Views: 0 Author: Site Editor Publish Time: 2026-10-23 Origin: Site
Directly tapping threads into sheet metal under 2.5mm results in only 1 to 2 thread pitches of engagement, leading to thread stripping under minimal torque. Industrial sheet metal manufacturing requires:
High Push-Out & Torque-Out Resistance: Fasteners must withstand axial bolt tightening torque without spinning or dislodging.
Compatibility with Post-Finishing: Hardware must install securely after anodizing, powder coating, or electroplating without damaging surface aesthetics.
Single-Sided Access Capability: For closed tubular frames and hollow box profiles, fasteners must install blindly where rear-side access is impossible.
┌────────────────────────────────────────────────────────────────────────┐ │ SHEET METAL THREADING FASTENERS │ ├──────────────────────────────────┬─────────────────────────────────────┤ │ 1. Self-Clinching Nut │ 2. Blind Rivet Nut (Threaded Insert)│ │ [Clinched Undercut Groove] │ [Collapsible Bulge Section] │ │ ▼ │ ▼ │ │ Installed via hydraulic press │ Installed with mandrel pull tool │ │ Sheet metal cold-flows into │ Collapses into bulb on blind side│ │ annular locking groove │ (Requires single-side access) │ └──────────────────────────────────┴─────────────────────────────────────┘
Installation Mechanics: The nut is placed into a punched or laser-cut hole in ductile metal sheet. A parallel hydraulic press applies squeezing force, forcing the serrated clinching ring into the sheet surface. Displaced metal cold-flows into an undercut groove around the nut shank, locking it permanently.
Key Strength: Completely flush reverse side; excellent coaxial alignment for automated electronic chassis.
Installation Mechanics: Inserted into a pre-drilled hole from one side. A pneumatic or manual installation tool threads a mandrel into the nut and pulls backward, collapsing the unthreaded thin-walled barrel outward into a bulb that clamps the sheet securely against the head flange.
Key Strength: Requires access from only one side; suitable for tubular frames, curved pipes, and closed structural boxes.
| Comparison Parameter | Self-Clinching Nuts (Clinch Nuts) | Blind Rivet Nuts (Threaded Inserts) |
|---|---|---|
| Access Requirement | Requires parallel access to both sides (Hydraulic Press) | Requires single-sided access only (Blind Installation) |
| Reverse Sheet Profile | Completely Flush (No protrusion on reverse face) | Protrudes with a collapsed bulb ring on the reverse face |
| Compatible Base Materials | Ductile Sheet Metal (Must be softer than the fastener) | Steel, Aluminum, Plastics, Composites, Fiberboard |
| Installation Tooling | Stamping press or dedicated hydraulic clinching machine | Hand, pneumatic, or battery-powered blind rivet nut tool |
| Typical Applications | Server power supplies, IT racks, precision medical chassis | Automotive tubular chassis, HVAC ducting, furniture frames |
Answer: The sheet metal must be softer than the clinching fastener. The clinching process relies on the nut deforming the sheet metal to force it into the undercut groove. If the sheet metal is harder than the nut, the nut's serrations will crush without displacing sheet material, causing immediate push-out failure.
Answer: Spin-out is generally caused by an oversized installation hole, insufficient mandrel stroke during installation (resulting in an incompletely formed bulb), or excessive bolt torque during assembly. Specifying hexagonal or knurled-body rivet nuts significantly improves anti-rotation torque resistance.
Donghuang Hardware supplies standard metric (M3–M12) and imperial clinching and rivet nuts in zinc-plated carbon steel and stainless steel grades.
Product Catalog: Access the nut catalog at dh-hardware.com/Nut-pl46711397.html.
Direct Inquiries: Email tony@wf-fastener.com / Call +86-13355841616.
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