Large flat head cross drill thread
Dacromet pancake head self – drilling screws are crafted from a variety of high – performance materials, carefully selected to meet diverse application demands. Carbon steel is a commonly employed base material, especially in grades such as 45# and 65Mn.
Description
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Product Material
Dacromet pancake head self - drilling screws are crafted from a variety of high - performance materials, carefully selected to meet diverse application demands. Carbon steel is a commonly employed base material, especially in grades such as 45# and 65Mn. These carbon steel grades can be heat - treated to optimize their mechanical properties. Heat - treated carbon steel screws exhibit enhanced tensile strength, improved hardness, and superior toughness, enabling them to withstand significant loads and stresses during installation and operation.
For applications that demand higher strength and better fatigue resistance, alloy steel is often utilized. Alloy steel, which may contain elements like chromium, molybdenum, and vanadium, undergoes specific heat - treatment processes to achieve excellent mechanical performance. Such screws are capable of withstanding dynamic loads and vibrations, making them suitable for heavy - duty applications.
In scenarios where corrosion resistance is of utmost importance, stainless steel is the material of choice. Stainless steel grades 304 and 316 are frequently used. 304 stainless steel provides good general - purpose corrosion protection, making it suitable for indoor and many outdoor applications with moderate environmental exposure. 316 stainless steel, with its higher molybdenum content, offers enhanced resistance to harsh chemicals, saltwater, and extreme conditions, making it ideal for marine, chemical, and food - processing industries.
Product Models
The product line of Dacromet pancake head self - drilling screws includes various models categorized by size, length, thread type, and drill tip design:
Standard Dacromet Pancake Head Self - Drilling Screws: These are the most common type, available in a wide range of sizes. Metric sizes typically range from M3 to M8, while imperial sizes cover from #6 to 5/16". Standard screws feature a typical pancake - head shape, which provides a large bearing surface for even pressure distribution. They have a standard thread pitch optimized for self - drilling in materials like metal sheets, wood, and some composite materials. The self - drilling tip is designed to penetrate the material efficiently, reducing the need for pre - drilling.
Heavy - Duty Dacromet Pancake Head Self - Drilling Screws: Engineered for more demanding applications, heavy - duty screws are made with larger diameters and thicker shanks. Crafted from high - strength alloy steel, they can withstand greater tensile and shear forces. These screws are often longer in length to ensure a secure fastening in thicker materials. They are essential for industrial construction, such as the assembly of metal structures, storage racks, and heavy machinery enclosures.
Special - Feature Dacromet Pancake Head Self - Drilling Screws:
Fine - Thread Dacromet Pancake Head Self - Drilling Screws: With a smaller thread pitch compared to standard screws, fine - thread models offer increased adjustment precision and enhanced resistance to loosening. They are commonly used in applications that require fine - tuning, such as in precision machinery installation, electronics equipment assembly, and high - end furniture manufacturing.
Self - Drilling Screws with Different Drill Tip Types: Different drill tip designs are available to suit various materials. For example, the "cutting point" tip is ideal for metal sheets, providing fast and clean drilling; the "spade point" tip is better for wood and softer materials, reducing the risk of splitting. These specialized tips ensure efficient drilling and a secure fastening in specific materials.
Manufacturing Process
The production of Dacromet pancake head self - drilling screws involves multiple precise steps and strict quality - control measures:
Material Preparation: High - quality raw materials, such as steel bars or rods, are carefully sourced. The materials are inspected for chemical composition, mechanical properties, and surface quality to ensure they meet the required production standards. Metal materials are then cut into appropriate lengths according to the screw size specifications.
Forming: Metal screws are typically formed through cold - heading or hot - forging processes. Cold - heading is commonly used for smaller - sized screws. In this process, the metal is shaped into the desired pancake - head, shank, and drill - tip form using dies in multiple stages. This method is efficient for high - volume production and can create accurate thread forms and screw shapes. Hot - forging is applied to larger or higher - strength screws, where the metal is heated to a malleable state and then shaped under high pressure to achieve the required strength and dimensional accuracy.
Threading: After forming, the screws undergo threading operations. Thread rolling is a preferred method as it creates a stronger thread by cold - working the metal, improving the fatigue resistance of the screw. Specialized threading dies are used to ensure the thread pitch accuracy and compatibility with different materials. For self - drilling screws, the thread design is optimized to enhance the self - drilling and self - tapping performance.
Drill Tip Machining: The self - drilling tip is a crucial part and requires precise machining. Specialized cutting tools and grinding machines are used to shape the drill tip with the correct angle, edge sharpness, and geometry. This ensures that the screw can effectively penetrate the material and start the drilling process smoothly without excessive force or damage to the screw.
Heat Treatment (for carbon steel and alloy steel screws): Metal screws, especially those made from carbon steel or alloy steel, may undergo heat - treatment processes. Annealing is used to relieve internal stresses, quenching increases hardness, and tempering restores some ductility and improves toughness. These processes optimize the mechanical properties of the screws to meet the specific application requirements.
Surface Treatment Process
The defining feature of Dacromet pancake head self - drilling screws is their Dacromet surface treatment. Dacromet is a high - performance anti - corrosion coating system. The process begins with cleaning the screw surface thoroughly to remove any contaminants, oil, or rust. Then, the screws are immersed in a Dacromet solution, which consists of zinc flakes, aluminum flakes, chromates, and binders. After immersion, the screws are subjected to a drying process to evaporate the solvent in the solution. Subsequently, they are cured at a high temperature, usually around 300°C. During the curing process, a dense, uniform, and adherent coating is formed on the screw surface. This Dacromet coating provides excellent corrosion resistance, far superior to traditional zinc plating. It can withstand hundreds of hours of salt - spray testing, protecting the screw from rust and corrosion in harsh environments. Additionally, the Dacromet coating has good heat resistance, lubricity, and non - conductivity properties, enhancing the overall performance and service life of the screws.
Application Scope
Dacromet pancake head self - drilling screws are widely used across multiple industries and applications:
Construction Industry: In construction, these screws are extensively used for fastening metal roofing sheets, wall panels, and other building components. Their self - drilling feature eliminates the need for pre - drilling holes, improving construction efficiency. The Dacromet coating ensures long - term corrosion resistance, making them suitable for both indoor and outdoor construction projects. They are also used in the installation of insulation materials, drywall, and exterior siding.
Automotive and Transportation: In the automotive industry, Dacromet screws are used for assembling vehicle body panels, interior trim, and securing various components. Their excellent corrosion resistance and reliable fastening make them suitable for automotive manufacturing and repair. In the transportation sector, they are also used in the assembly of trucks, trailers, trains, and buses, ensuring the stability and integrity of the structures.
Industrial Equipment Manufacturing: In industrial settings, these screws are essential for installing and maintaining machinery, equipment enclosures, and conveyor systems. Heavy - duty models can withstand the high loads and vibrations in industrial environments, ensuring the long - term operation of the equipment. The Dacromet coating protects the screws from industrial pollutants and chemicals, extending their service life.
Furniture and Woodworking: Although mainly designed for metal applications, some models are suitable for wood and composite materials. In furniture making and woodworking, they can be used for quick assembly, especially for parts that require a stronger connection than traditional wood screws. The pancake - head design provides a large bearing surface, preventing damage to the material and ensuring a stable connection.
Renovation and DIY Projects: Dacromet pancake head self - drilling screws are popular among DIY enthusiasts and renovation workers. Their simplicity, efficiency, and corrosion resistance make them ideal for home improvement tasks, such as installing shelves, fixing metal fixtures, and making repairs around the house. They are easy to use with common tools, reducing the skill level required for various projects.
Product Advantages
Superior Corrosion Resistance: The Dacromet coating on these screws offers outstanding corrosion resistance, far exceeding that of conventional surface treatments. This makes them suitable for use in harsh environments, such as coastal areas, industrial zones with high pollution, and outdoor applications exposed to moisture and chemicals, ensuring long - term reliability and durability.
Efficient Self - Drilling: The self - drilling feature of these screws eliminates the time - consuming and labor - intensive process of pre - drilling holes. This significantly improves installation efficiency, whether in large - scale construction projects or small DIY tasks, reducing overall working time and labor costs.
Large Bearing Surface: The pancake - head design provides a larger bearing surface, which distributes pressure more evenly when tightened. This helps prevent damage to the material being fastened, especially in softer materials like wood or plastic, and provides a more stable connection, enhancing the structural integrity of the assembly.
Versatility: Available in a wide range of materials, sizes, and designs, Dacromet pancake head self - drilling screws can be used in various materials, including metal, wood, and composite materials. Different drill tip types and thread designs allow them to adapt to specific material characteristics, providing a versatile fastening solution for multiple applications across different industries.
High - Temperature and Chemical Resistance: The Dacromet coating gives the screws good heat - resistance and chemical - resistance properties. This enables them to maintain their performance in high - temperature environments and resist the corrosion caused by exposure to chemicals, making them suitable for a broader range of industrial and outdoor applications.
Aesthetically Pleasing: The smooth and uniform appearance of the Dacromet - coated screws can also contribute to the aesthetic appeal of the final product, especially in applications where the appearance of the fastening components matters, such as in furniture making and architectural projects.
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