Bolt

• head

  A projection out from one end; "the head of the nail", "a pinhead is the head of a pin".

• clinch

  The flattened part of a nail or bolt or rivet.

Also contains

• tack

  A short nail with a sharp point and a large head.

• stem

  Cylinder forming a long narrow part of something.

• staple

  A short U-shaped wire nail for securing cables.

• brad

  A small nail.

• sixpenny nail

  A nail 2 inches long.

• hobnail

  A short nail with a thick head; used to protect the soles of boots.

• spike

  A large stout nail; "they used spikes to fasten the rails to a railroad tie".

• clout

  A short nail with a flat head; used to attach sheet metal to wood.

• stub nail

  A short thick nail.

• nailhead

  Flattened boss on the end of nail opposite to the point.

• fourpenny nail

  A nail 1.5 inches long.

• tenpenny nail

  A nail 3 inches long.

• eightpenny nail

  A nail 2.5 inches long.

• doornail

  A nail with a large head; formerly used to decorate doors.