Screws and nuts are fundamental mechanical components used in pairs; they achieve a secure connection through the engagement of their threads. Bolts (screws) feature external threads, while nuts feature internal threads; when paired, they serve to firmly join multiple components together. These fasteners come in a vast array of varieties; classified by standard, they include National Standards (GB), American Standards (ASTM/ANSI), British Standards (BS), and others. Their primary materials include carbon steel, stainless steel, and alloy steel.
Often referred to as the "rice of industry," screws and nuts are widely utilized across virtually every industrial sector-including automotive manufacturing, wind power equipment, aerospace, electronics and appliances, and construction engineering. China stands as a major global powerhouse in fastener manufacturing, boasting an industry of immense scale. Currently, the development of these products is trending steadily toward higher strength, enhanced corrosion resistance, intelligent features, and lightweight designs.
