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How to Find Die Size for Crankshaft Bolt

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The threads on my xr100 crankshaft bolt got damaged and now I need to find a die. How would I measure the bolt to make sure I buy the correct die size?

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Buy or borrow a thread gauge. Or take the bolt to your local supplier and have them i.d.  it for youScreenshot_20190111-153901_Google.jpg.95eff67b8fa98fd2741cd197aa56fc4c.jpg

Edited by wr250ish

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If just the threads on the end of the crank are damaged you can clean them up with small three sided file or you can round the end off with a flat file to get the same effect as the tool in the video. If the threads that come in contact with the seated nut are damaged you will need a die. Just bring the nut to a nut and bolt or machinery supply store and they can supply the correct size die. Or bring the crank to a machinist and he can dress it up for you.

 

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Buy a new nut. Use that for figuring out the die size. But it would be cheaper to have a machine shop fix it (slip  the guy a $10) Vs. buying a die for $20

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my size is 12mm od and 1mm pitch. and yes, the damage is just on the end. so i have a file and all I do is file the end to a cone shape?

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7 minutes ago, Judah Gardner said:

my size is 12mm od and 1mm pitch. and yes, the damage is just on the end. so i have a file and all I do is file the end to a cone shape?

Yes

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