What is this part called

[datguyoverdare]

Hi my name's Tyler.  The short version of this is I know this is a power tools forum but I couldn't find a better forum for this question.  I need to replace a part but I can't find the part online because I don't know what the part is called.  Figured people on a power tool forum must be pretty handy and would know what it's called.  The part I'm talking about is this little wedge/cone shaped thing around this bolt.  I can still use it right now but I'd like to get a spare for when it eventually breaks.  I don't need to know the size, I'm sure I can figure that out myself.  I just need the name of the part so I can find them.  Thanks a bunch in advance

[HiltiWpg]

Looks like the inside of a sleeve anchor.

 

What is this for?

 

https://www.mutualscrew.com/product/powers-5815s-38-x-178-rod-hanger-lokbolt-asreg-sleeve-anchor-185402.cfm

 

 

 

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[datguyoverdare]

It's for installing a bolt takedown disc onto a K98K stock.  Specifically for bending the ends of a roll pin which holds these two discs in place.  I don't think what you showed me is the same thing but I think It'll work the same as what I've got so I'll probably just end up getting one of those.  Thanks for the help