Bolts

• Bolts - a metallic pin or rod having a head on one end

  and an external thread on the other for screwing up a

  nut.
• Machine Bolt - a threaded bolt having a straight shank

  and conventional head such as a square, hexagonal,

  etc.;
• Carriage Bolt - a threaded bolt having a circular head,

  an oval or flat bearing surface, and a means of

  preventing rotation of bolt;
• Toggle Bolt - bolt used to fasten objects to a hollow

  wall or to a wall which is accessible only from one side;
• Expansion Bolt - anchoring device having an

  expandable socket that swells as the bolt is tightened

  into it.
• RIVETS - are metal pins that are used for permanently joining two or more structural steel members by passing a headed shank through a hole in each piece and hammering down the plain end to form a second head.
• NUT – a short metal block having a central hole which is threaded to receive a bolt, screw, or other threaded part