Which component attaches a connecting rod to a piston?

Which component attaches a connecting rod to a piston?

• A. Wrist Pin
• B. Piston Ring
• C. Piston Pin
• D. Connecting Rod Bearing

Answer: (A)

The wrist pin is the connection between the piston and the connecting rod. It’s a short, hardened pin that passes through a hole in the piston near its top (the piston boss) and into the small end of the connecting rod, forming a hinge. This lets the piston slide up and down in the cylinder while the rod pivots on the pin as the crankshaft turns, transferring the combustion forces into rotational motion. Piston rings sit in grooves on the piston to seal the combustion chamber and don’t attach the rod to the piston; the rod bearing is the interface between the connecting rod and the crankshaft, handling the rotational connection at the crank. The pin (wrist pin) is the correct part for linking the piston to the rod.

The wrist pin is the connection between the piston and the connecting rod. It’s a short, hardened pin that passes through a hole in the piston near its top (the piston boss) and into the small end of the connecting rod, forming a hinge. This lets the piston slide up and down in the cylinder while the rod pivots on the pin as the crankshaft turns, transferring the combustion forces into rotational motion. Piston rings sit in grooves on the piston to seal the combustion chamber and don’t attach the rod to the piston; the rod bearing is the interface between the connecting rod and the crankshaft, handling the rotational connection at the crank. The pin (wrist pin) is the correct part for linking the piston to the rod.