To chamfer or form a depression around the top of (a hole in wood, metal, etc.) for the reception of the head of a screw or bolt below the surface, either wholly or in part; as, to countersink a hole for a screw.
1) a process of machining a larger chamfered hole concentric with an existing hole. The process is often used to provide a below-the-surface nesting cavity for a flat head screw. 2) any of a number of special tools designed to countersink.
A shallow angled or beveled hole that is formed to allow the head of a flathead screw or bolt to be recessed and tightened flush with the surface of the workpiece. The tool designed to produce this special hole is called a countersink.
(1) A funnel shaped enlargement at the outer end of a drilled hole having an 820 included angle to allow the head of a screw to be flush with or below the surface. (2) A bit or drill for making a countersunk hole.
The larger diameter at the entrance of a machined hole with a conical bottom. Similar to a counterbore except for the bottom configuration. The general use of a countersink is for use with flat head screws and bolts.
The action of using a special tool to radius the inside of a hosel in order to help provide a measure of protection, particularly for a graphite shaft. Typically heads are countersunk at a 20-degree angle. The term "countersink" may also be used to describe the tool used (in a drill or drill press) to create the countersink.
A countersink is a tapered hole drilled with a wide outer portion. A common usage is to allow the head of a countersunk bolt or screw, when placed in the hole, to sit flush with or below the surface of the surrounding material. (By comparison, a counterbore makes a flat-bottomed hole that might be used with a hex-headed capscrew.)