Joining screw

fasteningwingplastic

The plastic head thumb screw combines a durable steel threaded body with a molded plastic knob, allowing quick and tool-free fastening. With zinc-plated protection and ±0.01 mm precision tolerance, it ensures reliable performance in machinery, furniture, and equipment applications. The production of the plastic head thumb screw begins with metal processing, where high-quality steel is cut and formed through cold heading or CNC machining. The threaded body is then precision rolled or milled, achieving tight tolerance of ±0.01 mm for smooth and accurate fastening. Next, the screw body undergoes surface treatment, typically zinc plating, which provides corrosion resistance and durability for long-term use. In the following stage, the steel screw is combined with the plastic knob through injection molding. During this process, high-strength engineering plastics such as PA or PP are molded directly onto the metal shaft, forming a strong mechanical bond and ensuring ergonomic grip. Finally, each screw is subjected to dimensional inspection and functional testing to verify thread accuracy, surface quality, and fastening performance. With HLC's automated production lines and IATF 16949, certified quality system, we ensure every thumb screw meets international standards and customer-specific requirements. At HLC, we combine over 20 years of experience in metal fabrication and plastic injection molding, allowing us to deliver reliable composite products such as plastic head thumb screws. With in-house tooling, CNC machining, and automated injection molding, we ensure precision tolerance of ±0.01 mm and consistent quality. Our facilities are IATF 16949 and ISO 13485 certified, backed by automated inspection systems to guarantee durability and performance. Whether you need small-batch prototypes or high-volume production, HLC provides customized fastening solutions that reduce costs, improve efficiency, and meet international standards. - Material: Steel screw + Plastic head - Surface: Zinc plated - Tolerance: ±0.01 mm - Application: Tool-free fastening and adjustment in machinery, furniture, and equipment