counterbore

IPA: kˈaʊnɝbˈɔri

A cylindrical recess, typically machined at the mouth of a hole to admit a screw (such as a cap screw) so that the screw sits flush with a surface.
The cutter used to cut such a recess. (Also used, at less depth, for spotfacing.)

Examples of "counterbore" in Sentences

Figure 5 Counterboring with the piloted counterbore
Counterboring/countersinking with counterbore/countersink and turning tool3.
Counterboring/countersinking with counterbore/countersink and turning tool1.
Counterboring/countersinking with counterbore/countersink and turning tool7.
- Did the trainee countersink/counterbore both sides of a through hole properly?
- Did he set the correct rotational speed and were counterbore diameter and depth correct?
Counterboring/countersinking with counterbore/countersink and turning tool Institut fr berufliche Entwicklung e.
- Internal side-cutting tool (boring tool) or spiral-fluted counterbore (three-lipped twist drill) to produce the hole with machining allowance for reaming.
- Combination tools (piloted counterbore, step countersink, combination countersink) can be economically used since several operations are combined into a single one.
Counterboring/countersinking with counterbore/countersink and turning tool is a finishing operation on the internal surface of internally premachined rotationally symmetrical parts.