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Counterbore

   Also found in: Acronyms, Encyclopedia, Wikipedia 0.01 sec.
Coun`ter`bore´    (koun`t?r-b?r´)
n.1.A flat-bottomed cylindrical enlargement of the mouth of a hole, usually of slight depth, as for receiving a cylindrical screw head.
2.A kind of pin drill with the cutting edge or edges normal to the axis; - used for enlarging a hole, or for forming a flat-bottomed recess at its mouth.
v. t.1.To form a counterbore in, by boring, turning, or drilling; to enlarge, as a hole, by means of a counterbore.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.Counterborecounterbore - a bit for enlarging the upper part of a hole
countersink bit, countersink
bit - the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press; "he looked around for the right size bit"


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In the new design, the holes are formed with a lead-in chamfer to facilitate pushpin insertion and a counterbore formed inside the hole that creates a shoulder to hold the pins in place.
Forming: a mini-compendium of developments. (Equipment & Applications) by Vasilash, Gary S. / Automotive Design & Production
Once the fastener is inserted into the hole, the tool rotation is reversed to a counterbore direction, causing the slotted insert body to collapse and fold into symmetrical segments that grip the plastic firmly.
Automation & 'ovenless' molding highlight rotomolding expo by Plastics Technology
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