counterbore


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counterbore

[′kau̇nt·ər‚bȯr]
(design engineering)
A flat-bottom enlargement of the mouth of a cylindrical bore to enlarge a borehole and give it a flat bottom.
(engineering)
To enlarge a borehole by means of a counterbore.

counterbore

To enlarge a hole to receive the head of a bolt or a nut.
References in periodicals archive ?
The line includes inch size screw shank dowel drills, brad point drills, counterbores, countersinks and center drills.
The single tool can also replace additional tools in machining of chamfers and counterbores.
On the bolt body, counterbore the left side of the 7/32" hole to allow the head of the handle to be below the edges of the bolt.
You can also view indexable-carbide counterbore tools and a center-cutting four-flute nose-piece tool with positive cutting geometry designed for plunging, slotting, ramping, profiling, and contouring.
Be sure to set it up squarely before doing any drilling, or the counterbore my run off course.
The firm will cut extrusions to specific lengths, counterbore for anchor fasteners, drill access holes, perform miter cuts, and mill door latches and flange notches.
Remaining stations in this machine counterbore the skirt, finish skirt length, rough bore the wrist pin hole, groove the wrist pin bores, broach the oil slots, and drill the smoke holes.
GH-Z back spotfacer and counterbore tool is capable of producing accurate back spotfacing requirements and precision forms.
Replaceable serrated grippers come in round, square, counterbore, adjustable, angle-grip, adjusta-grip, and accu-grip.
It can check valve-seat counterbore diameter and seating faces, cam-bore thrust faces, tappet bores, valve-guide insert bushings and bores, and camshaft bores.