Sourcing engine connecting rods from China

Connecting-rod codes and UK duty

Read from the UK Trade Tariff on 4 October 2026, heading 8409 covers parts suitable solely or principally for the specified piston engines. Connecting rods join pistons to the crankshaft. The selected petrol and diesel lines carry 2% duty from China; the selected aircraft line carries 0%. No anti-dumping or countervailing duties or attached import controls are recorded for these lines.

Code 8409 91 00 83 describes a particular passenger-car rod for engine manufacture, with specified alloy composition, bolts, bushing, length and surface finish. Other petrol rods may fall under 8409 91 00 90 and diesel rods under 8409 99 00 90. These residual lines list suspensions for narrowly described other products; the supplied descriptions do not establish relief for connecting rods.

Confirm the commodity code against the engine application, drawing and intended use before ordering. Keep aircraft applications separate from automotive orders. See the engine parts guide for the wider heading.

Rod geometry, material and engine fit

Specify the engine identifier and original part number, centre distance, big-end and small-end bore dimensions, widths, bearing arrangement and oil passages. State the alloy, manufacturing route, heat treatment, surface finish and permitted weight variation. Define whether bushes, caps and bolts are included, and obtain the bolt tightening procedure.

Approve a measured first article and a trial assembly before releasing the production batch. For fracture-split rods, agree how each cap stays paired with its rod. Ask for material and heat-treatment records linked to the production lot.

For car and small-van rods, check the heavy-metal restrictions covering cadmium, lead, mercury and hexavalent chromium, including applicable exemptions. Replacement parts for vehicles placed on the UK market before 1 July 2003 are excluded from this requirement. Request evidence for the alloy, bushing and any coating.

Worked duty example

Illustrative example, not a quote: Illustrative batch of replacement petrol-engine connecting rods for an engine rebuilder under 8409 91 00 90, invoiced at £3,000 free on board, with £400 of freight and insurance to the UK. The customs value is £3,400. Duty at 2% is £68. Import VAT at 20% is charged on the customs value plus duty, £3,468, so it is £693.60. Import taxes total £761.60; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £68 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Geometry: measure bore size, roundness, centre distance, widths, bend and twist against the approved drawing, with the cap assembled using the agreed tightening procedure.

Material: match certificates and hardness results to the rod batch; review heat treatment and the agreed crack-detection results.

Assembly: check cap pairing, bolt identity, bush retention, bearing location and clear oil passages; compare sample weights within each engine set.

Arrival: inspect for rust, impact damage and mixed part numbers; retain batch labels and repeat critical measurements before installation. Agree the scope through quality inspection.

What goes wrong

A rod can resemble the sample but have the wrong centre distance, bore width or bearing location. Mixed caps, substituted bolts, distorted bores and incorrect heat treatment can cause bearing damage or rod failure. Quarantine suspect stock and compare measurements and batch records with the approved first article.

For rods sold as consumer replacement products, the importer is responsible for ensuring they are safe to use. Keep application claims specific and retain the evidence supporting fit and material quality. A part-number match alone does not establish that the delivered rod is suitable.

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