What Are The Common Types Of Screws?

Choosing the best shape for the screw depends upon the purpose it must serve. Here are the most common shape and sizes of screws:

Flat head - This screw is the most popular and can be counter-sunk, meaning, screwed in until its head is level with or somewhat below the surface of the stock.

Oval head - This screw type can be countersunk and commonly sunk to the rim, it usually bulges out a bit.

Round head - The screw head has a slightly decorative function for it bulges out totally.

Fillister head - The head is shaped like three checkers atop each other to be easily countersunk.

Bung head - The little head, not much wider than the shank, can be comfortably countersunk.

Binding head - This screw type has slightly tapered sides and round top.

Lentil head -This screw is shaped like a little M & M candy.

Headless- The slot of this screw is recessed in the stem.

Truss head or Stove head - The head of this screw is wide and thin.

Pan head - As the name implies, the head is formed like an inverted frypan, narrower on the top, flat on top and bottom.

Drive - A steel, spiral knurl (an elevated twirl) is tempered to make the screw easily driven into soft metal.

Dovel -It is a wood screw with threads on both ends.

Winged - The screw head is shaped like a wing for it to be turned using the fingers.

Hanger bolt -This is basically a wood screw on one end and a machine bolt on the other.
 

© 2011 Athena Goodlight

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Article Written by Athena

Freelance writer since 2007 Content Provider Musician Educator Homeschooling WAHM


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