Unless there are no cones, ie: it's a cartridge bearing hub, then it can only be a locknut as the 2nd post says.
Not only is your diagram incorrect in this, it's also rare to find needle rollers on a hub axle, especially with track and road hubs.
That diagram is of a over built jump bike hub or something. A really poor chioce on my part, but I could'nt be bothered to find something better.
I realise that with a cartridge hub you have no cup-and-cone bearings, so no cone adjustment. But you still have the forementioned nut. Which is adjusted with a cone spanner. I thought it was still called a cone nut (although it will be functioning as a locknut on a cartridge bearing hub). The cone part of the name coming from the spanner interface, as opposed to the use.
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That diagram is of a over built jump bike hub or something. A really poor chioce on my part, but I could'nt be bothered to find something better.
I realise that with a cartridge hub you have no cup-and-cone bearings, so no cone adjustment. But you still have the forementioned nut. Which is adjusted with a cone spanner. I thought it was still called a cone nut (although it will be functioning as a locknut on a cartridge bearing hub). The cone part of the name coming from the spanner interface, as opposed to the use.
Locknut makes sense too though.
Kinda wish I'd gone with pecan now :S