螺絲釘(英語:threaded screw)也簡稱螺釘(screw)或螺絲(漢語口語的誤稱,「螺絲」其實指的是螺紋),是一種常見的螺紋緊固件,在家具、電器、機械、建築物甚至骨科都廣泛使用,一般材質為金屬或塑料。螺釘的主要功能是利用螺紋的正向力和摩擦力提供較為可靠的縱向拉力將兩個物體接合在一起,或者提供可以固定某一物體位置的掛點。螺釘因為依賴螺紋抓固,可以比只依賴摩擦力的釘子更牢固,有需要時也可隨意移除或重新嵌緊並能重覆使用。
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