Hexagon socket set screw is a kind of full thread screw. As shown in the figure, one end of it is used on the connected parts. It is a kind of hole screw. The diameter of metric screw in the national standard is generally M2 ~ M12 and the length of screw is 6mm ~ 100mm. Hexagon socket set screw is generally used to fix the relative position of two parts with weak force. Common parts such as KIT Parts and positioning set screws have many kinds, According to the end part, it can be divided into conical end, flat end, concave end and oblong stigma. Conical end screws are generally applicable to parts with low strength, and non sharp conical end screws are applicable to parts with pits on the compression surface to increase the ability of transmitting load. Flat end screws (the pressing surface shall be flat) and concave end screws are applicable to mechanical parts with high hardness or frequently adjusted position; The long cylindrical end screw is applicable to the tubular shaft (thin-walled parts). The cylindrical end enters the hole of the tubular shaft to transfer large load, but there should be a device to prevent the screw from loosening when using.
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