Sourcing steel and iron pipe fittings from China

Zero duty

Read from the UK Trade Tariff on 25 September 2026, cast fittings of non-malleable cast iron, malleable and ductile iron fittings, flanges, threaded sleeves, elbows and bends, and butt-welding fittings of iron or steel carried 0% duty on goods from China, with no anti-dumping measure on the lines checked. For other cast products, see our cast iron covers and castings guide.

Fittings are dense, so the container weight limit sets the freight share of the landed price. Confirm the commodity code by material and fitting type.

All the lines in the table above are in the iron and steel sector of the UK carbon border adjustment mechanism (CBAM), which applies to imports from 1 January 2027. From that date, an importer who expects £50,000 or more of CBAM goods within 30 days, or has imported that much in the previous 12 months counting only imports on or after 1 January 2027, must register, keep records for 6 years, and should ask suppliers for emissions data now. See our UK CBAM guide.

Standards, threads and pressure

Fittings are specified by standard: the thread form, British Standard Pipe or another, the flange standard and pressure class, and the pressure and temperature rating. Put the standard, size range, material grade and finish, black, galvanised or coated, in the product specification, and ask for material certificates with each batch. For the pipes themselves, see our ductile iron and cast iron pipes sourcing guide.

Check threads with gauges and dimensions on samples at inspection, and ask for a pressure test on a sample from each batch for pressure-rated fittings.

Drinking water and gas

Fittings on water supplied by a water undertaker are water fittings: regulation 4 of the Water Supply (Water Fittings) Regulations 1999 requires them to be of an appropriate quality and standard, shown by a British Standard or a regulator-approved specification, and merchants often ask for third-party approval. The taps and valves guide covers the rule. For copper plumbing connections, see our copper press-fit fittings sourcing guide.

Fittings for gas, fire protection or pressure systems have their own standards and approvals; state the application so the factory supplies the right product and evidence. For food-contact applications, see our guide to stainless steel hygienic clamp fittings.

Worked duty example

Suppose, purely for illustration, you import 10 tonnes of steel flanges under 7307 91 00 90. At £18,000 free on board and £2,000 to ship and insure, the customs value is £20,000. With 0% duty on steel flanges, the only charge is import VAT: 20% of £20,000, or £4,000. VAT-registered businesses usually recover that in their next return. When checked, heading 7307 fittings were not among the lines carrying the 50% out-of-quota steel duty from 1 July 2026, and had no anti-dumping measure. The method is set out in how UK import duty and VAT work.

Inspection checklist

Product standards: malleable iron threaded fittings are specified to BS EN 10242, steel flanges to BS EN 1092-1 and butt-welding fittings to BS EN 10253. Check the markings required by the standard, face-to-face dimensions, and for flanges the pitch circle diameter, bolt hole number and size, and thickness on sampled pieces.

Galvanising: measure hot-dip coating thickness with a magnetic gauge at several points against the requirement of ISO 1461 or the order, and check that threads were cleared after galvanising and run freely with the mating gauge.

Leak tightness and approval: run the leak or pressure test required by the standard for the pressure class on a sample from each batch, and for fittings on drinking water check the exact model appears in the Water Regulations Advisory Scheme approved products directory or another approval the merchant accepts.

What goes wrong

Fittings fail on threads, porosity and material. Threads that do not match the ISO 7-1 or other specified pipe thread gauge leak or cross-thread, cast and malleable iron fittings leak through porosity under pressure, and galvanising is thin or clogs the threads. Flange faces are not flat or machined to the wrong finish, pressure ratings are copied from a catalogue without testing, and material certificates do not match the heat numbers.

Check threads with plug and ring gauges to the specified standard, pressure-test a sample from each batch, measure galvanising thickness and check threads after coating, check flange dimensions, bolt holes and face finish against the flange standard, ask for inspection certificates type 3.1 with heat numbers, and confirm water fitting approval where fittings go on drinking water.

Galvanising and corrosion

Hot-dip galvanised fittings are specified by coating thickness; check it on samples, along with thread damage from the galvanising. Oil and cap the threads for the sea voyage.

Cambridge China Bridge sources cast iron, malleable iron and steel pipe fittings for merchants, installers and projects, with standards, material certificates and approvals checked before shipment. See how our sourcing service works.