A hexagon socket bolt (cap bolt) with a flat top and a conical seat. Also called countersunk cap (countersunk cap) or countersunk bolt. Used when you do not want the head of the screw to protrude, and it is necessary to counterbore the material to be tightened. The finish is smooth and less likely to damage the skin, increasing safety. Because the screw head is inconspicuous, it is also used in products where design is important. Like countersunk screws, they are also used for hinges, but because they can be tightened with a hex wrench, they can be used for large equipment or parts that need to be securely fastened.
Hexagonal wrenches (hexagonal wrench keys) used with hexagon socket head bolts (cap bolts) require less space when tightening, so they are suitable for working in narrow spaces that are difficult to use with spanners and wrenches. Even when fastening is required at multiple locations in close proximity, it is possible to downsize the device by saving space without worrying about interference with neighboring bolts. Since you can only use a hexagonal wrench that matches the size of the hexagonal hole, you can exert strong tightening force without damaging the head hole. Although hexagon socket head bolts are treated as bolts, they are often used without being assembled with nuts.
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