wrist pin

noun Machinery.
a pin joining the end of a connecting rod to a trunk piston or the end of a piston rod.

Origin:
1870–75

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World English Dictionary
wrist pin
 
n
1.  a cylindrical boss or pin attached to the side of a wheel parallel with the axis, esp one forming a bearing for a crank
2.  (US), (Canadian) Also called (esp in Britain): gudgeon pin the pin through the skirt of a piston in an internal-combustion engine, to which the little end of the connecting rod is attached

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Example sentences
The connecting rod contains a machining defect in the wrist pin bushing of the rod that could cause a seizure of the piston pin.
The piston broke at the wrist pin hole and seized in the cylinder.
The piston is connected to the crank by a connecting rod and wrist pin.
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