Motor Vehicle Parts: A Broad, Distributed Supplier Network

Executive summary

The motor vehicle parts category covers a wide range of products and vehicle programs. The underlying trade data records approximately $451.9 billion in exports, with a Herfindahl–Hirschman Index (HHI) of 680. Germany accounts for 14.2%, China 12.1%, Mexico 9.4%, the United States 9.3%, and Japan 6.0%.

This is not a single, uniform supply chain. Component makers commonly serve multiple vehicle segments and sell through OEM and Tier 1 relationships. BorgWarner, for example, reports revenue across light vehicles, commercial vehicles, off-highway applications, and the aftermarket. Its products are generally shipped directly from its factories to automakers.

The category should also be read carefully: customs classifications do not consistently identify the physical end use of generic products. Bearings, valves, gaskets, and fasteners may be used in cars while remaining classified under their own product headings. The network therefore removes unsupported direct links from those generic categories to motor vehicle parts. Physical use alone is not evidence of a customs-category supply relationship.

1. Scope and interpretation

“Motor vehicle parts” is a broad category spanning many components and vehicle types. In the detailed product breakdown, the representative “other parts” group accounts for about 22%. This breadth makes aggregate trade totals useful for understanding the scale of cross-border activity, but less useful for identifying a particular component’s supplier chain.

The network retains a link from parts to passenger vehicles because BorgWarner’s disclosures document substantial light-vehicle business. It does not infer that every product in the broad parts category is used in passenger cars.

2. Upstream materials and components

Aluminum

Novelis has announced an integrated aluminum rolling and recycling facility in Bay Minette, Alabama, with planned annual capacity of 600,000 metric tons. Novelis also produces automotive aluminum at facilities including Oswego, New York; Guthrie, Kentucky; and Kingston, Ontario. These disclosures establish relevant regional material capacity, but do not identify a specific shipment from those plants to a particular motor vehicle parts manufacturer.

Bearings and metal inputs

RBC Bearings describes sourcing steel and cast-iron inputs from suppliers in the United States, Europe, and Asia. This is evidence about its material sourcing. It does not establish that a particular bearing product is supplied to the motor vehicle parts category or to a specific automaker.

3. Component makers and customer relationships

BorgWarner’s 2025 revenue mix was 82% light vehicles, 10% commercial vehicles, 5% off-highway, and 3% aftermarket. The company operates facilities in Europe, the Americas, and Asia. Its filings say products are generally shipped directly from factories to OEM customers. This supports the presence of direct manufacturer relationships, while the revenue mix shows that the business is not limited to passenger cars.

Aptiv supplies electrical distribution systems and reports serving the world’s 25 largest automakers. It operates 11 technical centers and describes local manufacturing as a way to stay close to customers. This illustrates why the supplier network is geographically distributed and organized around OEM programs.

Magna is another major Tier 1 supplier with manufacturing spread across regions. Its disclosures support a model in which suppliers operate near customer production and deliver components into vehicle programs. They do not imply that every Magna facility supplies every automaker or every vehicle platform.

4. Quality and vehicle regulations

Automotive quality management

IATF 16949 is a quality-management standard for the automotive supply chain. Requirements can flow from vehicle manufacturers through Tier 1 suppliers to sub-tier suppliers. Certification or compliance supports supplier qualification, but by itself does not prove a commercial relationship with a particular customer.

United States

Federal Motor Vehicle Safety Standards (FMVSS) apply to vehicles and equipment items within their scope. The requirements relevant to a component depend on the product and its role; FMVSS should not be treated as one blanket certification that applies identically to every part.

European Union

EU vehicle type approval covers applicable safety, environmental, and production-conformity requirements. The applicable approvals depend on the vehicle or system and the relevant regulatory framework.

5. End-of-life vehicle requirements

The EU’s new End-of-Life Vehicles Regulation is scheduled to enter into force on 13 August 2026 and apply from 1 September 2028. Until the new regulation applies, the existing directive remains the relevant framework. The regulation includes requirements affecting vehicle design, materials, and end-of-life treatment.

UK guidance sets targets of 95% recovery and 85% recycling by vehicle weight. It also requires identification of certain plastic and rubber components weighing more than 200 grams, with tires excluded from that labeling rule. These requirements create design, documentation, and recovery considerations for parts suppliers.

6. Operating model and bottlenecks

The industry depends on coordinated production across material suppliers, component makers, Tier 1 integrators, and vehicle manufacturers. Regional plants can reduce transport distance and support customer programs, but they also create coordination requirements across locations, product specifications, and qualification processes.

Potential bottlenecks include access to qualified materials, production capacity for specialized components, supplier qualification, and the timing of customer vehicle programs. The available evidence does not support assigning a single bottleneck to the entire category: constraints vary by component, technology, and vehicle program.

Opportunities include regionalizing production near automaker plants, improving material recovery and recycled content, and developing components that satisfy changing safety, emissions, and end-of-life requirements. These are sector-level possibilities, not claims about a specific supplier contract.

7. Network interpretation and limitations

Sources