Sourcing from Asia — How to Secure Quality

Sourcing metal components from Asia — primarily China, but also Taiwan, Vietnam, India and Thailand — is an established part of the supply chain for many European industrial companies. Yet there remains widespread concern about quality issues, communication difficulties and unpredictable lead times.

That concern is not unfounded. But it rarely stems from Asian suppliers being structurally inferior in quality. It stems from inadequate preparation, unclear specifications and lack of follow-up on the buyer’s side.

This article gives you a structured approach to securing quality when sourcing castings, CNC-machined components or steel parts from Asia.

Why Sourcing from Asia Remains Relevant

Despite geopolitical tensions, rising freight costs and political discussion about “nearshoring”, Asian suppliers — and Chinese ones in particular — continue to be competitive in metalworking for several reasons:

Scalability and capacity: China has an industrial infrastructure without parallel. The number of foundries, CNC workshops and steel fabricators with high automation and large capacity is difficult to match in Europe.

Price level: For standardised components at high volumes, the cost savings compared to European production remain significant — typically 30–60 percent for castings and 20–40 percent for CNC parts, calculated on component price excluding freight.

Specialisation: Certain product segments — such as precision aluminium castings, complex die-cast parts and specific surface treatments — have an industrial maturity in China that does not exist to the same extent in Europe.

Taiwan and South Korea: For high-precision parts and advanced alloys, Taiwan and South Korea are well-regarded alternatives with a strong quality culture and established export relationships with Europe.

The challenges are therefore not about Asian production being structurally inferior — they are about distance, communication and how the buyer manages the relationship.

The Most Common Mistake: Starting with Price

Most quality problems when importing metal goods can be traced back to a fundamental mistake: the purchasing decision was made on price, not on the supplier’s capability.

A low quote may be because the supplier:

Has taken a shortcut in material selection (wrong alloy, lower purity)
Plans to outsource production to a sub-supplier you are not aware of
Lacks the right measuring equipment to verify your tolerances
Has not understood the specification but does not want to risk losing the business

It is not uncommon for a Chinese factory to win a quote with low prices, deliver sample parts that look good — but when series production starts, they choose cheaper raw materials or change the process without informing the customer.

The remedy is structured qualification work before you place an order.

Step 1: Choose the Right Type of Supplier

There are essentially three types of actors you encounter when sourcing in Asia:

Direct Factory: The most transparent form. You see the production environment, capacity and quality systems. Requires more work on relationship building and communication, but provides the best control.

Trading Company: Acts as an intermediary between several factories. Easier entry, but you often do not know who is actually manufacturing. Risk of losing control through subcontracting.

Sourcing Agent: A local agent in the producing country who handles supplier contacts, factory visits and on-site follow-up. Can be effective if the agent has the right technical competence.

For metal components with technical requirements, a direct relationship with the manufacturer is recommended in the first instance, alternatively through a well-proven sourcing partner with technical expertise and their own supplier relationships.

Step 2: Conduct a Supplier Audit

Before sample production begins, the supplier should be audited. This can be done in three ways:

Document audit: Request and review ISO 9001 certificates (check the issuer and validity date), customer references in your industry, capacity description (machinery, number of employees, production area) and quality plan for your component.

Video review: Conduct a structured video meeting where the supplier shows the production environment, measurement lab and relevant machinery. Ask them to demonstrate how they handle incoming material and how they document deviations.

Factory audit: The most reliable option, but requires travel or a local representative. A standardised audit template covers production capacity, equipment status, quality systems, deviation handling and capability for your specific component.

A supplier who objects to an audit, charges for showing the factory or is vague about their equipment should be excluded.

Step 3: Specify Correctly — and Verify That the Supplier Understands

A major source of quality defects is that the specification has been misinterpreted — or not interpreted at all.

When sourcing metal products: always send drawings in PDF with clear tolerance specifications, material standard (ISO, DIN, ASTM or equivalent), surface treatment and surface roughness, and testing requirements. Add a brief technical summary in English highlighting the three to five critical points.

Then require the supplier to send back a written confirmation where they specifically comment on critical dimensions and materials. If they just reply “OK, we can do this” without having read the specification, that is a warning sign.

Step 4: Structure Sample Production and FAI

Sample production is the most important check in the entire chain. Require:

First Article Inspection Report (FAIR): Documentation of every drawing dimension against the measured value, stating the measurement method. The supplier should always send this report with the sample parts.

Material Certificate: Type 3.1 or 3.2 according to EN 10204 (depending on application). Check that the stated material actually matches the specification — request spectroscopic analysis if in doubt.

Internal review: Do not receive sample parts and approve them without your own inspection. Measure critical dimensions, review surface quality, verify that the material is correct.

Approve sample production in writing and clarify that series production must be carried out with identical processes and materials as the sample run.

Step 5: Third-Party Inspection for Series Deliveries

For ongoing series deliveries from Asia — especially high volumes or safety-critical parts — third-party inspections at the factory are a cost-effective way to reduce risk.

A local Pre-Shipment Inspection checks that the delivery meets defined criteria: dimensional spot-checks, visual inspection, packaging and quantity. The cost is typically €200–400 per inspection — a fraction of the cost of claiming an entire shipment.

Inspection standards are usually based on AQL (Acceptable Quality Level). AQL 1.0 means very strict requirements, while AQL 2.5 is common for industrial components. Define this in your order.

Step 6: Handle Communication Professionally

Communication with Asian suppliers requires a conscious strategy:

Write concisely, clearly and without idioms. Avoid expressions like “roughly”, “if it suits” or “when you have the opportunity”.
Always document in writing what was decided in meetings. Send a summary email immediately after each call.
Require written confirmation of changes, not just verbal “yes”.
Never accept “we will try” as an answer to a delivery date question — require a specific date.

Promptness and clarity in communication reduces misunderstandings and gives you a basis if a dispute arises.

Red Flags to Recognise

The following signals should cause you to pause or end a supplier discussion:

The supplier changes the price significantly without explanation after you have shown interest
They cannot produce their own measurement records, or have a measurement lab but no calibration certificates
They avoid specific questions about material or process with vague answers
Communication is conducted solely via WeChat without documented decisions
They deliver sample parts without a FAIR

Traficator’s Work with Asian Suppliers

Traficator International AB has established supplier relationships in China, Taiwan and Vietnam for castings, CNC machining and steel parts. We conduct qualification, sample production and ongoing delivery follow-up for Swedish manufacturing companies that lack their own resources or network for this.

Our process follows ISO 9001 and includes technical drawing review, FAI management and, on request, coordination of third-party inspection at the factory.

We take full responsibility for the supply chain from supplier contact to delivery to your warehouse in Sweden.

Summary

Quality when sourcing from Asia is not determined by where the component is manufactured — it is determined by how the sourcing process is conducted. With proper supplier qualification, clear specification, structured sample production and active communication, Asian production of metal goods is a realistic and competitive option for Swedish manufacturers.

Would you like to discuss your situation — existing supplier relationships that are not working, or a new sourcing requirement — contact us via traficator.se/kontakt. We conduct a free initial assessment.

Relaterade artiklar

Läs mer om våra tjänster: metallgjutning, pressgjutning, sandgjutning och CNC-bearbetning.