These spring nuts are dedicated fittings for European standard aluminum profiles, supplied in nickel-plated and 304 stainless steel versions with good rust and corrosion resistance for long-term industrial use. Featuring elastic leaf spring or ball spring structure, they can be snapped and positioned freely in T-slots of 20/30/40 series profiles, allowing quick installation and position adjustment without pre-drilling or fixed mounting. With stable elastic locking and anti-loosening performance under vibration, they are widely used in aluminum profile frames, automation equipment, workbenches, racks and assembly structures. Full specifications for 20/30/40 profiles are available with factory direct supply, providing reliable and convenient fastening solutions for profile assembly.