A Countersink icon

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A Countersink (sign: ⌵) is a conelike opening reduced into a produced things, or the cutter utilized to reduce such a hole. A common use is to enable the head of a countersunk bolt, screw or secure, when placed in the hole, to sit flush with or below the surface area of the surrounding product (comparative, a counterbore makes a flat-bottomed hole that could be used with a socket-head capscrew). A countersink may also be utilized to remove the burr left from a boring or tapping operation consequently improving the coating of the product and also getting rid of any type of harmful sharp sides.

hardware hand tools of a countersink (cutter) naturally can be related to the plunging applications defined above (axial feed just) as well as additionally to other milling applications (laterally traversal). Therefore, countersinks overlap in kind, feature, and in some cases name with chamfering endmills (endmills with angled suggestions). Despite the name offered to the cutter, the surface area being created might be a conical chamfer (plunging applications) or a diagonal corner for the intersection of 2 airplanes (passing through applications).