Ensure the secure fastening of #4-40 Self-Clinching Nuts with our innovative solution, featuring a PEM® PreTect™ Thread Masking Plug pre-installed for added protection. Crafted from 300 Series Stainless Steel and RoHS compliant, these nuts guarantee durability and environmental safety. The Passivated finish coating enhances corrosion resistance, making them ideal for various applications. With precise dimensions, including a .038-inch shank and .166-inch hole size in the sheet, these nuts offer reliable performance. Experience ease of installation and long-term reliability with these meticulously engineered components.