Graphical Construction Glossary >> Tools. >> Power Tools >> Countersink Bits

Countersink Bits
Machine and hand bits for for countersinking holes in wood, metal and plastics.
Countersink, Counterbore
A depression that is made to receive the head of a screw or bolt so that it does not protrude above the surface.

small countersink bits
Photo thanks to Wikimedia Commons, User: Glenn McKechnie

The bit above has a round shank suitable for using in an electric drill. I have a couple of smaller ones that have a hexagonal shank that suits my electric screwdriver gun. The ones shown here are said to be for "metal and timber" but in reality I would never use them for steel. The get blunt too quickly and they are hard to sharpen.

A far better method for steel is to use a larger HSS drill bit. The end bevels on them are just about the same as standard countersunk head screws. They do wear unevenly when used for countersinking work but at leasst they are easy to sharpen. If doing a lot of holes I normally make a stop for the drill bit. That is I drill through a piece of wood (something like a piece of broom handle) that is just the right length to leave the correct cutting depth showing.

large countesink bit
Photo thanks to Wikimedia Commons, User: Cal.on

This particular one is designed for power tool use, having only one three flutes. Bits designed for use in hand tools have many more flutes or cutting edges.

If you didn't find exactly what you are looking for try this search tool that will search the site and the web.

"What can be added to the happiness of a man who is in health, out of debt, and has a clear conscience?
Adam Smith 1723-1790

"When we build, let us think that we build for ever."John Ruskin 1819-1900

coates hire
Hire Equipment
Furniture Fittings - Architectural Hardware - Electronic Locking Systems - Technical Hardware
BuilderBill sponsorship

BuilderBill Books

building maths
Building Maths

Stair Design
asbestos ebook
Asbestos Book

Calculator Pages.

Concrete yardage calculator

Reader's Questions.

Questions and answers.



Please Note! The information on this site is offered as a guide only!  When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area.  It could be out of date!  Regulations breed faster than rabbits!
You must check your own local conditions.
Copyright © Bill Bradley 2007-2012. All rights reserved.
Page copy protected against web site content infringement by Copyscape