Which fastener secures bolts, nuts, pins and screws?

Which fastener secures bolts, nuts, pins and screws?

• A. Rivet
• B. Cotter Pin
• C. Clevis Pin
• D. Nuts

Answer: (B)

A cotter pin acts as a locking device that prevents fasteners from turning loose. It’s a split pin that you pass through a hole in a bolt, nut, pin, or shaft, then bend the ends to lock the assembly in place. That bending creates a physical barrier to rotation, so the nut or bolt can’t back off under vibration or movement, and it can also secure a clevis pin or similar component. Rivets are permanent joints and don’t lock existing fasteners in place; a clevis pin is the part being secured (not the locking device); nuts are fasteners themselves, but they don’t inherently prevent loosening unless paired with a locking method like a cotter pin.

A cotter pin acts as a locking device that prevents fasteners from turning loose. It’s a split pin that you pass through a hole in a bolt, nut, pin, or shaft, then bend the ends to lock the assembly in place. That bending creates a physical barrier to rotation, so the nut or bolt can’t back off under vibration or movement, and it can also secure a clevis pin or similar component. Rivets are permanent joints and don’t lock existing fasteners in place; a clevis pin is the part being secured (not the locking device); nuts are fasteners themselves, but they don’t inherently prevent loosening unless paired with a locking method like a cotter pin.