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Discussion Starter · #1 ·
The title says it all....

What is the diameter of the stock retaining nut on a 391 Urika? I know it's something metric but from there I'm stuck since I do not have a full set of metric sockets.

Thanks.
 

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albanygun said:
What is the thread size of my 390/391 stock bolt ?

Answer
The bolt for the Model 390/391 is threaded to 8.0 mm x 1.0 mm
Albanygun,

Your answer is correct. It's just not the answer to the question that was asked by Bopper. :wink: The numbers 8.0mm x 1.0mm refer to the diameter and the pitch (spacing) of the threads on the bolt, not to the size of the head on the bolt. The head size, as stated above, is 13mm. :)
 
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