This Sems Machine Screw is a versatile and essential component for various assembly and fastening applications. With a thread size of 4-40 and a durable steel construction, it offers reliable performance and longevity. The zinc finish coating not only enhances its corrosion resistance but also adds a sleek and professional look to the finished product. Featuring a split lock washer and a pan head with a Phillips drive type, installation is efficient and secure. At a length of .3125 inches, it is suitable for a range of projects. Rest assured, this product is RoHS compliant, meeting strict environmental standards. Upgrade your fastening arsenal with this high-quality machine screw.