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Cap Nut (Acorn Nut / Dome Nut) — A hexagon nut with a domed, closed-end top that covers and protects exposed bolt threads. Provides a smooth, finished appearance while preventing thread damage, corrosion, and accidental injury. Manufactured from carbon steel (Class 4/6/8, Grade 2/5/8), stainless steel (304/316, A2-70/A4-70), or alloy steel (Class 8/10/12). Available in metric (DIN 1587, M3–M24) and inch (UNC/UNF, #8–1-1/2″) standards. Widely used in automotive assemblies, machinery guards, furniture, construction equipment, and any application requiring a clean, protective thread cover.
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