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Torx Flat Oval head screw

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Torx machine screw

  • Torx Flat Oval head screw
  • Torx Flat Oval head screw
Torx Flat Oval head screw
  • Description：In the field of fasteners, "requiring both surface flatness, convenient installation and reliable connection" is a core demand in many scenarios. Relying on its unique semi-countersunk head design, th
I. Structural Design: Semi-Countersunk Feature, Balancing Flatness and Practicality
The core highlight of the half-countersunk-head inner plum blossom machine screw lies in its "semi-countersunk" head structure — the upper part of the head is cylindrical, and the lower part is conical. When matched with the semi-countersunk hole of the connected part, the head only slightly protrudes (the protrusion height usually does not exceed 0.3-0.8mm, depending on specifications). This design not only avoids the obtrusiveness caused by the obvious protrusion of pan-head screws but also does not rely on countersunk holes with precise depth like countersunk-head screws, reducing processing difficulty and installation error tolerance.
This design is particularly practical in furniture assembly, such as the connection between the tabletop and legs of a wooden desk: if pan-head screws are used, the protruding heads are likely to scratch clothes or affect the use of the tabletop; if countersunk-head screws are used, deeper countersunk holes need to be processed in the wood, and improper depth control may easily lead to "over-sinking" of screws or wood cracking; however, the semi-countersunk structure of the half-countersunk-head screw only requires shallow semi-countersunk holes to achieve a slightly protruding installation effect. It not only ensures the basic flatness of the tabletop but also reduces the difficulty of wood processing. Even if there is a slight error during installation, it will not affect the overall use and appearance.
At the same time, the edges of the half-countersunk head adopt a smooth transition design. Compared with the sharp edges of traditional pan-head screws, it can effectively reduce the risk of scratching the human body or objects. In the field of children's furniture, such as the connection of door panels of children's wardrobes, the smooth edges of the half-countersunk-head screw can prevent children from being scratched by the screw heads when opening or closing the cabinet doors, improving the safety of use; in the fixation of metal brackets of fabric sofas, the slightly protruding half-countersunk head will not break the sofa fabric, balancing the fastening needs and fabric protection.
The combination of the inner plum blossom slot further enhances the practical value of the semi-countersunk structure. The multi-point engagement between the inner plum blossom slot and the dedicated wrench can ensure stable torque transmission during installation, avoiding the problem of uneven force caused by the "semi-countersunk" head. In the installation of home appliance shells, such as the fixation of washing machine control panels, operators need to quickly fasten multiple screws in a narrow space. The inner plum blossom slot design of the half-countersunk-head screw can prevent wrench slipping, ensure consistent fastening force for each screw, avoid deformation or loosening of the panel due to uneven force, and ensure the flat appearance and stable use of home appliances.
II. Materials & Surface Treatment: Adapting to Scenarios, Balancing Performance and Aesthetics
The material selection of the half-countersunk-head inner plum blossom machine screw is based on "scenario requirements". The mainstream materials include stainless steel, carbon steel, and galvanized steel, which are matched with diversified surface treatments to achieve dual adaptation of performance and aesthetics.
Stainless steel (mainly 304 and 201) has become the first choice for humid or daily scenarios due to its corrosion resistance and medium strength. In the fixation of drawer slides of kitchen cabinets, the kitchen environment is humid and prone to oil contamination. The 304 stainless steel half-countersunk-head screw can resist the erosion of moisture and oil, maintain fastening performance for a long time, and the metallic luster of stainless steel is consistent with the hardware of the cabinet. The slightly protruding head will not damage the overall appearance of the slide; 201 stainless steel is suitable for dry indoor scenarios, such as the fixation of partitions of bedroom wardrobes. While ensuring basic corrosion resistance, it reduces costs and meets the demand for cost-effectiveness.
After modulation treatment, the strength of carbon steel is significantly improved (hardness can reach HRC 30-40), making it suitable for industrial scenarios with certain strength requirements. For example, in the connection of shells of small mechanical equipment, the vibration generated during equipment operation puts forward requirements for the strength of fasteners. The carbon steel half-countersunk-head screw can bear the vibration load, ensure the shell fits tightly, and the semi-countersunk structure will not affect the layout of ventilation or heat dissipation holes on the equipment shell; however, carbon steel has weak corrosion resistance and needs to be used with surface treatments such as galvanizing and nickel plating to extend its service life.
Surface treatment processes balance "performance enhancement" and "aesthetic adaptation". Silver nickel plating is the mainstream choice. The nickel plating layer can not only improve the gloss of the screw surface, making it suitable for the metallic texture of home appliances and furniture but also enhance corrosion resistance. For example, in the fixation of the panel of air conditioning outdoor units, the nickel-plated half-countersunk-head screw can resist slight rain erosion outdoors and maintain a bright appearance; black zinc treatment is suitable for industrial equipment or dark furniture. For example, in the connection of door panels of black metal filing cabinets, the black appearance of the black zinc half-countersunk-head screw is consistent with the color of the cabinet. The slightly protruding head is integrated into the cabinet design, hardly affecting the overall visual effect. At the same time, the wear resistance of the black zinc layer can cope with the friction caused by frequent opening and closing of the cabinet door; blue-white zinc treatment is suitable for ordinary scenarios with high cost-effectiveness. For example, in the fixation of office equipment cabinets, the corrosion resistance of the blue-white zinc layer meets the needs of dry indoor environments, and its cost is lower than that of nickel plating, making it suitable for mass use.
III. Scenario Application: Multi-Field Adaptation, Flexibly Solving Fastening Needs
The "semi-countersunk" feature of the half-countersunk-head inner plum blossom machine screw enables it to show flexible adaptability in multiple fields, exerting unique advantages from daily home use to industrial manufacturing.
In the field of home appliance manufacturing, in addition to washing machines and air conditioners, the connection between the inner tank and shell of refrigerators also relies on half-countersunk-head screws. The inner tank of the refrigerator is mostly made of plastic. If countersunk-head screws are used, too deep countersunk holes are likely to cause plastic cracking; if pan-head screws are used, the protruding heads will affect the fit between the inner tank and the shell, increasing energy consumption; however, the slightly protruding design of the half-countersunk-head screw can not only ensure the tight connection between the inner tank and the shell but also not cause excessive extrusion to the plastic inner tank. At the same time, the anti-slip design of the inner plum blossom slot can avoid damaging the plastic material during installation, ensuring the sealing and energy-saving performance of the refrigerator.
In the field of automotive interiors, the half-countersunk-head inner plum blossom machine screw is a core fastener for instrument panels and door panel decorative parts. The automotive interior has high requirements for surface flatness. The protrusion of pan-head screws will damage the overall texture of the interior, and countersunk-head screws require precise countersunk holes to be processed on plastic interior parts, increasing manufacturing costs; the semi-countersunk structure of the half-countersunk-head screw only requires shallow processing to achieve a slightly protruding effect, integrating with the curved or flat design of the interior parts. Moreover, the concealment of the inner plum blossom slot is better than that of slotted and Phillips slots, further improving the aesthetics of the interior. For example, in the fixation of the speaker cover on the car door panel, the slightly protruding half-countersunk-head screw will not affect the acoustic effect of the cover, and at the same time, it ensures that the cover does not loosen during the vibration of the car, ensuring the use experience.
In the field of medical equipment, such as the fixation of the shell of household blood pressure monitors, the advantages of the half-countersunk-head screw are also obvious. The shell of the blood pressure monitor is mostly made of ABS plastic. The semi-countersunk structure avoids the damage of countersunk-head screws to the plastic, and the slightly protruding head will not affect the hand-held feel of the equipment; the stainless steel material combined with chromium-free passivation treatment can meet the environmental protection and corrosion resistance requirements of medical equipment, avoid the corrosion of screws by sweat or disinfectants, and ensure the long-term reliable operation of the equipment.
IV. Performance Verification: Stable and Reliable, Ensuring Fastening Effect
To ensure the reliability of the half-countersunk-head inner plum blossom machine screw in use, professional institutions conduct special performance tests based on its structural characteristics. In the head compression test, vertical pressure is applied to the half-countersunk head through pressure equipment. Qualified products must withstand a pressure of more than 200N without deformation — this test simulates the extrusion scenario that may occur during the use of furniture or home appliances, ensuring that the slightly protruding head will not be damaged by external pressure; in the torque stability test, the inner plum blossom wrench is used to fasten and disassemble the screw multiple times (usually 5-10 times). The torque deviation of each fastening is required to not exceed ±5%, and there is no obvious wear on the slot, verifying the reliability of its repeated use and adapting to scenarios that require later maintenance or disassembly (such as home appliance maintenance).
In the vibration test, the sample installed with the half-countersunk-head screw is placed in a vibration environment simulating car driving or equipment operation (frequency 50-500Hz, amplitude 0.5mm). After 200 hours of vibration, the screw loosening amount needs to be controlled within 0.05mm, proving its connection stability in the vibration environment; in the temperature resistance test, the sample is placed in a temperature cycle of -30℃ to 70℃ for 300 hours. The material performance and surface coating of the screw have no obvious changes, adapting to scenarios with large temperature differences between indoor and outdoor, such as the fixation of the shell of outdoor advertising light boxes.
From the innovation of structural design to the flexible adaptation of multiple scenarios, the half-countersunk-head inner plum blossom machine screw solves the pain points of traditional screws with its "semi-countersunk" feature, becoming a model of fasteners that balances flatness, practicality, and reliability. With the advancement of manufacturing technology, the half-countersunk-head screw will further optimize the head protrusion height in the future (such as achieving a micro-protrusion of less than 0.2mm) and improve performance through material upgrading (such as using high-strength stainless steel), providing better solutions for more fields with strict requirements on fastening accuracy and appearance (such as smart wearable devices and precision instruments), and continuously expanding the application boundaries of fasteners.