What is a "carriage bolt," what does it look like, and when would you use or not use one?
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M$2 Answers
Wikipedia (http://en.wikipedia.org/wiki/Screw ) says
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Carriage bolt (coach bolt)
Has a domed or countersunk head, and the shank is topped by a short square section under the head. The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened. A rib neck carriage bolt has several longitudinal ribs instead of the square section, to grip into a metal part being fixed.
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The short of it is that a carriage bolt would be used when you need to fasten together parts with pre-driled holes, where you can shape part of the hole to prevent the bolt from turning, and where you prefer to drive using the nut, rather than the head. You would not use it where you need to drive the head, or where you need the screw to tap its own path.
http://upload.wikimedia.org/wikipedia/commons/f/fe/Bolt_diagram.svg
You can order various types of carriage bolts from McMaster.com at http://www.mcmaster.com/#carriage-bolts/=5xkxjy .
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M$
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
