Leading automotive manufacturers follow a rigorous selection process when choosing bolts and nuts suppliers. Quality, durability, and compliance with international standards like ISO and IATF are top priorities. Manufacturers assess a supplier’s production capabilities, material certifications, testing procedures, and traceability systems. Consistent supply, cost-efficiency, and the ability to meet tight delivery schedules are also key. Strong emphasis is placed on supplier reputation, innovation, and the ability to support long-term partnerships. Environmental responsibility and ethical sourcing are increasingly important factors. This article explores how these criteria influence supplier selection in the highly demanding and competitive automotive industry.