ابزارسازی انواع مقالات دانشجويي خودروسازی دانستني ها ذوب فلزات رشته مهندسی مکانیک فيزيك مقالات علمي مهندسي مكانيك مکانیک در حرارت و سیالات مکانیک در ساخت و تولید مکانیک در طراحی جامدات پیچ (انگلیسی)
A screw is a shaft with a helical groove or thread formed on its surface. Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force. It can also be defined as an inclined plane wrapped around a shaft.
A screw used as a threaded fastener consists of a shaft, which may be cylindrical or conical, and a head. The shaft has a helical ridge or thread formed on it. The thread is essentially an inclined plane wrapped around a shaft. The thread mates with a complementary helix in the material. The material may be manufactured with the mating helix (taps and dies), or the screw may create it when first driven in (a self-tapping screw). The head is specially shaped to allow a screwdriver or wrench (British English: spanner) to grip the screw when driving it in. It also stops the screw from passing right through the material being fastened and provides compression.
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