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countersink
(ko̵unt′ər siŋk′)
transitive verb countersunk, countersinking
- to enlarge the top part of (a hole in metal, wood, etc.) so that the head of a bolt, screw, etc. will fit flush with or below the surface
- to sink the head of (a bolt, screw, etc.) into such a hole
noun
- a bit for countersinking holes
- a countersunk hole
See countersink in American Heritage Dictionary 4
noun
- A hole with the top part enlarged so that the head of a screw or bolt will lie flush with or below the surface.
- A tool for making such a hole.
- To make a countersink on or in.
- To drive (a screw or bolt) into a countersink.
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countersink
single-flute countersink bit
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