Countersink


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countersink

[′kau̇nt·ər‚siŋk]
(design engineering)
The tapered and relieved cutting portion in a twist drill, situated between the pilot drill and the body.

Countersink

 

(Russian, zenkovka; from German senken, “to sink, lower”), a cutting tool used for countersinking. Countersinks usually form part of a set with centering drills. The sizes of countersinks in each set depend on the diameter of the hole; in all sets, the vertex angle is 60°. Coun tersinks are made for chamfering center holes with diameters of 0.5 to 1.5 mm (ordinary countersinks), for holes with diameters of 0.5 to 6 mm (with or without protective taper), and for holes with diameters of 8 to 12 mm (with tapered stem). Countersink cutting elements are made from high-speed steel; countersinks with tapered stems are welded and the stems are made from carbon structural steel.

countersink

countersink
A boring bit having a conical-shaped cutter; used to make a depression to receive the head of a screw or bolt so that it does not protrude above the surface.
References in periodicals archive ?
The key is to cut the countersink deep enough to swage the annealed screw head into it to form a seamless joint.
To accomplish the countersink in the others cases (C2 and 3), deformed shape of workpiece shows that the punch pushed the material towards the free regions as shown in Fig.
YOU can drill a pilot hole with a standard drill bit, then create a recess for the screw head with a countersink cutter.
Draw lines 2 inches and 18 1/2 inches from the bottom, then countersink 1 1/4-inch deck screws along these lines 3/4 inch from each edge of each board.
To countersink the lag heads, use the 3/4" spade bit drilled 1/4" deep.
Tenders are invited for Lot 1 dowels, screws, anchor bolts and other; Lot 2 window screw, drill, countersink head, a screw; Lot 3 dowels for insulation with a metal nail for the construction of "Houses efficiency 73,78,79 in the neighborhood" Bilev-3 "in Vitebsk.
I say "nearly" because I have had to tuck a few extra items into it, like a bit extender, a set of pilot countersink bits and some Vix bits, so I end up with a 97-piece set instead of a 90-piece set: I'd say Ryobi pretty much hit it on the head when putting this set together.
Now available anywhere in the world, SMART-BIT was specifically designed by Starborn Industries to create the perfect countersink hole after hole.
Products include countersinks, deburring cutters, tube end forming and finishing tools, disc cutters, stop countersinks and rivet shavers for micro stop cages, adjustable countersinks, ball seat reamers, drill/countersink combinations, rotary files and burrs, as well as precision hole finishing tools.
8 screws, then drill, countersink and screw the shelving onto the fillets using 11 2" No.
Available lead-in configurations include blown, acid etched, or drilled countersink, or any combination.