The head of the hexagonal socket bolt is eccentric or skewed, which may cause serious problems. For example, from the appearance of the product, it is not aesthetically pleasing overall. Another issue is the eccentricity, which can easily cause the production tool to break easily. The most serious problem can also lead to a series of problems such as broken heads of hexagonal bolts.

Drill holes according to the diameter of the inner hexagon to meet the requirements.

Use a cold heading machine to upset the hexagonal socket screws. A single piece can be punched with a hexagonal punch and hammered out. Similar to countersunk screws, the head of the screw is embedded in the machine and has a high connection strength, but the screw must be installed and removed using a corresponding hexagonal wrench. Generally used on various machine tools and their accessories.