What is the most common material used for threaded fasteners?

The most common material used for threaded fasteners is carbon steel. This is primarily due to its strength, durability, and cost-effectiveness, making it an ideal choice for a wide range of applications across various industries. Carbon steel fasteners are typically made from steel that contains carbon, which enhances the material's hardness and tensile strength through heat treatment and other processes.

In addition to its mechanical properties, carbon steel can be easily manufactured and treated to improve its performance, such as through galvanization for corrosion resistance. Many applications, from automotive to construction, utilize carbon steel fasteners because they provide reliable performance and hold up well under tension and shear forces common in fastening applications.

While materials like stainless steel, aluminum, and brass have their specific benefits and applications—such as resistance to corrosion, lightweight properties, or aesthetic appeal—the widespread availability and versatile properties of carbon steel ensure it remains the most prevalent material for threaded fasteners.