Cotter Pin

Cotter Pin is a metal fastener with two tines that are bent during installation used to fasten metal together, like with a staple or rivet. Cotter pins come in various sizes, the most common is the 3/8th inch 9.5 mm diameter.

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Detailed Description for Cotter Pin

Cotter Pin is a metal fastener with two tines that are bent during installation used to fasten metal together, like with a staple or rivet. Cotter pins come in various sizes, the most common  is the 3/8th inch 9.5 mm diameter.

Many traditional bikes have cottered cranks. On these bikes, cotters, or cotter pins, are used to attach the cranks to the bottom bracket. If your pedals flop once per rotation this is probably due to wear in the cotters. It's easy and cheap to fix.

It can be difficult to remove and replace cotters. To remove, a hammer is usually the easiest option. Support the crank (this is important) so that you don't end up hammering against the bearings, remove, or partially remove, the nut from the cotter and hit the threaded end with a hammer. When the cotter is out you can fit a new one from the opposite side. Note that this also needs to be fitted firmly. Presses are available to do this, but a hammer works well. Don't try to use the thread to pull the cotter through as it simply doesn't work. Cotters naturally try to work loose, so ride for a few km before tightening again.


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Adriana Grey

Which is better Cotter pins or Bolts and Nuts? Posted on 8/24/2016

No one is better than other. It mainly depends on result which we want like if tight joints are required which can never be loosened and has a ability to stand then nuts and bolts are better to use. On the other hand If you want loose and floppy or not concerned with the joints loosening as time goes on, or not able to manage the tools involved, then cotter pins are great.

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