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Estimation of bolt size and property class

Which dimension and strength should a bolt have for my application?
Estimate the required diameter and property class.

Based on VDI 2230:2014 

Initial data
I
I
I
I
Estimated nominal bolt diameter per property class
8.8
5
mm
10.9
4
mm
12.9
4
mm

Verify your calculation, maximize potential of your product.

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