Sourcing precision gauge blocks from China

UK duty on precision gauge blocks

Heading 9017 covers drawing and calculating instruments and hand instruments for measuring length. Its micrometers, callipers and gauges line is 9017 30 00 00. This is the candidate line for precision gauge blocks; confirm the actual product and set contents before declaring it. The table distinguishes product variants sharing that line.

Read from the UK Trade Tariff on 30 September 2026, the supplied gauges line carries 2% duty on goods from China. The supplied record lists no anti-dumping or countervailing duty, suspensions or attached import controls for that line. The wider heading ranges from 0% to 2%; its plotter rate should not be used for gauge blocks.

The import declaration must include the commodity code. Confirm it using the material, function and complete contents of the shipment, with our commodity code guide. For related measuring instruments within the wider heading, see sourcing micrometers.

Specify lengths, material and calibration

Send a complete nominal-length list and state whether you need individual replacement blocks or matched sets. Specify steel, ceramic or carbide, the intended workshop or reference use, dimensional tolerances, measuring-face flatness and parallelism, and acceptable wringing performance. Agree these as purchasing criteria rather than relying on an unspecified accuracy grade.

Request calibration results identifying each block, its measured deviation, measurement uncertainty and reference conditions. Agree the laboratory and the evidence needed to connect its measurements to recognised references. Include protective treatment, cleaning instructions, identification placement and a fitted case in the purchase specification.

Worked duty example

Illustrative example, not a quote: Illustrative batch of steel gauge block sets for a workshop supplier under 9017 30 00 00, invoiced at £3,000 free on board, with £860 of freight and insurance to the UK. The customs value is £3,860. Duty at 2% is £77.20. Import VAT at 20% is charged on the customs value plus duty, £3,937.20, so it is £787.44. Import taxes total £864.64; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £77.20 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match nominal lengths and block identifiers to the order, case positions and calibration records; check for missing or duplicated blocks.

Measuring faces: inspect cleaned faces for rust, scratches, chips and raised burrs; keep damaged blocks out of the accepted set.

Calibration: have the agreed laboratory check selected blocks against the purchasing tolerances, considering the reported uncertainty and reference conditions.

Wringing and packing: check that prepared faces wring consistently using the agreed method, and that case inserts prevent movement during transport.

What goes wrong

A set can arrive complete yet be unsuitable for inspection because its certificate describes only the set, without identifiable results for the blocks. A grade engraved on the case does not show the measured deviation of a particular block. Agree the certificate format before approving the sample.

Corrosion, chipped edges and burrs can spoil contact between measuring faces. Mixing nominal lengths or replacing a missing block without matching its record breaks the set's traceability. Quarantine questionable blocks on arrival and agree replacement and recalibration arrangements with the supplier.

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.