Quote Originally Posted by Davo View Post
Some wood screws are not threaded all the way to the head; some hex bolts are. Otherwise your definition correlates with my experience.

EDIT: See "What Every Member of the Trade Community Should Know About: Distinguishing Bolts from Screws" at http://www.cbp.gov/sites/default/fil...s/icp013_3.pdf for US standards.
If you think you have a bolt that is threaded all the way to the head then it is a screw, not a bolt.

A screw:
http://blog.mutualscrew.com/blog/ass...-diamaters.jpg
A bolt:
http://www.ahc-camberley.co.uk/media...inc_plated.jpg