- ZHUHAI JIALI HARDWARE CO.,LTD.
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Pan torx head screw
- Product description：Pan head inner plum blossom machine wire-gb2672
Pan head inner plum blossom machine wire-gb2672
Material: 1022 / SUS304 / SUS316
It can also support non-standard customization.
In fields such as electronic equipment, precision instruments, and home furnishing manufacturing, the requirements for screws in terms of "precision", "anti-loosening performance", and "appearance" are increasingly high. As a specialized fastener complying with Chinese National Standards, the pan-head inner hexagon machine screw - GB2672, with its composite advantages of "aesthetic pan head + inner hexagon anti-loosening + machine thread adaptability", has become an ideal choice that balances fastening reliability and operational convenience. It is widely used in scenarios with strict requirements for details, providing standardized support for the stable assembly of various products.
I. Product Definition: A Precision Fastener Under National Standard Specifications
The pan-head inner hexagon machine screw - GB2672 is a machine screw produced in accordance with the GB2672 national standard. Its core features can be broken down into three parts: the "pan head" refers to the screw head with a circular protrusion (arc top + flat bottom), which has a large contact area with the surface of the connected component. After installation, it presents a visually flat appearance, avoiding scratches or appearance impacts caused by sharp edges; the "inner hexagon" means the groove on the head is hexagon-shaped (usually 6-lobed or 12-lobed). Compared with traditional inner hexagonal grooves, it has a larger contact area and more uniform force distribution. Moreover, it requires a dedicated hexagon wrench for disassembly and assembly, which can effectively prevent incorrect operation by non-professionals or malicious disassembly; the "machine thread" indicates that the screw shank is processed with machine threads (ordinary coarse threads or fine threads), which are compatible with prefabricated internal threaded holes. It can be directly screwed in to complete fastening without self-tapping and drilling, and is suitable for various hard connectors such as metal and plastic.
Compared with ordinary pan-head inner hexagonal screws, its core advantages lie in "anti-loosening and anti-misdisassembly": the multi-lobed structure of the inner hexagon groove enables a tighter fit between the wrench and the screw, preventing slippage during force application. Especially in vibrating environments, its anti-loosening effect is better than that of inner hexagonal screws; at the same time, the requirement for a dedicated hexagon wrench avoids screw damage or component failures caused by non-professional operations in after-sales maintenance or public equipment scenarios.
II. Standard Specifications: Core Technical Requirements of GB2672
As the exclusive national standard for pan-head inner hexagon machine screws, GB2672 has strict regulations on dimensional accuracy, mechanical properties, and surface treatment to ensure the versatility and reliability of the product:
- Dimensional Accuracy: Centered on the nominal diameter of the screw (common specifications: M1.6-M10), it specifies key parameters such as head diameter, thickness, and hexagon groove depth. For example, for an M3 specification screw, the head diameter tolerance is ±0.1mm, and the hexagon groove depth must be ≥1.2mm to ensure stable fitting of the wrench; the thread accuracy of the shank is grade 6g, which is compatible with corresponding internal threaded holes and ensures no jamming during screwing.
- Mechanical Properties: Grades are divided according to different materials. For instance, carbon steel materials must reach grade 4.8 (tensile strength ≥400MPa), and stainless steel materials (such as 304) must meet the requirement of tensile strength ≥500MPa, ensuring the screw does not break or strip under normal loads; meanwhile, it requires sufficient connection strength between the head and the shank, and the head must not fall off during torque testing.
- Surface Treatment: The national standard recommends surface treatment methods such as galvanizing (color zinc, white zinc), passivation, and black oxide coating. Among them, the galvanized layer thickness must be ≥5μm, and it must pass a 48-hour salt spray test without rusting, making it suitable for humid or outdoor environments; passivation treatment is applicable to stainless steel materials, further improving corrosion resistance to meet hygiene requirements for medical equipment and food equipment.
These specifications enable pan-head inner hexagon machine screws - GB2672 produced by different manufacturers to be interchangeable, reducing supply chain costs and providing a clear basis for user selection.
III. Structural Advantages: Balancing Practicality and Safety
The structural design of the pan-head inner hexagon machine screw - GB2672 focuses on "ease of use" and "safety", with two particularly prominent highlights:
First, the appearance and protection of the pan head: The circular head has no sharp edges, and after installation, it transitions smoothly with the surface of the connected component. This not only prevents scratches to operators or clothing but also enhances the overall aesthetics of the product. It is especially suitable for scenarios with high requirements for appearance and safety, such as home appliance panels and children's toys; at the same time, a flat washer can be added under the head to further distribute pressure and protect easily deformable materials such as plastic and thin metal.
Second, the anti-loosening and anti-disassembly of the inner hexagon groove: The multi-contact design of the hexagon-shaped groove allows the torque applied by the wrench to be evenly transmitted to the screw, reducing local stress concentration and lowering the probability of thread stripping; compared with cross or slotted grooves, the inner hexagon groove is less likely to wear due to long-term use, resulting in a longer service life; in addition, the compatibility with a dedicated wrench prevents malicious disassembly of screws in public equipment (such as charging piles and subway interiors), ensuring the safety of the equipment.
IV. Application Scenarios: Focusing on Precision and Safety Requirements
With its standardized design and structural advantages, the pan-head inner hexagon machine screw - GB2672 plays an important role in multiple fields:
- Electronics and Precision Instruments: For fixing mobile phone motherboards and laptop casings, M2-M3 specification screws are commonly used. The anti-loosening property of the inner hexagon groove can resist vibration during equipment transportation and prevent component loosening; the pan-head design does not affect the flatness of the equipment shell, meeting the lightweight and thin requirements of electronic products.
- Home Appliances and Home Furnishings: For connecting washing machine control panels and oven doors, galvanized carbon steel screws are selected, which can withstand humid or high-temperature environments. Meanwhile, the anti-disassembly feature of the inner hexagon prevents users from mistakenly disassembling internal circuits; in the furniture field, for fixing drawer slides and cabinet door hinges, the pan head can be hidden in accessories without affecting the appearance of the furniture.
- Medical Equipment and Public Equipment: For medical equipment such as sphygmomanometers and blood glucose meters, Stainless steel screws are used. After passivation treatment, they have no rust risk and meet hygiene standards; for public equipment such as charging piles and vending machines, the anti-disassembly design of the inner hexagon can prevent component theft and ensure the normal operation of the equipment.
V. Usage Precautions
Three points should be noted during use: first, select a hexagon wrench of the appropriate specification to avoid forced twisting with an inappropriate tool, which may damage the groove; second, control the tightening torque according to the material of the connected component. For example, for plastic parts, a torque wrench should be used to set a low torque (e.g., ≤3N・m for M3 screws) to prevent cracking of the component; third, in humid environments, prioritize galvanized or stainless steel materials and use them with flat washers to improve corrosion resistance and anti-loosening effects.
As a precision fastener under national standard specifications, the pan-head inner hexagon machine screw - GB2672, with its characteristics of "standardization, anti-loosening, and aesthetics", has become a fastening solution that balances practicality and safety. Whether for the precision assembly of electronic equipment or the safe fixing of public facilities, it can meet requirements with reliable performance and is an indispensable standardized component in industrial production and daily life.
