DIN 933 bolts are mostly used where the surface of th […]
DIN 933 bolts are mostly used where the surface of the part cannot be raised after installation, and there are two types of the thickness of the fastened parts. The so-called thick means that the thickness of the fastener parts is greater than that of the head of the DIN 933 bolt. Thickness, after the screw is tightened, a part of the screw thread still does not enter the threaded hole. In this case, DIN 933 bolts can certainly be tightened.
There is usually another situation where the thickness of the fastener part is less than the height of the DIN 933 bolt head, which is common to sheet metal parts in machinery and equipment, such as the hinge of the chassis and the connection of the door and the box; sheet metal of the device Connection of housing to equipment, etc.
Due to the small thickness of the parts, the screw vias of the fastened sheet metal parts completely becomes a conical hole. In this case, when DIN 933 bolts are tightened, the screw head are not a tapered surface to press the sheet metal parts. , But the bottom of the screw head root and the top of the threaded hole is squeezed to death. Although the screw feels tightened, the sheet metal is stuck instead of being pressed. In this case, although the screw is tightened, the sheet The gold pieces was indeed not tightened. This is a very common situation.