Carriage bolt

Closely related to the carriage bolt is the timber bolt (also called mushroom-head bolt and dome-head bolt), meant to fasten wood to wood (rather than metal to wood), for use with large wood planks and structures. It has a domed head that is proportionally wider than that of a carriage bolt. Instead of the carriage bolt's square part of the shank immediately under the head, the timber bolt has four fillets, whose sharp corners grip the edge of the hole in the wood to prevent rotation. == Plow bolt ==

The plow bolt or plough bolt is a flush-fitting carriage bolt, whose head is countersunk beneath the surface of the material. The plow bolt was devised to hold replaceable plowshares to the moldboards of iron plows. The share, the fastest-wearing part of the plow, would be replaced several times over the life of the plow. Such bolts continue to be used anywhere a protruding head is undesirable, such as to hold shovels onto cultivators, and cutting edges onto earthmoving implements. == See also ==