Screws {screw, tool} include screws {wood screw} with pointed ends that go into soft materials and have smooth shank near head, which can be flathead screw, roundhead screw, or oval-head screw. Screws {machine screw} can have flat ends and go into nuts or sockets. Wallboard screw or drywall screw has Phillips head. Deck screw is long and thin. Screws {lag screw} can have hex head or square head, with no slot. Metal screw can be sheet metal screw or self-tapping screw. Heads can be slot {straight-slot head}, cross {Phillips head}, slot and quartered {one-way head}, or square {Robertson head}.
Screws {setscrew} can prevent relative motion between attached pieces.
Some screws {thumbscrew}| can turn using thumb and fingers.
7-Machine-Tool-Fastening-Fastener
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Date Modified: 2022.0225