countersink

Screw head recess

A countersink is a conical hole cut into material so that a screw or bolt head sits flush with or below the surface.

The tool that cuts such holes is also called a countersink.

As a verb, to countersink is to create this recess or to drive a fastener into one: Countersink the screws so the surface is smooth.

tool

bit

Small amount or portion

pilot-holePreparatory drill opening
reamerHole-enlarging cutting tool
shankLower leg segment

flute · taper · carbide · adjustable · chuck · set

action

bore

Tiresome individual or drill

reamPaper unit, 500 sheets
chamferAngled corner cut
deburrRemove rough edges

taper · plunge · drill · enlarge · bevel · cut · machine · seat · flare · widen

recess

depression

Prolonged low state

taperNarrow gradually toward point
bevelSloped edge or cut
chamferAngled corner cut

cone · cavity · seat · pocket · indentation · angle · flare · dimple · well

result

flush

Same suit, five cards

flatLacking vertical variation
smoothWithout roughness or difficulty
levelHorizontal or uniform position

even · seamless · recessed · seated · integrated · concealed · surface-mount · clean · finished · uniform

metalworking

machining

Subtractive metalworking process

latheRotating shaping machine
millingProcessing grain mechanically
sheet-metalFlat-rolled thin alloy

aluminum · steel · aerospace · deburring · coolant · tolerance · aviation · fabrication

fastening

screw

Threaded metal fastener

screwheadFastener's top surface
boltThreaded rod for nuts
flatheadStraight-tipped tool or fish

washer · fastener · slotted · anchor · rivet

woodworking

cabinetmaking

Craft of building furniture

joineryFitting wood pieces together
furnitureMovable room objects
hardwoodDense deciduous timber

softwood · plywood · pilot-hole · screwhead · plug · dowel · veneer · trim · millwork

countersink

bit

bore

depression

flush

machining

screw

cabinetmaking

countersink

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