The Fillister Head Machine Screw, a precision-engineered fastener designed for optimal performance in various mechanical applications. This ASME B18.6.3 compliant screw boasts a thread size of 4-40 and is crafted from durable steel with a zinc finish coating, ensuring longevity and resistance to corrosion. Featuring a fillister head and slotted drive type, this screw offers easy installation and secure fastening. With a length of .4375 inches, it is suitable for a wide range of projects. Rest assured, this screw is also RoHS compliant, making it a sustainable choice for your assembly needs.