Views: 1000 Author: Site Editor Publish Time: 2025-03-31 Origin: Site
A self-clinching nut, also known as a press nut or threaded insert, is a specialized fastener designed to create durable, load-bearing threads in thin metal sheets or panels. Unlike traditional nuts, it does not require welding, adhesives, or additional hardware for installation. Instead, it is permanently embedded into pre-drilled holes using compressive force, forming a secure and vibration-resistant thread for bolts or screws. This makes it ideal for applications where space, weight, or assembly efficiency is critical.
Self-clinching nuts come in several configurations:
Floating Nuts: Allow slight lateral adjustment post-installation.
Blind Nuts (Closed-End): Seal threads to prevent fluid ingress.
Through-Hole Nuts: Enable bolt passage for through-fastening.
Flange Nuts: Wider base for enhanced load distribution.
High-Strength Nuts: Reinforced for heavy-duty applications.
Common design codes include PEM CLS series (e.g., CLS 632-3 for M3 threads), ATF FN series, and Bollhoff RND®, with codes specifying dimensions and materials.
Stainless Steel (e.g., SS 304/316): Corrosion-resistant for harsh environments.
Carbon Steel (e.g., Grade 8): Cost-effective with zinc plating for moderate corrosion protection.
Aluminum: Lightweight, suitable for non-corrosive applications.
Thread sizes range from M3 to M12, with shank diameters between 3 mm to 12 mm, tailored to sheet thickness (typically 0.5 mm to 6 mm).
These nuts feature a cylindrical body with knurled or serrated surfaces to prevent rotation. Flanged variants have a broad base, while closed-end types include a domed top. Surface finishes vary, including plain, zinc-plated, or anodized coatings.
Drill a Hole: Precision-drill a hole matching the nut’s shank diameter.
Align and Press: Position the nut and apply hydraulic/pneumatic pressure (e.g., 2–5 kN for M5 nuts).
Deformation: The nut’s serrations grip the sheet, while its collar deforms the surrounding metal, creating a permanent lock.
The nut’s shank displaces sheet metal during compression, forming a mechanical interlock. The knurling prevents rotation, and the collar distributes axial loads evenly, ensuring thread integrity under stress.
Electronics: Mounting PCBs in server racks or enclosures.
Automotive: Securing interior panels, sensors, or wiring harnesses.
Aerospace: Assembling lightweight aircraft components.
Industrial Machinery: Fastening access panels or guards.
