A hexagon socket head bolt (cap bolt) with a lower head than JIS standards. Also called low head cap screw, low head CAP, low head CAP. It fits well even in narrow spaces where it is difficult to fasten, and is also used in products where design is important, such as mobile devices and thin devices. This bolt is suitable for tightening in narrow places where it is difficult to work with a spanner or wrench.
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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