Wood Screws: These screws are typically used to connect wooden components, such as the seat, backrest, and armrests of a chair. Wood screws usually have flat heads to sink into the wood surface and provide a better appearance.

Metal Screws: Metal screws are commonly used to connect metal components of a chair, such as the metal frame or support structures. These screws may have different types of heads, such as flat heads, round heads, or hexagonal heads, to accommodate various installation requirements.

Self-Tapping Screws: These screws have a special design that allows them to cut threads into the material surface, eliminating the need for pre-drilling. They are often used to connect metal to metal or metal to plastic.

Bolts and Nuts: Bolts pass through holes in different parts of the chair and are then secured with nuts. This type of connection is typically used in areas requiring stronger support, such as connecting the chair base to the seat.

Assembly Screws: These screws are commonly used for quick assembly of furniture. They may have special head designs, such as Phillips, square, or Torx heads, to allow for easy tightening with a screwdriver or wrench.