250r locknut on a 300ex

[Imbroke]

will a 250r locknut work on a stock 300ex axle or any other locknuts like 450r 400ex 250x 350x fit

[alberto]

I think its all the same for the 250r-450r. You may want to consider going aftermarket. I had to replace mine on a 400ex and an OEM was about 25 and aftermarket billet (MODQUAD) cost 40 looks much nicer and easier to up keep and remove. RAD also make a nice axel lock too.