4-40 x 3/8 Coarse Socket Set Screws

These 4-40 x 3/8 Coarse Socket Set Screws from Midwest are crafted from high-quality steel with a durable black oxide finish, offering excellent corrosion resistance and a sleek matte-black appearance. Designed with a recessed hex socket, they allow for precise torque application using an Allen wrench or hex driver, ensuring secure fastening without the risk of stripping. The hardened steel construction provides strong resistance to bending, shearing, and wear, making these screws reliable for demanding mechanical and machinery applications.

Ideal for precision machinery assembly, these set screws sit flush or completely inside tapped holes, delivering a hidden fastening solution that maintains a clean and unobtrusive finish. Their vibration-resistant design ensures components stay securely in place, making them perfect for industrial, manufacturing, and DIY projects where both performance and aesthetics matter.

Whether used in industrial equipment, machinery, or custom builds, these Midwest socket set screws provide a professional-grade fastening option that combines strength, durability, and a polished look. Keywords include set screws, socket set screws, black oxide screws, precision fastening, and corrosion-resistant screws.