Cross Recessed Pan Head Self-Drilling Self-Tapping Screw — Product Introduction
The cross recessed pan head self-drilling self-tapping screw is a self-tapping fastener with a pan head (dome-shaped), a cross recess on top, and a drill-like tip at the end. Its current national standard is GB/T 15856.1-2002 (identical to ISO 15481:1999). Its most notable feature is that no pre-drilled hole is required; it can directly complete drilling, tapping, and fastening in thin sheet materials in one operation. Its thread specifications cover ST2.9–ST6.3, and the nominal length range is 6.5 mm–50 mm. It is suitable for multi-layer panel connections, large panel connections, and similar applications, and is widely used in construction, automobile manufacturing, electronics and home appliances, and other industries.
I. Product Features
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Self-drilling drill tail structure: The end of the thread is designed with a drill-like “tail tip,” which can directly drill into the connected parts without pre-drilling.
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Pan head cross recess design: The head is a pan head with uniform force distribution, not easy to damage the panel; the cross recess fits standard cross bits and can be installed at high speed with an electric screwdriver.
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Complete specification system: Thread specifications include ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, and ST6.3. Parameters such as pitch, head diameter, head height, and drilling plate thickness range for each specification are clearly specified.
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Various materials and surface treatments: Commonly used materials include carbon steel (1022A) and stainless steel (304, 316, 410), etc.; carbon steel parts can be treated with blue-white zinc, color zinc, Dacromet, etc., and salt spray time can reach 72H to 720H.
II. Product Advantages
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Drilling, tapping, and fastening completed in one step: No pre-drilling is required, eliminating the drilling process, significantly reducing assembly costs and improving assembly efficiency.
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Saves processes and improves efficiency: Completes drilling, tapping, and fastening in one operation, especially suitable for automated assembly lines and batch assembly operations.
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Large bearing surface of pan head: The pan head has a relatively large diameter, which can disperse pressure when tightening and prevent pull-through in soft materials.
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Good connection rigidity: The self-tapping thread forms a tight fit with the base material, providing good connection rigidity, high load-bearing capacity, and a neat appearance.
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Adapts to various substrates: Suitable for metal thin sheets, plastics, wood, and other materials, with strong versatility.
III. Scope of Application
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Construction and building materials: Connection and fastening of enclosure systems such as light steel buildings, color profiled steel sheets (including insulation panels), and building curtain walls.
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HVAC and electrical: Fastening and installation of HVAC ducts, electrical equipment, steel door projects, etc.
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Automobile manufacturing: Connection parts such as automobile body thin sheets, interior parts, and chassis accessories.
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Electronics and home appliances: Fastening of thin sheet structures for electronic equipment housings and home appliance products.
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General industry: Multi-layer panel connections, large panel connections, and various thin sheet structures requiring rapid single-side assembly.
