Views: 1000 Author: Site Editor Publish Time: 2025-05-07 Origin: Site
A rivet nut, also known as a threaded insert, rivnut or blind nut, is a specialized fastener designed to create durable, load-bearing threads in materials that are too thin or fragile to support traditional threading. It is widely used in applications where access is limited to one side of the material, making it indispensable in industries such as automotive, aerospace, electronics, and construction.
A rivet nut is a tubular fastener with an internally threaded body and a smooth or knurled exterior. Unlike conventional nuts, it is installed by deforming its body to grip the material from within, forming a permanent threaded anchor. This allows bolts, screws, or other threaded components to be securely fastened to thin sheets, hollow structures, or brittle materials.
Shape: Cylindrical or hexagonal body with a flange at one end (to distribute load) and internal threads.
Size: Available in various diameters (e.g., M3 to M12) and lengths to match material thickness.
Knurling: Many rivet nuts have a knurled exterior to enhance grip and prevent rotation after installation.
Flange Options: Flanged rivet nuts provide extra stability, while flush versions suit space-constrained applications.
Open-End Rivet Nuts: Most common type, with a hollow body for general-purpose threading.
Closed-End Rivet Nuts: Seal the threaded hole, ideal for waterproof or airtight applications.
Hexagonal Rivet Nuts: Hex-shaped body prevents rotation in pre-drilled hexagonal holes.
Grooved Rivet Nuts: Feature longitudinal grooves for improved grip in softer materials like plastic.
Materials:
Steel: High strength for heavy-duty applications (e.g., carbon steel).
Stainless Steel: Corrosion-resistant for marine or outdoor environments.
Aluminum: Lightweight and non-corrosive, used in aerospace and electronics.
Brass: Electrical conductivity and corrosion resistance.
Surface Treatments:
Zinc Plating: Basic corrosion protection for steel.
Nickel Plating: Enhanced durability and aesthetics.
Anodizing: For aluminum rivet nuts, improves wear and corrosion resistance.
Rivet nuts are ideal for scenarios requiring strong, reusable threads in thin materials:
Automotive: Securing panels, trim, or components in car bodies.
Aerospace: Fastening lightweight aluminum or composite structures.
Electronics: Mounting circuit boards or chassis in devices.
Construction: Attaching fixtures to metal studs or sheet metal.
Furniture: Assembling modular frames or adjustable components.
The rivet nut works by plastic deformation. When installed, a specialized tool pulls a mandrel through the nut’s body, causing it to expand radially and clamp tightly against the material. The flange (if present) sits flush on the surface, distributing the load evenly. Once installed, the internal threads remain intact, enabling repeated assembly and disassembly of bolts.
Drill a Hole: Create a hole in the material matching the rivet nut’s diameter.
Insert the Rivet Nut: Place the nut into the hole, ensuring the flange contacts the surface.
Tool Engagement: Attach a rivet nut tool (manual, pneumatic, or electric) to the nut’s mandrel.
Compression: Activate the tool to pull the mandrel, expanding the nut’s body and locking it in place.
Mandrel Removal: The tool snaps off the mandrel, leaving a secure threaded insert.
Single-Side Access: No need to reach the back of the material.
Reusable Threads: Unlike self-tapping screws, threads remain undamaged after removal.
Versatility: Compatible with metals, plastics, composites, and more.
Rivet nuts are a versatile, reliable solution for creating strong threads in thin or delicate materials. Their diverse types, materials, and ease of installation make them essential in modern manufacturing and repair. Whether assembling an aircraft or mounting a shelf, rivet nuts ensure secure, long-lasting fastening where traditional methods fall short.
