Sourcing suspension U-bolts from China

Duty and classification for suspension U-bolts

Read from the UK Trade Tariff on 30 September 2026, heading 7318 covers iron or steel fasteners. Suspension U-bolts should be checked against the headless-bolt branches, distinguishing stainless steel from other steel and the declared tensile strength. The table also includes separately imported matching nuts; these are not U-bolts. For security fasteners, see our security shear bolt sourcing guide.

The supplied tariff data shows 0% duty for goods from China on every listed line, with no anti-dumping or countervailing duty, steel measure, suspension or attached import control recorded. This tariff position does not establish that a suspension part is suitable or safe for a particular vehicle.

Give your customs broker the drawing, material specification, tensile-strength evidence and packing details to confirm the commodity code. For related suspension components, see suspension control arms.

Specify the axle fit and clamping assembly

Specify the vehicle application, axle profile, round or square bend, inside width, bend radius, leg length, rod diameter, thread pitch and usable thread length. State whether dimensions are measured before or after coating. Include the spring plate and nut arrangement in the drawing so the factory can trial-fit the complete assembly.

Agree the steel grade, finished-part mechanical properties, heat treatment, coating and batch identification. Ask for test evidence tied to the finished bent bolts, rather than only the incoming steel. Agree tightening instructions with the vehicle application engineer, including the thread lubrication condition.

For consumer vehicle parts, importers are responsible for safety and applicable labelling requirements. The vehicle aftermarket safety code places its specified responsibilities on an independent importer where imported parts have a potential safety defect.

Worked duty example

Illustrative example, not a quote: Illustrative batch of heavy-vehicle suspension U-bolts under 7318 15 48 90, invoiced at £4,000 free on board, with £800 of freight and insurance to the UK. The customs value is £4,800. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £4,800, so it is £960. 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

Geometry: measure inside width, leg spacing, bend profile and thread length against the approved drawing; trial-fit the intended axle and spring plate.

Threads and nuts: gauge the finished threads and check the supplied nuts run correctly without binding or excessive play.

Material and bends: match batch identification to mechanical-test records; inspect bend surfaces and thread transitions for cracks, laps and damage.

Coating and packing: check coating coverage and agreed thickness, protect exposed threads, and keep different vehicle applications clearly separated.

What goes wrong

A bolt can match the catalogue photograph but have the wrong inside width or bend profile, leaving uneven contact around the axle. Short threads, unequal legs and mismatched nuts can prevent the assembly from seating correctly. Coating build-up can also make a previously acceptable thread bind.

A raw-material certificate does not show how the finished bend or heat treatment performed. Hold suspect batches for investigation and keep application and batch records together. Under the vehicle aftermarket code, a producer or distributor must inform the competent authority without delay about safety issues with its aftermarket parts.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.