1. Material Upgrade: Magnesium-aluminum alloy and carbon fiber composite fasteners are gradually replacing traditional steel components.
2. Intelligentization: Smart bolts with sensors can monitor preload in real time and have been applied to high-speed rail bogies, with a data error of <3%.
3. Green Manufacturing: The EU will mandate chromium-free fastener plating from 2025; domestically, environmentally friendly zinc-nickel alloy coating technology has been developed.
