Graphical Construction Glossary >> Tools. >> Hand Tools >> Auger Bit

Auger Bit
In woodworking, a tool for drilling holes in wood.

hand augers auger bit for electric drill

On the left above are two augers and an extension socket to join rods to an auger to drill long holes. These are all old hand augers. The round socket takes a wooden cross bar that makes the tool look like a letter "T". The tool is worked two handed.

The wood auger typically has a small lead in section at the tip that in old hand augers is fairly course. Machine driven augers sometimes need a finer lead in screw.

On the right is an auger for use in an electric drill with a smooth plain round shank. Some of them have three flats on the shank to aid the grip of the chuck.

Note that the modern bit has a spur to first score a circular cut and a flat section to remove the wood.

brace auger
Photo thanks to Wikimedia Commons, User: Luigizanasi

Above is a bit that is seen quite often but not used too much these days, it is designed to be used in a hand brace. Just about all the ones that I had left of these sort of bits, I have chopped the square flats off so that I could use them in electric drills. (Sacrilege eh!)

hex shaft auger
Photo thanks to Wikimedia Commons, User: Emrys2

This auger has a shank that allows it to fit into a hexagon socket that is used on electric screwdrivers and the like.

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