Overview of ISO metric screw threads M3 – M30.
Commonly used screw threads on 1948 – 1969 BMW models are M6x1 coarse, M8x1.25 coarse and M8x1.0 fine.

ISO Metric screw thread table

 

ISO metric screw thread

The length of bolts and screws is measured like this:

bolt-and-screw-length

 

 

 

 

 

 

 

 

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