Ways of using hexagon socket countersunk head screws

Head screws are mostly used after installation, where the surface of the parts cannot be raised, and the fastened parts have two thicknesses. The so-called thick means that the thickness of the fastened part is greater than the thickness of the head of the countersunk screw. , After the screw is tightened, there is still a part of the screw thread that does not enter the threaded hole. In this case, the countersunk screw can definitely be tightened. There is usually another situation, that is, the thickness of the fastened parts is less than the height of the head of the countersunk screw, which is common in sheet metal parts in mechanical equipment, such as the connection of the hinge of the chassis and the door and the box; the sheet metal of the equipment The connection between the cover and the equipment, etc. Due to the small thickness of the part, the screw through hole of the fastened sheet metal part has become a conical hole completely. In this case, when the countersunk screw is tightened, the screw head is not a conical surface to compress the sheet metal part. , But the bottom of the screw head and the top of the threaded hole are squeezed. Although the screw feels that the screw is tightened, the sheet metal part is stuck instead of being pressed. In this case, although the screw feels that the screw is tightened, the sheet metal The gold piece is indeed not tightened. This is a very common situation.