The durable and reliable Flat Head Machine Screw, crafted from high-quality stainless steel for maximum strength and corrosion resistance. Featuring a sleek black passivate finish, this screw not only offers a sleek appearance but also provides enhanced protection against environmental elements. With a 4-40 thread size and Phillips drive type, it's perfect for a variety of applications. The ASME B18.6.3 specification ensures precision engineering, while its 0.3125-inch length makes it versatile for use in different projects. Rest assured, this screw is fully compliant with RoHS regulations, making it an environmentally friendly choice for your fastening needs.