An O-ring is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a disc-shaped cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface..
Self-Drilling Screw, #6 x 1/2 in, Zinc Plated Steel Flat Head Phillips Drive, 80 PK Ideal for any project involving light gauge sheet metal, awnings, door and window frames, gutters, sheds.
A coupling nut is a long nut tapped from each side to meet in the middle, rather than all the way through in the same direction, used to connect two threaded rods end to end.
.3/4"-10 x 5" Zinc Plated Grade 5 Steel Coarse Thread Carriage Bolts 20PK The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened.