The internal hexagon screw features a round outer head with a concave hexagonal center. This structure can bear greater loads. It has six load-bearing surfaces, making it more resistant to twisting than the single-slot and cruciform screws, which only have two surfaces.

Note: The material of internal hexagon bolts is generally made of stainless steel, carbon steel, or alloy steel, which is basically indistinguishable from the material of other types of screws. The higher the performance grade, the greater the strength. When selecting screws, it is essential to choose the appropriate performance grade strictly according to the usage requirements. Different grades have different prices.

2. Can be processed with full immersion. The entire bolt is submerged into the workpiece, thereby maintaining the flatness and aesthetic appearance of the workpiece surface.

3. Easy Installation: Compared to external hex screws, internal hex sockets are suitable for more assembly situations, especially in narrow spaces. Therefore, they are convenient for assembly and maintenance, as well as for adjustment.

4. Not easily removable. The tools we commonly use include adjustable wrenches, screwdrivers, and sockets, but removing the internal hex bolt requires a specialized wrench. Therefore, it's not easy for most people to dismantle, which is also a benefit.