In the quality inspection of fastener products, a series of key inspection items are usually involved.

Firstly, the thickness of each slot of the product is inspected. The uniformity and accuracy of the slot thickness are crucial for the installation and stability of the fastener during use. Then, the inner hole diameter is measured. The size of the inner hole diameter directly affects the fitting accuracy with other components. The inspection of concentricity is also indispensable. Good concentricity can ensure the smoothness and reliability of the fastener during operation.

The inspection of the surface condition is equally important. It is necessary to check whether there is deformation, damage on the surface, and whether the electroplating quality is good. Any surface defect may affect the appearance and rust prevention performance of the fastener. For the bottom groove products, it is necessary to check whether there are corner missing, material pressing and other problems.

The burrs and chipping in the inner hole cannot be ignored, which may cause jamming during installation or damage to other components. The poor electroplating and chipping defects at the bottom of the thread are the key inspection objects, as this will seriously affect the fastening effect and service life of the fastener.

The inspection accuracy is required to reach ± 0.02 mm to ensure the accuracy and reliability of the inspection results. The inspection speed is between 300 - 1200 pcs/min to meet the production needs of different scales.

Through strict control of these inspection items, the quality of fastener products can be effectively guaranteed, providing a reliable guarantee for the production and use in related industries.

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