Grade 12.9 Galvanized Hex Socket Countersunk Head Cap Screws

The core value of Galvanized Hex Socket Countersunk Head Cap Screws comes from its 90° countersunk head design. After proper installation, the top surface of the screw head is perfectly flush with the workpiece surface, eliminating any protrusions, preventing interference with other moving parts or coverings, and ensuring a neat and smooth appearance, especially in installation scenarios with limited space. Combined with the reliable high-torque installation, good guidance, a wide range of specifications and high-strength material grades provided by the hexagonal drive, Galvanized Hex Socket Countersunk Head Cap Screws has become an ideal fastening solution for precision machinery, industrial equipment and high-end products that require absolutely flat surfaces, save axial space and ensure connection reliability.

Parameter (Specification)

Feature And Application

• Various thread sizes available, including from M3 to M10

• Made of galvanized surface treatment

• Used in applications where a wider head and lower profile is required

• 12.9 grade high tensile steel as standard

Galvanized Hex Socket Countersunk Head Cap Screws have become a key solution in areas that require flush installation and resistance to environmental corrosion due to the spatial advantages of their 90° countersunk head and the anti-corrosion properties of the zinc coating. Its core applications focus on thin-walled structures exposed to humid, rainy or mildly chemical environments: in the field of outdoor infrastructure, it is widely used in the connection of transportation facilities, power equipment and fencing systems. The galvanized layer can effectively resist rain, moisture and industrial atmospheric corrosion. At the same time, the 90° countersunk head design ensures that there are no protrusions in the fastening parts, avoids the risk of hooking and maintains the streamlined structure. In summary, Galvanized Hex Socket Countersunk Head Cap Screws have established an optimal balance between anti-corrosion requirements, space constraints and cost-effectiveness.

Details

The electro galvanizing process of Galvanized Hex Socket Countersunk Head Cap Screws deposits the zinc layer at low temperature through electric current, which can accurately control the coating thickness, smooth the surface and make the appearance more beautiful; it has little effect on the mechanical properties of the substrate and is not prone to hydrogen embrittlement; at the same time, it does not change the size of the workpiece and is suitable for thin plates, small parts and parts that need to be bent, stamped or sprayed later. However, hot-dip galvanizing has a thicker coating and stronger corrosion resistance, but the surface is rough. The high temperature process may affect the material properties and there is a risk of dimensional deformation. Therefore, electro galvanizing has more advantages in fields that require high precision and good appearance, such as light industry, electronics, and automotive precision parts.

The core advantage of Grade 12.9 Galvanized Hex Socket Countersunk Head Cap Screws is that they meet the requirements of both ultra-high strength and efficient load-bearing in compact space: their 12.9-grade strength provides an ultimate load capacity far exceeding that of ordinary stainless steel screws, and is particularly suitable for heavy loads, shock or vibration environments; and the countersunk head design unique to the DIN 7991 standard enables flush installation with the surface of the connector, saving space and avoiding interference. Combined with the hexagonal drive structure, high preload locking can be achieved in a small space, making it an ideal choice for high-strength thin-walled structure connections in heavy machinery and precision equipment.