Enhance your assembly process with our Sems Machine Screw, a reliable fastening solution that combines a sturdy steel construction with a corrosion-resistant zinc finish. Designed to meet ASME B18.13 specifications, this screw features a #4-40 thread size and a convenient pan head with a Torx drive type for easy installation. The included Square Conical Washer provides added stability, making it perfect for a wide range of applications. With a length of 0.3125 inches and full RoHS compliance, you can trust in both its durability and environmental responsibility. Upgrade your hardware with this high-quality component.