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a bolt with threads on both ends, to be screwed permanently into a fixed part at one end and receive a nut upon the other; - called also standing bolt.
Collar bolt or Flange bolt is identifiable by the ridge or surrounding the bolt head, this built-in washer under the head of the Bolt
A carriage bolt, also known as a 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.
