Cap nuts, also known as acorn nuts or dome nuts, are specialized fasteners designed for both functional and aesthetic purposes. These hex-shaped nuts feature a closed, domed end that covers exposed threads, providing a smooth, finished appearance while protecting against environmental factors, debris, and potential injury from sharp thread ends. They are commonly used in applications where safety and visual appeal are important, such as furniture assembly, automotive components, and decorative fixtures. While a Hexagon Nut is a standard open-ended fastener, the cap nut offers enhanced protection. Similarly, a Square Nut is typically used with a wrench in specific assemblies, but lacks the enclosed design. For applications requiring a built-in washer, a Hexagon Flange Nut distributes load, whereas a cap nut focuses on sealing the end. When vibration resistance is critical, a Lock Nut is the preferred choice, though some cap nut variants can also incorporate locking features.

The Cap Nut is engineered from high-strength materials to ensure reliability across various industrial and commercial uses. Available in different grades and finishes, it provides excellent corrosion resistance and durability. Below are the detailed product parameters for the Cap Nut, presented in both a list and a table for clarity.

• Material: Available in Carbon Steel, Stainless Steel (Grades 304 and 316), and Brass.
• Finish/Plating: Zinc Plated, Hot-Dip Galvanized, Chrome, and Nickel Plating options.
• Thread Size: Standard metric (M4 to M20) and imperial (1/4" to 3/4") sizes.
• Thread Pitch: Coarse and fine thread pitches available depending on the size.
• Height: Varies with thread size; typically 1.5 times the nominal diameter for standard types.
• Drive Type: Hex drive, compatible with standard wrenches and sockets.
• Standards: Complies with DIN 1587, ISO 7041, and other international standards.
• Temperature Range: Suitable for -50°C to +300°C, depending on material.
• Proof Load: Varies by material and grade; e.g., Carbon Steel Grade 8: 120,000 psi.
• Corrosion Resistance: Rated based on material; Stainless Steel 316 offers the highest resistance.