At THREAD INDUSTRIAL CO., LTD., our manufacturing process is engineered for precision, consistency, and control. With nearly four decades of expertise, we have established a vertically integrated production system that manages every stage of fastener manufacturing, from raw material preparation to final inspection and packaging. This comprehensive oversight allows us to meet the most demanding quality standards, including IATF 16949 for the automotive industry, while ensuring supply chain reliability and cost-effectiveness for our global partners.

Stage 1: Raw Material Preparation and Wire Drawing

Our process begins with the selection of premium steel wire rods from certified suppliers. These materials undergo in-house spheroidize annealing to optimize their microstructure for cold forming. Following this, our advanced wire drawing machines reduce the wire to the precise diameter required for each specific product. This critical first step ensures the material possesses the ideal ductility and mechanical properties necessary for high-integrity forming, laying the foundation for a flawless finished product.

Stage 2: Precision Cold Forming and Secondary Operations

Using a comprehensive array of multi-station cold forming machines, the prepared wire is transformed into complex fastener geometries at high speeds. This process shapes bolts, nuts, screws, and custom parts to net or near-net shape, enhancing material strength through work hardening while maintaining exceptional dimensional accuracy. Following forming, parts undergo necessary secondary operations such as threading, tapping, and slotting to meet final design specifications.

Stage 3: In-House Surface Treatment

To provide superior corrosion resistance and meet diverse application requirements, we operate our own surface treatment facilities at both our Taiwan and Vietnam plants. This in-house capability allows for strict process control and reduced lead times. Our primary surface treatment services include:

• Zinc Plating: A widely used coating for corrosion protection in various environments.
• Phosphate Coating: Provides a base for further coating or painting and offers moderate corrosion resistance.
• Hot-Dip Galvanizing: A robust coating process that creates a thick, durable layer of zinc for maximum protection in harsh conditions.

Stage 4: Automated Optical Sorting for Zero-Defect Assurance

For applications where quality is non-negotiable, particularly in the automotive sector, we employ state-of-the-art automated optical sorting machines. These systems meticulously inspect 100% of the parts for dimensional conformity, surface imperfections, and other potential defects. This commitment to advanced inspection technology enables us to achieve the zero-defect delivery standards required by our most demanding OEM and Tier-1 clients.

Stage 5: Rigorous Laboratory Testing and Verification

Underpinning our entire manufacturing process is our in-house quality assurance laboratory, which is accredited to ISO/IEC 17025 and certified by the Taiwan Accreditation Foundation (TAF). Our skilled technicians use a full suite of calibrated testing equipment to conduct comprehensive analyses, including:

• Dimensional and geometric verification
• Mechanical property testing (tensile strength, hardness, torque)
• Material composition analysis
• Surface coating thickness measurement

Every batch is rigorously tested to ensure full compliance with international standards (DIN, ANSI, JIS) and customer-specific engineering drawings before shipment.

THREAD INDUSTRIAL's vertically integrated manufacturing process provides a distinct advantage, offering unparalleled control over quality, production schedules, and costs. By managing every critical step in-house, we deliver precision-engineered fasteners that you can depend on. Contact us to learn how our robust manufacturing capabilities can support your project requirements.