Ensure stable assembly torque and improve connection reliability Residual metal debris and cold forging oil trapped at thread roots and in blind holes may form interlayers during assembly, resulting in torque scatter and unstable preload. Even when tightened to the specified torque, the actual clamping force may be insufficient. Under long-term vehicle vibration, bolts are prone to loosening and slippage, raising the risk of failure for critical connections such as chassis and battery packs. Proper cleaning removes contaminants inside threads to ensure uniform fitting of thread pairs and stable, controllable preload.

High-voltage safety of new energy three-electric systems (core focus for new energy vehicles) Fasteners used in high-voltage connections of power batteries and motors require extremely high cleanliness. Residual fine metal particles are conductive impurities. If they remain on high-voltage mating surfaces, they can easily cause electric arcs, short circuits and even thermal runaway, directly endangering vehicle safety. Fastener cleaning is an essential process for high-voltage components to meet the ISO 16232 technical cleanliness standard and eliminate electrical hazards caused by conductive particles.

Guarantee adhesion of anti-corrosion coatings and extend fastener service life Fastener cleaning serves as a critical pre-process for surface treatments including Dacromet, zinc-aluminum coating and phosphating. Residual oil and dust on the surface cause coating peeling, pinholes and poor adhesion, leading to partial detachment of anti-corrosion layers and rapid bolt corrosion. Thorough cleaning delivers a clean metal substrate to enable uniform bonding of anti-corrosion coatings, prolong fastener service life under harsh road and humid environments, and reduce risks of long-term corrosion failure for vehicles.

Reduce thread wear and seizure for convenient disassembly and maintenance Metal particles trapped between threads cause abrasive wear during assembly and repeated disassembly, scratching thread profiles and resulting in bolt galling or seizure, which makes maintenance removal difficult. Cleaning eliminates particulate contaminants, reduces wear of thread pairs and preserves the reusability of fasteners.

Meet quality requirements of OEMs and Tier 1 suppliers and avoid quality claims Major vehicle manufacturers adopt ISO 16232 / VDA 19 technical cleanliness specifications. Fastener cleanliness is a key item for incoming inspection. Substandard cleaning will lead to incoming rejection and batch returns. Quality failures after vehicle assembly may incur costly compensation and production line shutdown losses. Reliable precision cleaning is a basic requirement for component manufacturers to qualify for automotive supply chains.

Improve production consistency and reduce downstream failures Large batches of fasteners with fluctuating cleanliness will cause unstable assembly quality. Standardized cleaning equipment can steadily control the quantity and size of contaminant particles, unify part conditions, reduce random failures in subsequent assembly and testing processes, and raise the final pass rate of finished vehicles.