Enhance your fastening projects with our Sems Machine Screw. Crafted from durable steel and finished with a protective zinc coating, it ensures long-lasting performance. Featuring a 4-40 thread size, this ASME B18.13 compliant screw is perfect for various applications. The included split lock washer provides added security, while the pan head and Phillips drive type make installation a breeze. Measuring at .3125 inches in length, it offers versatility for different projects. Upgrade your hardware arsenal with this reliable and efficient machine screw.