Grade 10.9 high-strength black countersunk hexagon socket screws M2/M3/M4/M5 flat-head screws and bolts M6/M8/M10/M12

The core advantages of Grade 10.9 high-strength countersunk hexagon socket screws are "ultra-high fastening strength, flat and concealed countersunk head, precise drive of the hexagon socket, and adaptability to heavy-load scenarios",

1. With a high strength of 10.9 grade, it boasts excellent torsion and shear resistance. Made of medium carbon steel or alloy steel, after quenching and tempering heat treatment, its tensile strength can reach 1000MPa and yield strength can reach 900MPa, which is more than 1.2 times that of ordinary 8.8 grade screws. It can withstand the impact load, continuous vibration, and high shear force of heavy equipment (such as machine tool fixtures, mold pressing plates, and steel structure connections). The high strength characteristic can prevent screws from breaking and deforming under heavy load conditions, making it suitable for industrial machinery, construction machinery, and other scenarios where the strength of fasteners is strictly required.
2. The countersunk head structure is flat and concealed without interference. The head is designed as a conical countersunk head, which can be fully embedded into the counterbore of the workpiece after tightening, flush with the surface of the workpiece, without any protruding parts.
   It will not scratch operators or moving parts of equipment (such as sliders and conveyor belts), ensuring high safety;
   When exposed, it presents a visually neat appearance, making it suitable for assembly scenarios that require surface flatness, such as decorative panels and precision equipment casings;
   The mating surface between the countersunk head and the counterbore can distribute pressure, further enhancing the stability of fastening.
3. Hexagonal drive, precise torque transmission and anti-slip The fit between the hexagonal slot and the wrench is over 90%, enabling efficient transmission of high torque without slipping or wear (i.e., "slip wrench") during disassembly and assembly. Compared to Phillips and slotted screws, it is more suitable for precision assembly scenarios that require precise control of tightening force. At the same time, the hexagonal slot is hidden in the head, preventing dust and oil from entering, extending the service life of the screw. In addition, an extended hexagonal wrench can be easily used to apply force in narrow spaces.

Shenzhen Huayuanxing Precision Hardware Co., Ltd. is a manufacturer specializing in the development, production, and sales of screw fasteners, with 20 years of industry experience. Huayuanxing screws are characterized by precision, miniaturization, and firmness. The company's existing factory covers an area of over 8,000 square meters, with a finished product warehouse of over 4,000 square meters and a stock inventory of over 3,000 tons. It has successively introduced more than 250 precision production equipment, including cold heading machines, thread rolling machines, and thread milling machines, capable of producing small screws with an outer diameter of 1mm and a length of 3mm, with an average daily production capacity of up to 20 million pieces. Huayuanxing has complete inspection equipment, including salt spray testing machines and 2D imaging detectors. It currently employs more than 50 people, including 8 engineering and technical personnel with 20 years of industry experience