【Getting Started with Automotive Parts Procurement in Thailand】Supplier Selection Criteria That Cannot Be Determined by Price Alone

When procuring automotive parts in Thailand, comparing only prices and shipping costs may not be sufficient for long term management. It is also necessary to consider the scope of work covered, from plastic molding and wire harness assembly to quality inspection systems and coordination. This article summarizes the key factors and supplier evaluation criteria for maintaining production stability.

Table of Contents

• Scope of automotive parts procurement evaluation in Thailand beyond price
• Automotive parts quality inspection systems and 3D measuring machines
• Integrating plastic molding, wire processing, and parts assembly in one location
• Technical support from the Japanese team for jig development
• Key checklist items for evaluating and selecting parts manufacturers
• What Matsuda Denki (Thailand) Co., Ltd. can provide
• Frequently Asked Questions
• Keywords for understanding this article

■　Scope of Automotive Parts Procurement Evaluation in Thailand Beyond Price

When procuring parts for the automotive industry in Thailand, purchasing teams often begin by comparing quotations and transportation costs alone. However, evaluating only direct costs may lead to long term management issues. If a manufacturer is responsible for only one production stage, transferring the work to another manufacturer for further assembly may result in errors between production processes. Therefore, the scope of evaluation should also cover the supplier’s ability to handle production processes, manage tooling and assembly equipment, and support changes in production specifications for plastic molding and wire processing.

■　Automotive Parts Quality Inspection Systems and 3D Measuring Machines

Quality in mass production needs to be verified using inspection equipment suited to the characteristics of each part. For resin parts and automotive switches, image measuring instruments and 3D Coordinate Measuring Machines help ensure accurate X, Y, and Z dimensional coordinates. At the same time, in wire processing, cross-section inspection equipment and electrical conductivity testing equipment are necessary to verify the integrity of wire terminal crimping and help prevent issues such as wires coming loose or electrical leakage during actual use.

■　Integrating Plastic Molding, Wire Processing, and Parts Assembly in One Location

Procuring resin parts and wire harnesses separately from multiple manufacturers and assembling them internally creates an additional burden in supplier management and increases parts storage costs. Switching to a manufacturer that can handle the entire process—from plastic molding and wire processing through to the assembly of complete switch units—reduces the number of handoffs between factories. In addition, a manufacturer capable of producing assembly aids, or jigs, in-house can respond more quickly to production line changes and help reduce overall costs.

■　Technical Support from the Japanese Team for Jig Development

Projects involving parts production that extend beyond Thailand often require close technical support from headquarters in Japan. Coordination between sales teams and engineers in both countries through weekly meetings helps facilitate jig design and mold modifications. In addition, developing molds in-house with support from experienced personnel from Japan helps reduce mold transportation time and makes it more convenient to modify and improve parts within the factory

efficiently.

■　Key Checklist Items for Evaluating and Selecting Parts Manufacturers

When inspecting and evaluating manufacturers, purchasing teams should review the scope of production processes they can support, such as plastic molding, switch assembly, and potting for protection against water and dust. Inspection equipment, including 3D measuring machines, mold storage structures, and systems for handling quality issues should also be assessed. The readiness of mass-production machinery and the engineering team is another important factor in the selection process.

■　What Matsuda Denki (Thailand) Co., Ltd. Can Provide

Matsuda Denki (Thailand) Co., Ltd. focuses on providing integrated manufacturing services for automotive parts, switches, and wire harnesses. Its factory is located in Amata City Rayong Industrial Estate and supports processes ranging from resin molding and wire processing to complete parts assembly, jig production, and in-house mold maintenance. The company supports procurement requirements with quality inspection systems based on the international ISO 9001 and ISO 14001 standards. Key criteria to consider include the scope of supported production processes, quality measurement systems, and the technical support structure.

※For more details, please download the PDF attached to this article or contact us via the form below.

■　Frequently Asked Questions

Q1：What types of measuring equipment does the factory have for automotive parts quality assurance?
A1：The factory has image measuring instruments, 3D measuring machines, and wire crimp inspection equipment for checking dimensions and the accuracy of parts assembly comprehensively.

Q2：Can the manufacturer handle complete switch assembly together with wire harnesses?
A2：The manufacturer can handle the entire process in a single factory, from plastic molding and wire processing to the assembly of finished switch units.

Q3：What support system is available if mold designs or assembly equipment need to be modified?
A3：Engineers in Thailand and Japan coordinate regularly, with specialist teams for molds and assembly equipment available to support modifications promptly.

■　Keywords for Understanding This Article

• Wire Harness : An automotive component used to transmit electrical signals and power, consisting of electrical wires and connectors.
• Potting : A resin filling technology used to protect electronic components from water and moisture.
• 3D CMM : A measuring instrument that uses a contact probe to measure workpiece dimensions and verify coordinate accuracy.
• Mold : A tool used to form plastic parts into shapes according to engineering designs.

※For more details, please download the PDF attached to this article or contact us via the form below.