Sourcing crankshaft grinding machines from China

UK duty and the grinding function

Read from the UK Trade Tariff on 1 October 2026, heading 8460 covers machine tools finishing metal or cermets using grinding stones, abrasives or polishing products. Crankshaft journal grinding points towards the cylindrical-grinding categories, with the control system affecting the line selected.

The supplied tariff snapshot shows 0% duty for goods from China on every listed line, with no anti-dumping or countervailing duties, suspensions or attached import controls. The table starts with cylindrical grinders; the other-grinder rows are conditional alternatives for configurations outside that category, rather than interchangeable codes.

Give your customs broker the machine specification, grinding functions and control details to confirm the commodity code. See the cylindrical grinding machines guide for the wider product family.

Specify journal grinding and offset workholding

State the crankshaft drawings and materials, maximum workpiece length and swing, journal diameters, crank throw, workpiece mass and whether the machine must grind main journals, crankpins or both. Specify offset chuck adjustment, centres, steady rests, counterbalancing and clearance around webs and counterweights.

Agree journal diameter, roundness, taper, surface finish and fillet profile acceptance criteria. Define the wheel profile, dressing arrangement, coolant filtration, measuring equipment and test crankshaft. Ask the factory to demonstrate the agreed operations with the proposed workholding.

For supply in Great Britain, confirm with the relevant authority the applicable essential health and safety requirements under the Supply of Machinery (Safety) Regulations 2008, together with declaration of conformity, marking and English instruction requirements. CE marking remains recognised indefinitely in Great Britain alongside the UKCA route. Arrange review of the exact machine's documents through testing and certification.

Worked duty example

Illustrative example, not a quote: A numerically controlled crankshaft grinding machine, illustrative order under 8460 23 00 00, invoiced at £110,000 free on board, with £7,000 of freight and insurance to the UK. The customs value is £117,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £117,000, so it is £23,400. 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

Journal accuracy: grind the agreed crankshaft and measure main journals and crankpins for diameter, roundness, taper and surface finish. Check fillet profiles against the drawing and retain the measurement record.

Workholding: demonstrate offset setting, chuck grip, centre alignment, steady-rest adjustment and counterbalancing. Check clearance throughout the grinding cycle and look for vibration or chatter.

Safety and documents: check wheel guarding, spindle speed limits and wheel compatibility; test emergency stops and fitted guard interlocks. Match the declaration, marking and English manual to the machine supplied.

Arrival condition: inspect exposed journals and slideways for corrosion, check accessories against the packing list, and remove transport locks according to the manual. Repeat the agreed accuracy test after installation. Plan this through quality inspection.

What goes wrong

A machine may demonstrate acceptable main journals but fail on offset crankpins because the chuck adjustment, counterbalancing or steady-rest arrangement is unsuitable. Incorrect wheel dressing can spoil fillets, while vibration and poor coolant filtration leave chatter or a damaged finish.

Require the factory trial to include the difficult crankpin operation and the specified fillet profile. Record the setup and results, secure moving assemblies for transport, and repeat the trial after installation before accepting production performance.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For machinery and equipment, see machinery imports.