They are used as a locking device to hold pins or castle nuts in place. Cotter pins are wire formed pins with two prongs that separate during installation.1/16" x 1" Cotter Pin Clip, 150PK These low-cost and highly versatile fasteners are used virtually everywhere..
R-160 Square O-Ring (ID: 5 1/4", CS 3/32", OD 5 7/16"), 6PK The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.
Machine screws are used in fastening nearly all types of hard materials..#6-32 x 3 in Combination Phillips/Slotted Truss Machine Screw, Zinc Plated Steel, 100 PK Commonly used with flat or lockwashers.
#6-32 x 3 in Combination Phillips/Slotted Truss Machine Screw, Zinc Plated Steel, 100 PK Commonly used with flat or lockwashers. Especially useful in metal-to-metal or where heavy duty fastening is required.