The common types of wood screws are made of iron and copper, and the types vary depending on the nail head, including round head, flat head, and oval head. There are also two types of screws on the nail head: straight groove screws and cross groove screws. Generally, round head screws are made of soft steel and appear blue, while flat head screws are polished. Oval head screws are usually plated with cadmium chromium and are commonly used for installing hinges, hooks, and other hardware accessories.
Wood screws are similar to machine screws, but the thread on the screw is a specialized thread for wood screws, which can be directly screwed into wooden components (or parts) to securely connect a metal (or non-metal) part with a through-hole to a wooden component. This type of connection is also a detachable connection.
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