2h Heavy Hex Nuts Manufacturer Introduces What Is A Countersunk

  •  


    The countersunk head screws are mostly used after installation, the surface of the parts can not be raised, and the fastened parts have two thicknesses, the so-called thick, which means that the thickness of the fastened part is greater than the thickness of the head of the countersunk screw Thickness. 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 is completely a conical hole. 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.


    2H Heavy Hex Nuts Manufacturer introduced the reasons for the processing: the head cone of the countersunk screw has a cone angle of 90°. Usually the top angle of the newly purchased drill bit is 118°-120°. Some workers who lack training do not know it. This angle difference is often used directly to ream the hole with a 120° drill bit, which results in that when the countersunk screw is tightened, it is not the conical surface of the head that is difficult, but the line at the bottom of the screw head is difficult, which is also the so-called countersunk screw cannot One of the reasons.


    Through the above introduction, Heavy Hex Bolt Manufacturer hopes that you can simply refer to the content of this article in future use.


     

40 views