A cap nut, also known as an acorn nut, is a type of hex nut with a domed top that covers the exposed bolt end. This closed-end design provides a clean, finished appearance while protecting the threads from damage, corrosion, and accidental contact. Cap nuts are commonly used in furniture, machinery, automotive parts, and decorative applications where both safety and aesthetics are required. They are available in various materials such as carbon steel, stainless steel, brass, and can be supplied with different surface finishes.
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