Grade 10.9 black half-round head hexagon socket screws M2/M3/M4, bolts M6/M8, and high-strength bolts M10/M12

The core advantages of black high-strength hexagon socket screws are "high torsional strength, corrosion resistance and rust prevention, concealed and aesthetic appearance, and precise fastening",

1. High-strength material with outstanding torsion and shear resistance. These screw base materials are mostly 8.8 grade, 10.9 grade, or 12.9 grade high-strength carbon steel. After quenching and tempering heat treatment, their tensile, torsional, and shear resistance far exceed that of ordinary carbon steel screws. They can withstand the impact load and continuous vibration of heavy equipment (such as construction machinery, mold pressing plates, and steel structure fixation). The hexagonal drive structure can transmit greater torque, making it less likely for screws to break or slip during tightening, and suitable for high-load fastening scenarios.
2. Black surface treatment, dual protection + concealed and aesthetically pleasing appearance. Typically, black oxidation, electrophoretic blackening, or black galvanizing treatments are applied to form a dense protective film: corrosion and rust resistance: it isolates air and moisture. In indoor dry and mildly humid environments, its rust-proof performance is 2-3 times higher than that of uncoated high-strength screws, preventing fastening loosening due to rust; concealed and aesthetically pleasing: matte/glossy black can blend into dark equipment casings, steel structures, wooden furniture, and other assembly surfaces, providing strong visual coordination when exposed. It is suitable for scenarios where appearance cleanliness is required (such as black chassis, outdoor dark guardrails).
3. Hexagonal drive, precision and efficiency + high safety The hexagonal slot fits tightly with the wrench, ensuring precise torque transmission and preventing slipping and damage to the slot during assembly and disassembly; the slot is hidden on the screw head, with no exposed edges or corners after tightening, thus avoiding scratching operators or precision components inside the equipment (such as motor rotors and instrument casings); in confined spaces, extended hexagonal wrenches can be used to easily apply force, suitable for complex assembly scenarios such as inside equipment and dense fasteners.

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.