows 0% duty for goods from China on every line, with no listed anti-dumping or countervailing duty, suspensions or attached import controls. Import VAT is separate from customs duty; see UK import duty and VAT.
Confirm construction, power handling and whether the shipment contains complete components or parts against the datasheet before choosing the commodity code. For the wider heading, see wirewound rheostats.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Non-wirewound trimmer potentiometers, power handling not exceeding 20 W | 8533 40 10 00 | 0% | None |
| Wirewound trimmer potentiometers, power handling not exceeding 20 W | 8533 31 00 00 | 0% | None |
| Non-wirewound variable resistors, including trimmers, above 20 W | 8533 40 90 00 | 0% | None |
| Parts of resistors and potentiometers | 8533 90 00 00 | 0% | None |
Specify the adjustment mechanism and board fit
Specify resistance value, tolerance, resistive technology, power rating, working voltage and temperature coefficient. State whether adjustment is single-turn or multiturn, whether the screw is reached from above or the side, and the required resistance change with adjustment. Match the body dimensions, terminal layout and mounting style to your board drawing.
Agree adjustment torque, usable travel, end-stop behaviour, setting stability and the intended soldering and cleaning process. Test approved samples in the actual circuit and enclosure, including access for the adjustment tool.
Official Great Britain guidance says components sold business-to-business are outside the hazardous-substances regulations themselves. Confirm with the relevant authority how those regulations apply to finished electrical equipment incorporating the components. Ask for part-specific restricted-substance declarations and material data covering the resistive element, terminals, plating and housing.
Worked duty example
Illustrative example, not a quote: 5,000 non-wirewound trimmer potentiometers for circuit-board assembly, illustrative order under 8533 40 10 00, invoiced at £9,000 free on board, with £300 of freight and insurance to the UK. The customs value is £9,300. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £9,300, so it is £1,860. 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
Electrical behaviour: measure total resistance against the ordered tolerance, then adjust the wiper through its travel and check for jumps, intermittent contact and unstable readings.
Board fit: compare body dimensions, terminal spacing, wiper connection and adjustment direction with the approved drawing; trial-fit samples before releasing the lot.
Adjustment and assembly: check screw engagement, torque and end-stop behaviour against the sample, then verify setting stability after the agreed soldering and cleaning process.
Traceability: match manufacturer, full part number, batch labels and material declarations to the order. Check packing protects terminals and adjustment screws. Use the quality inspection guide to prepare the inspection brief.
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What goes wrong
A matching resistance marking can conceal a different pin layout, adjustment direction or resistive technology. The component may fit the board but leave its screw inaccessible inside the enclosure. Wiper contact problems cause readings to jump, while a setting that shifts after assembly defeats calibration.
Approve the complete part number and drawing rather than accepting a replacement on resistance value alone. Keep a reference sample and require approval before changes to the mechanism, materials or terminals. Material paperwork should identify the ordered component, rather than describe the factory's whole range.
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 trimmer potentiometers from China?
The supplied tariff record shows 0% across the relevant lines of heading 8533, with no listed anti-dumping or countervailing duty. Import VAT is separate.
Which commodity code covers trimmer potentiometers?
Non-wirewound trimmers not exceeding 20 W fall under 8533 40 10 00; wirewound equivalents fall under 8533 31 00 00. Confirm construction and power handling from the datasheet.
Do trimmer potentiometers need restricted-substance paperwork?
Business-to-business components are outside these regulations themselves. Ask for part-specific declarations and material data, and confirm with the relevant authority which hazardous-substances requirements apply to finished equipment incorporating them.
How do I check a replacement trimmer before ordering?
Compare resistance, tolerance, ratings, terminal layout, body dimensions and adjustment access. Trial-fit and solder samples, then check smooth adjustment and setting stability in your circuit.