This Steel Flat Head Machine Screw is an essential fastener for various applications. With a 4-40 thread size and a Phillips drive type, it offers secure and convenient installation. The screw features a durable zinc finish coating for added protection against corrosion, making it suitable for both indoor and outdoor use. Measuring .3125 inches in length, it is ideal for fastening components in tight spaces. Its ASME B18.6.3 specification guarantees high quality and performance. Additionally, this screw is compliant with RoHS regulations, ensuring environmental responsibility. Upgrade your fastening solutions with this reliable and versatile flat head machine screw.