Machine screws are threaded fasteners designed to be used with tapped holes or nuts for fastening metal parts together. They are versatile components commonly used in a wide range of applications, including machinery, equipment assembly, automotive, electronics, and appliances.

Here are some key characteristics of machine screws:

Thread Type: Machine screws have uniform, closely spaced threads along the entire length of the shaft. These threads are typically finer than those of wood screws, allowing for a more precise fit when mating with nuts or threaded holes.

Head Type: Machine screws come with a variety of head types, each serving a specific purpose. Common head types include flat (countersunk), oval, pan, round, hexagonal (hex), and socket (Allen) heads. The choice of head type depends on the application requirements, such as the desired appearance, clearance, or access for tooling.

Material: Machine screws are available in various materials, including steel, stainless steel, brass, and nylon. The choice of material depends on factors such as the desired strength, corrosion resistance, and aesthetic appearance of the finished assembly.

Size: Machine screws are available in a wide range of sizes, typically specified by their diameter (measured in millimeters or inches) and thread pitch (number of threads per unit of length). Common sizes range from M2 to M12 or #4 to 1/2 inch, with coarse or fine thread options.

Machine screws are commonly used in conjunction with nuts, threaded inserts, or tapped holes to create secure connections between components. They offer several advantages, including: