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Tech Breakthroughs Propel Localization of EV Fasteners

[Abstract]:Driven by the policy goal set in the "New Energy Vehicle Industry Development Plan" to achieve a 90% localization rate for key components, the full-scale campaign to localize new energy vehicle (NEV) fasteners was officially launched in 2025.

Driven by the policy goal set in the "New Energy Vehicle Industry Development Plan" to achieve a 90% localization rate for key components, the full-scale campaign to localize new energy vehicle (NEV) fasteners was officially launched in 2025. Leveraging core technological breakthroughs such as rare-earth micro-alloying, this critical push is steadily breaking the monopoly of foreign enterprises in the high-end fastener sector and driving the continuous rise of domestic fastener penetration in NEV models.

The unique demands of NEVs have become the central focus of this localization effort. Compared to traditional internal combustion engine vehicles, the battery packs, motors, and electronic control systems in NEVs impose a triple requirement on fasteners: "high strength, lightweight, and corrosion resistance." Specifically, battery pack bolts must withstand temperatures above 150℃ while offering anti-hydrogen embrittlement properties; motor bolts need to meet strength grades of 10.9 or higher; and vehicle lightweighting requires fasteners to reduce their weight by over 30%. These demanding specifications were long dependent on imported products, with German Bosch and Japanese Fuji occupying over 70% of China's high-end market.

Technological breakthroughs by leading enterprises have served as the key turning point in this campaign. Jiaxing Xingchen Auto Parts Co., Ltd. utilized rare-earth micro-alloying technology to implant 3nm yttrium-based particles into a boron steel matrix, developing the HT-7 modified material. This innovation boosted the tensile strength of fasteners to 1450MPa with an elongation of 18%, while keeping the hydrogen embrittlement risk factor below 0.01—far surpassing the performance metrics of conventional 40Cr materials. Battery pack bolts made from this material passed a rigorous 3000-hour salt spray test and successfully entered the supply chain for BYD's Seal model. Meanwhile, Ningbo Yongnian Fastener broke through with a micro-arc oxidation process for titanium alloy surfaces. Their motor bolts demonstrated a 300% increase in fatigue life under extreme cold conditions of -40℃, securing bulk orders from NIO. These technological strides lifted the penetration rate of domestic high-end fasteners in NEV models from 45% in 2024 to 62% in 2025.

This concerted push has triggered explosive growth in niche markets. Data shows that the market size for NEV-specific fasteners surged from 8.5 billion yuan in 2024 to 12.7 billion yuan in 2025, with three segments standing out: the demand for insulated coating fasteners driven by high-voltage fast charging is projected to reach 9.5 billion yuan by 2030; structural-functional integrated fasteners spurred by Cell-to-Chassis (CTC) technology are seeing a compound annual growth rate of 31%; and mass production is imminent for anti-hydrogen embrittlement specialty bolts used in hydrogen fuel cell vehicles. To accelerate technology transfer, the industry has established joint task forces involving "OEMs, fastener manufacturers, and steel mills." For instance, BYD partnered with Jinyi Industrial to develop an integrated die-casting body connection system, which reduced the number of fasteners per vehicle by 40% while increasing connection strength by 25%.

Continuous policy reinforcement is providing a strong safety net for this initiative. The "Technology Roadmap for New Energy Vehicle Fasteners," released by the China Automotive Technology and Research Center (CATARC), outlines phased breakthroughs for 28 bottleneck technologies. Furthermore, five mandatory standards scheduled for implementation in 2026 are expected to directly drive a 35% annual increase in demand for high-voltage resistant insulated fasteners. Industry forecasts predict that by 2030, China will establish a fully autonomous supply chain system valued at 200 billion yuan, with the localization rate of NEV fasteners exceeding the 90% target, cementing its position as a core competitive advantage in the global new energy vehicle supply chain.

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Tech Breakthroughs Propel Localization of EV Fasteners

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