Machine screws are designed for fastening parts together in a pre-threaded hole or with a matching nut. Their straight shank and uniform threads create a secure, precise hold, which makes them a common choice for equipment, electronics, repairs, and general assembly work.

Steel machine screws are the most widely used option for everyday fastening. Zinc-plated steel is a popular choice for general use, while yellow zinc finishes are often found in electronics. Black zinc and black oxide finishes are useful when you want the screw to blend in with black or dark-colored components.

18-8 stainless steel machine screws are a good fit for applications where corrosion resistance matters. They are often used in environments exposed to moisture, as well as in food processing and refrigeration equipment. For jobs that need higher strength, 410 stainless steel offers greater hardness and tensile strength, though it does not resist corrosion as well as 18-8 or 316 stainless steel.

Aluminum machine screws are often chosen when corrosion resistance, lighter weight, and conductivity are important. They can also be a cost-effective alternative in some applications. For best results, aluminum screws are typically paired with aluminum nuts to help reduce wear and material reaction.