Stainless Steel Fasteners: Nuts, bolts, washers etc
Zinc Plated Fasteners: Nuts, Lock Nuts, Washers etc.
Galvanised fasteners: Nuts, UNC Nuts, Washers etc.
A Tie Bar Connector or Coupling Nut is essentially a very long nut, it has an internal thread from top to bottom and is used to join 2 objects with the corresponding male thread for example bolts or more likely studding.
Heavy Hexagon Nuts
Heavy hex nuts are slightly larger and thicker than standard nuts (H=D, so the height of the nut = the diameter of the bolt). There are numerous grades
Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized heavy hex nuts are tapped oversize to compensate for the corrosion resistant coating on the thread of the bolt
Self Colour Mild Steel Fasteners: Nuts, bolts, washers etc
Metal and Nylon spacers / washers, can be used to stop wear on a certain component or simply to fill a space for example holding a panel off a wall.