Sourcing brass threaded pipe unions from China

Duty on brass threaded pipe unions

Heading 7412 covers copper tube or pipe fittings. Brass threaded pipe unions fall within the copper-alloy line, 7412 20 00 00. Female-ended, male-ended, mixed-ended and reducing unions share this line; the table shows product variants rather than separate tariff subdivisions.

Read from the UK Trade Tariff on 30 September 2026, the duty on goods from China was 0%. The supplied tariff facts list no anti-dumping or countervailing duty, suspensions or attached import controls for this line. Import VAT is separate from customs duty.

Confirm the material and fitting function when finding your commodity code. For the wider threaded brass fittings family, see the brass threaded pipe adaptors guide.

Specify the threads and union sealing joint

Specify the brass alloy, end sizes, male or female connections, thread form, pitch, taper and engagement length. Define the union nut, tailpieces and sealing arrangement: a mating metal seat or a replaceable washer. State the working fluid, pressure, temperature and assembly method, and approve a drawing and assembled sample before production.

For drinking-water use in England and Wales, confirm with the local water company or Water Regs UK what quality, standard and suitability requirements apply to the fittings in their intended circumstances of use. Specify dezincification-resistant brass where water chemistry demands it, agree a lead limit and obtain batch material reports. Match any buyer-requested approval evidence to the exact union and seal material.

Worked duty example

Illustrative example, not a quote: Illustrative small-business order: 4,000 brass threaded pipe unions with female ends under 7412 20 00 00, invoiced at £10,920 free on board, with £2,600 of freight and insurance to the UK. The customs value is £13,520. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £13,520, so it is £2,704. 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

Material: compare batch reports with the ordered alloy and test samples for lead and dezincification resistance where specified. Check the body and tailpieces, rather than accepting a report for the nut alone.

Threads: gauge each end against the drawing and assemble samples with the intended mating fittings. Check engagement, burrs, damaged starts and whether the nut tightens without binding.

Seats and seals: inspect sealing faces for machining marks and misalignment. Check washer material and fit where used, then pressure-test assembled samples using the agreed method and check again after dismantling and reassembly.

Packing and identity: keep matched union components together, protect threads and sealing faces, and check carton descriptions against the contents. Include size and variant checks in your quality inspection.

What goes wrong

A nut can tighten while a damaged or mismatched seat still leaks. Incorrect end threads may partly engage and then bind; extra tightening can damage the fitting. Mixed tailpieces, missing washers and rough sealing faces can turn apparently complete stock into unusable assemblies.

Ordinary brass substituted for specified dezincification-resistant brass can weaken in aggressive water. Keep alloy reports linked to batches, retain the approved assembly and test complete unions before accepting the shipment. Agree replacement seals and whether components may be interchanged between batches.

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.