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Countersunk slotted machine screw-din963
- Product description：Countersunk head screw is also called flat machine screw. Its head is a 90 degree cone, similar to the rare wood screw. Its head has tool tightening groove, and it has straight, cross, hexagon and so
Countersunk slotted machine screw-din963
Material: stainless steel 304316, grade 8.8 high strength and grade 12.9 high strength
Product standard:din963
Application scope / industry: solar energy, electrical products, machinery, sports equipment, aerospace and other fields.
Countersunk head screws (also known as flat head screws) come with a wide variety of tool-driven slot types on their heads, which can be flexibly selected based on application scenarios and tool compatibility. Common types include slotted, cross-recessed, and hexagon socket slots.
The slotted slot is the most basic type, with a straight-line slot opening that fits a flat-blade screwdriver. It features low cost and simple processing, making it suitable for scenarios with low stress requirements and no frequent disassembly needs, such as fixing simple furniture and assembling small toys. However, slotted slots are prone to "slippage" (a phenomenon where the screwdriver slips out of the slot) and are not suitable for high-torque operations.
The cross-recessed slot (e.g., PH, PO specifications) adopts a crisscross slot design, which enhances the fit between the screwdriver and the screw. It has better anti-slippage performance than slotted slots and can withstand higher torque. Widely used in home appliances, electronic devices, and automotive interiors, it is applied in scenarios like fixing washing machine casings and connecting mobile phone middle frames. Additionally, cross-head screwdrivers have strong versatility, facilitating daily maintenance.
The hexagon socket slot is the first choice for high-precision and high-torque scenarios. With a hexagonal slot opening, it requires an Allen wrench for operation. It offers an extremely tight fit, enabling effective transmission of high torque. Moreover, the hexagon socket slot is hidden within the screw head, making it less susceptible to external damage. It is suitable for scenarios with high requirements for fastening strength and safety, such as precision instruments, mechanical equipment, and areas around automotive engines, including fixing printer gears and connecting end covers of small motors.
Compared with ordinary pan head screws or round head screws, the core advantages of countersunk head screws lie in their "flatness" and "adaptability". After installation, the heads of ordinary screws protrude, which not only affects the appearance but also may cause friction with other components in vibrating environments. In contrast, countersunk head screws are fully embedded in the connected parts, avoiding these issues. Meanwhile, the cooperation between the 90° conical head of the countersunk head screw and the countersunk hole forms a "surface contact", which distributes the fastening pressure, reduces local stress concentration on the connected parts (especially soft materials like plastic and wood), and prevents material cracking. For example, when fastening plastic casings, the head pressure of ordinary screws tends to cause local deformation of the plastic, while the surface contact design of countersunk head screws can protect the plastic casings and extend their service life.
Countersunk head screws have an extremely wide range of application scenarios, covering key assembly links in various industries. In the furniture manufacturing industry, the door panels of solid wood wardrobes and the fixing of drawer slides rely on countersunk head screws to ensure the furniture surface is flat and aesthetically pleasing. In the electronic and electrical industry, small countersunk head screws are needed for the precise fastening of laptop keyboard brackets and the connection of monitor frames, to avoid affecting the slim and lightweight design of the devices. In the architectural decoration industry, countersunk head screws are commonly used to fix aluminum alloy ceiling panels and gypsum boards, ensuring seamless connection of decorative surfaces. In the mechanical equipment industry, the covers of small gearboxes and the installation of sensors also require countersunk head screws to provide flat and firm connections, ensuring the normal operation of the equipment.
When selecting and using countersunk head screws, two key points should be noted: First, the machining accuracy of the countersunk hole. It is necessary to ensure that the countersunk hole has a 90° angle and that its depth matches the height of the screw head, to prevent the screw head from failing to be fully embedded due to deviations in the hole shape. Second, material selection. The material should be adapted to the application environment: for humid environments, stainless steel countersunk head screws (304, 316 materials) are preferred for their rust and corrosion resistance; for ordinary dry environments, carbon steel countersunk head screws (45# steel, Q235 material) are suitable due to their low cost and sufficient strength; for electronic devices, brass countersunk head screws are commonly used as they possess both electrical conductivity and rust resistance.
From daily furniture to precision instruments, countersunk head screws, with their characteristic of "small components playing a major role", have become an ideal choice for scenarios pursuing flat fastening. Through their precise structural design and flexible adaptation to various slot types, they balance aesthetics, safety, and strength, providing reliable guarantees for high-quality assembly in various industries.
