Our M3 flat head helmet nuts are specially designed for protective helmet accessory installation and fixing. Made of high-strength carbon steel, processed with premium black Dacromet surface treatment, it features excellent anti-rust, anti-corrosion and wear-resistant performance, adapting to various outdoor and complex working environments. Adopting low-profile flat head design, it fits perfectly with helmet mounting positions, installs smoothly without protruding, and keeps the overall appearance neat and streamlined. Precision CNC threaded M3 standard size, with accurate tolerance, smooth thread engagement, firm locking and good anti-loosening effect during daily use and sports activities. Widely applicable for safety protective helmets and matching accessory fastening assembly. Factory direct supply, stable quality, complete specifications in stock, support batch wholesale and customized non-standard size processing.