Upgrade your fastener kit with this 25-piece set of #4-40 × 1/4″ countersunk flat-head hex socket cap machine screws. Crafted from high-strength 10.9 grade carbon steel and finished in sleek black oxide, these screws combine outstanding durability with a professional appearance. The countersunk flat head allows each screw to sit flush in your workpiece, offering a snag-free surface and a clean aesthetic. The hex socket drive ensures secure tool engagement, enabling you to apply greater torque without stripping the head. Fully threaded to the head, these screws deliver maximum holding power—whether you're fastening into tapped holes or using nuts. Perfectly sized for electronics enclosures, office equipment, furniture assembly, 3D printers, and a wealth of general-purpose fastening tasks, this 25-piece pack ensures you have the right hardware on hand for every job. Elevate your projects with reliable, high-performance screws that stand up to the toughest demands.