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Image 1 - what type of nut it is? what tool I have to use to open it?

Image2 - what type of lock it is? what tool I have to use to open it?

Please see the two images. I marked a nut and locking part. what type of nut and lock mechanism it is? and what is the tool I have to use to open it?

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You need to hold the shaft (in a vise with protective jaws) and turn that nut with a "C" spanner - which looks like a C with a single protruding tooth.

enter image description here

A poor method is to use a drift or punch, but this always damages the nut - perhaps fine for a temporary repair...

Edit as Fred says that is a circlip, actually in internal circlip which means that the nut above needs to be removed first then that circlip will come out.

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  • $\begingroup$ Thanks. What is that other part that I marked in the second image? what the name of that nut? $\endgroup$ – Aayvu.com Jul 8 '18 at 9:16
  • $\begingroup$ Called C nuts... as for the other pic - need more detail - may just be the face edge of a clamping nut for the bearing... $\endgroup$ – Solar Mike Jul 8 '18 at 9:19
  • $\begingroup$ The second photo shows a circlip, the size of which I've never seen before, but is clearly that type of retainer. $\endgroup$ – fred_dot_u Jul 8 '18 at 10:41
  • $\begingroup$ Sometimes also called a collet wrench and collet nut, due to one of their more common uses. $\endgroup$ – Phil Sweet Jul 8 '18 at 12:56

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