Complete Selection and Matching Standard Guide of Sheet Metal Clinch Fasteners

Complete Selection and Matching Standard Guide of Sheet Metal Clinch Fasteners

The stability of sheet metal chassis and equipment frames depends heavily on clinching fastener selection and process matching. Most mass production defects such as loosening, bulging and cracking are caused by improper selection, incorrect hole size and unqualified pressing process rather than product quality problems.

1. Functional Differences of Four Main Clinching Products

Clinch nuts are used for internal thread forming on thin plates. Clinch studs are applied for spacing and layered support. Clinch screws form external threads directly. Expansion nuts are suitable for ultra-thin and soft aluminum sheets with low deformation risk.

2. Matching Rule of Plate Thickness

Each clinch fastener has a strict applicable plate thickness range. Improper thickness matching will cause back bulging or insufficient biting force. Select low-profile fasteners for thin plates and long-tooth fasteners for thick plates.

3. Material Adaptation Standard

Carbon steel plates fit standard fasteners. Stainless steel requires hardened special clinch parts. Aluminum sheets need low-interference and shallow-tooth fasteners to avoid cracking and deformation.

4. Common Defects and Improvement Solutions

Solve loosening by adjusting hole tolerance and pressing force. Eliminate bulging by optimizing pressing speed. Prevent cracking by removing burrs before pressing. Calibrate tooling regularly to ensure vertical pressing accuracy.

5. Final Acceptance Specification

Qualified products feature flat surface, no gap, smooth thread and qualified push-out force. Strict first-piece inspection is required before mass production.