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 ?
For example, a counterbore locking fastener arrangement secures a flywheel, weighing several thousand pounds, to canning machinery.
Again the coating might have been the problem, but I had to counterbore the hole to guarantee a slip fit for the plunger.
Ejection is accomplished by a plunger-type ejector that is set in the outer edge of the bolt face counterbore.
Peter Matysiak of Emuge Corporation was boasting of his new "Mosys" tool holder that, when used with Emuge's Thrillers can drill, thread, chamfer, and spot face or counterbore in one pass.
1mm diameter automatic transmission gear with a deep counterbore, a combination of wiper-geometry and high-performance boring inserts cut cycle time 17 percent.
Create the recess with a counterbore bit (Photo 3 inset), which you can buy at any hardware store for about $2.
European Cutting Tooling Systems produces a new one-piece counterbore or countersink type bit.
The crown is flat with a rough "bubba-like" counterbore to break the transition at the muzzle.