CZ527 bolt thread size question

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Katitmail

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I need to make some studs (to complete bedding job) but can't figure out what is the bolt thread on those bolts (action)

I assume it's metric.
Step measures at exactly 0.8mm
Diameter measures 4.9mm I assume it's a 5x0.8mm thread. However, I have die of this size and bolt doesn't go in..

What is correct size?
 
It is 5x0.8. My die wasn't going on original bolt, but I found info online and found another bolt in my stash to prove.

I'm good. Thanks!
 
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