- ZHUHAI JIALI HARDWARE CO.,LTD.
- +86-756-8586520
Set screw with concave end ASME b18.3
- Product description：Also known as hexagonal concave end machine, belongs to fastener products. It has no head, positive inner hexagon groove and concave end at the tail of the screw. It needs to be installed and used wit
Set screw with concave end ASME b18.3
Material: stainless steel 304316, grade 8.8 high strength and grade 12.9 high strength
Product standard: ASME b18.3
It can also support non-standard customization.
In the family of fasteners, the hexagon socket cup-point set screw (also known as Grub screw) is a product with precise positioning and exquisite design. It not only meets the core needs of mechanical connection in terms of function, but also enhances the appearance of the connected components, making it an "invisible hero" in precision manufacturing and high-end assembly scenarios. As an important category of set screws (also called jackscrews), its core value lies in fixing the relative position of two components, fundamentally preventing relative sliding or rotation of the components during operation, and laying a solid foundation for the stable operation of equipment.
From the perspective of structural design, the three major features of the hexagon socket cup-point set screw are closely linked, which not only ensure the convenience of installation but also enhance the reliability of fastening. The first is the "headless design". This design breaks the shape limitation of traditional fasteners with heads (such as hexagon head screws and pan head screws) — the absence of a protruding head means that it can be completely embedded in the threaded hole of the connected component, and almost no trace of the fastener can be seen on the surface after installation. This "invisible installation" not only keeps the surface of the component flat but also avoids the scratch risk caused by the protruding head. It is especially suitable for scenarios with high requirements for surface flatness, such as the shell assembly of precision instruments and the fixing of connectors for high-end furniture, without worrying that the protruding screw head will affect the hand feel or appearance.
The second is the design of the "regular internal hexagon slot". This structure directly solves the problem of easy slipping when installing ordinary screws. The internal hexagon slot is opened at one end of the component, and its size follows standard specifications. It can only be operated with a hexagon wrench (such as hex key, Allen Wrench) of the same model. Compared with ordinary slotted or Phillips screws, the internal hexagon slot has a higher fit with the wrench, which is not easy to slip when applying force. This not only reduces damage to the screw slot but also allows installers to control the tightening force more accurately. This advantage is more obvious especially in narrow spaces or scenarios requiring high-strength fastening. For example, in the fixing of automotive interior components, the hexagon wrench can easily apply force in the narrow installation space to ensure that the screw is tightened in place.
The last is the detailed design of the "cup-point tail", which is the key to improving the fastening effect. The tail of the screw is in the shape of a concave arc or cone. When it comes into contact with the fixed component, it can form a tighter fitting surface. When used to hold shaft or sleeve components tightly, the cup-point tail can better "grip" the surface of the component, increase the contact friction force, and avoid loosening caused by equipment vibration. At the same time, the concave structure can also reduce the pressure on the surface of the connected component, preventing scratches or deformation caused by hard contact. For example, in the connection between the motor shaft and the gear, the cup-point set screw can not only firmly fix the position of the gear but also not damage the surface of the shaft, ensuring the service life of the component.
In terms of application advantages, the "headless design" of the hexagon socket cup-point set screw is undoubtedly the biggest highlight, making it stand out among many fasteners. For products that focus on appearance texture, such as high-end wooden furniture, using it to fix the table legs and the panel, no screw traces can be seen on the surface, maintaining the integrity and aesthetics of the wood grain. In the field of precision instruments, such as the fixing of lens components of optical equipment, the flat surface can avoid interference with light refraction and prevent protruding components from affecting the precise operation of the instrument. In automotive interiors, from the instrument panel to the door trim panel, the invisible installation of the hexagon socket cup-point set screw makes the overall interior more concise and high-end, enhancing the visual experience of the driver and passengers.
In addition, its practicality is also reflected in the wide range of applicable scenarios. Whether it is mechanical components that need to operate at high frequency or civil products that pursue delicate texture, the hexagon socket cup-point set screw can meet different needs with its stable fastening performance and low-key appearance design. It does not have a complex structure, but through the optimization of the three core details of "headless", "internal hexagon slot" and "cup-point", it balances function and aesthetics, becoming a typical representative of "small but exquisite" in the field of fasteners, and providing strong support for the reliable assembly and high-end presentation of various products.
