Sourcing roller-chain sprockets from China

Duty depends on material and the tariff description

Read from the UK Trade Tariff on 30 September 2026, heading 8483 includes separately presented chain sprockets alongside other transmission components. Cast-iron or cast-steel sprockets fall within the supplied line 8483 90 81 90. The supplied forged-sprocket line has specific dimensional and hardness conditions.

These sprocket lines carry 0% duty for goods from China, with no anti-dumping or countervailing measures, suspensions or attached import controls recorded. The table also identifies neighbouring specialist lines to avoid confusing engine timing sprockets or gear wheels with industrial roller-chain sprockets. The supplied facts do not contain a general residual line for other steel sprockets.

Confirm the commodity code using the drawing, material and manufacturing process. Do not use the specialist forged-sprocket code merely because a part is forged. For related transmission components within the wider heading, see gear racks and pinions. For belt-drive components, see our V-belt pulley sourcing guide.

Specify the chain interface and shaft fit

Give the factory the chain designation, pitch, roller diameter, internal width and number of strands. Specify tooth count, tooth profile, plate thickness, hub arrangement, finished bore, keyway and any bush interface. Include a controlled drawing rather than relying on a catalogue photograph.

State the material, manufacturing process, tooth heat treatment and agreed hardness checks. Describe the operating load, speed, lubrication and environment. Approve a sample against the actual chain and shaft before releasing production.

For workplace machinery, the law requires prevention of access to dangerous parts, or stopping their movement before someone enters the danger zone. Include the chain drive's guarding arrangement in the installation review.

Worked duty example

Illustrative example, not a quote: Illustrative order of 300 cast-iron industrial roller-chain sprockets under 8483 90 81 90, invoiced at £8,000 free on board, with £1,200 of freight and insurance to the UK. The customs value is £9,200. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £9,200, so it is £1,840. 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

Chain engagement: compare tooth count, pitch, tooth form and strand spacing with the drawing; trial the approved chain without forcing engagement.

Shaft fit: measure the bore, keyway, hub length and mounting interface; check radial and axial runout against the agreed drawing limits.

Material and treatment: match material records to the batch and check tooth hardness and treatment depth where specified.

Arrival condition: inspect teeth for burrs, chips and impact damage, check corrosion protection and separate mixed variants. Record findings through the inspection process.

What goes wrong

A sprocket can resemble the sample yet have the wrong chain profile, strand spacing or bore. Poor concentricity causes uneven chain tension; burrs interfere with engagement, while unsuitable material or heat treatment can cause rapid tooth wear.

Keep the approved drawing and sample tied to the batch. Quarantine parts with uncertain identity or fit, and agree how the factory will investigate dimensional or hardness failures before accepting replacements.

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.