High - quality nylon fasteners have a uniform color, free of spots or color differences. Inferior products may have uneven colors, which could be due to issues such as unstable injection - molding temperatures or poor pigment dispersion. These problems can affect the overall performance of the fasteners, indicating potentially poor quality.
High - quality nylon fasteners should have a smooth surface, without obvious burrs or unevenness. Inferior products have a rough surface, possibly with burrs or irregularities.
High - quality products have neat edges, free of burrs or cracks. Inferior products may have rough edges, and there could even be cracks or burrs.
The threads of nylon bolts and nuts should be clear, complete, and the thread profiles should be full. If the threads are blurred, with missing or broken teeth, it will affect the matching accuracy with other components, resulting in loose connections. Moreover, problems such as loosening and thread slipping may occur during use.
The thread surface should be smooth, without a rough feeling or attached impurities. If the thread surface is rough, it will increase the friction during installation, making the installation difficult. Additionally, it may damage the threads during installation, reducing the reliability of the connection.
For transparent or semi - transparent nylon fasteners, you can check for the presence of bubbles or impurities inside. If there are a large number of bubbles inside, it will reduce the strength and toughness of the fasteners. The presence of impurities may indicate impure raw materials or foreign objects mixed in during the production process, which will also affect the product quality.
Although the internal situation of non - transparent nylon cannot be directly observed, if there are some raised areas or discolored spots on the surface that are suspected to be impurities, it may imply similar problems inside, suggesting potentially poor product quality.
