Countersunk drilling tail screw is a special fastener that integrates drilling, tapping, and fastening functions. The following provides a detailed description of it from multiple aspects:
• Structural features
Head: A flat countersunk shape similar to ordinary countersunk screws, which can be installed with a surface that is flush with the surface of the connected part, both aesthetically pleasing and not affecting the fit or passage of other components. It is commonly used in situations where high surface flatness is required.
Screw: The screw part is smooth and can be tightened by fitting with the nut.
· Drill tail: it is the key part of the screw, usually with a sharp spiral edge design, similar to the cutting part of the Fried Dough Twists drill. The blade angle and spiral groove are specially designed to quickly drill through various materials such as metal and plastic.
• Material type
Carbon steel: Low cost, good strength, but poor corrosion resistance, generally requires surface treatment such as galvanizing to improve rust prevention ability, suitable for ordinary occasions with low requirements for corrosion resistance.
Stainless steel: It has excellent corrosion resistance and oxidation resistance, and can be used in harsh environments such as humidity, acidity, and alkalinity. It has a long service life, but is relatively expensive and is commonly used in outdoor facilities, medical equipment, and other fields.
Alloy steel: By adding alloying elements, screws are endowed with special properties such as high strength and toughness, making them suitable for engineering projects that require high mechanical performance.
• Specifications and models
The specification representation method is usually "nominal thread diameter x screw length", such as M4 x 25, which means the nominal thread diameter is 4 millimeters and the screw length is 25 millimeters. Diameter specifications commonly include M3, M4, M5, M6, etc., with lengths ranging from tens of millimeters to hundreds of millimeters to meet the connection needs of materials of different thicknesses.
• Working principle
By relying on the rotation and axial pressure generated by electric tools (such as drills), the spiral edge of the drill tail cuts through the material. At the same time, during the rotation and propulsion process, the screw's own thread squeezes out the internal thread in the drilled hole, achieving one-time completion of drilling, tapping, and fastening, greatly improving work efficiency.
• Application scenarios
Construction industry: In steel structure construction, metal roof installation, indoor decoration ceiling keel fixation and other operations, countersunk drilling screws can quickly and firmly connect metal sheets, keels and other components to ensure structural stability.
Automotive manufacturing: used for connecting metal parts of car bodies, frames, and other parts, meeting the requirements of lightweight and high-strength cars while ensuring a smooth appearance.
Furniture manufacturing: During the assembly of panel furniture and metal furniture, rapid connection between the panel and metal frame can be achieved without the need for pre drilling and tapping, simplifying the assembly process and improving production efficiency.
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