The piston pin of the Mercedes is of chrome nickel steel, and is retained in the piston by means of a set screw and cotter pin.
"A History of Aeronautics" by E. Charles Vivian
We found that somebody had pulled out the cotter or iron pin which held the wagon wheel on.
"Thurston of Orchard Valley" by Harold Bindloss
Another plan is to put a cotter through the crank and the crank-pin.
"An Introduction to Machine Drawing and Design" by David Allan Low
Clavette Key; cotter; linch-pin.
"English-French and French-English dictionary of the motor car, cycle, and boat" by Frederick Lucas
Slogging through the bewildering caverns of Home Depot in search of a cotter pin or a 4mm Allen wrench springs to mind -- when you're apt to experience a paradigm shift.
Will have in stock more than 1,000 hardware part numbers, including AN-bolts, screws, nuts, washers, and cotter pins.
Once the castle nuts were threaded onto the studs, we raised the jack some more and ran the castle nuts all the way, securing them with new cotter pins.
Line up the castle nut or retainer to install the cotter pin.