In the realms of mechanical manufacturing, construction engineering, automotive production, as well as daily life, bolts and nuts serve as fundamental fasteners that play an indispensable role. They achieve a secure connection between two or more components through the mutual engagement of threads. Although similar in function, bolts and nuts differ in structure, characteristics, and application scenarios. This article delves into the distinctions and applications of common bolts and nuts by referencing various types depicted in images.