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}.
Practical Affairs>Machine>Tool>Fastening>Fastener>Screw
7-Machine-Tool-Fastening-Fastener-Screw
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224