a type of bolt threaded only at the end opposite the head, used mostly for fastening pieces of timber together, and inserted into pre-drilled holes.
a round-headed bolt that can be set flush with the surface.
A bolt with a rounded head that is pulled down onto the surface of the wood as the nut is tightened. Used to hold structural members together, the rounded head gives a finished look to the bolt. Bolts should be checked annually and tightened if necessary.
a round-headed bolt for timber; threaded along part of the shank; inserted into holes already drilled
a bolt with a domed or round head
A bolt with a smooth rounded head and a small square section under the head to prevent spinning durring assembly. Used in wood.
A bolt with a square shank next to the head to allow tightening in wood without tools.
A bolt with a smooth, round head used in wood. Since the head is rounded, a small square section under the head keeps the bolt from spinning while the nut is tightened on the other side.
Bolt with a squarish section under a rounded head without a slot; underneath the head is a square shoulder. It bears a resemblance to a wood screw and is good for wood to wood connections. Carriage bolts have either cut or rolled threads. Cut thread bolts have threads cut into the bolt; the rolled thread bolts have the threads pressed into the bolt shaft making the threaded section a little thicker than the bar shank. Cut thread bolts are the preferred type because they are more uniform. Rolled thread bolts work well in smaller sizes but, in larger sizes, the shank may be loose enough in a large hole to pass the threaded end. To use: carriage bolts are pushed into a hole the same size as the shank and then hammered in the rest of the way; the squarish part locks it firmly in place.
