Screws for Metabones smart adapter mark v Canon mount

Started 3 months ago | Discussions thread
VLreviews
VLreviews Regular Member • Posts: 234
Re: Screws for Metabones smart adapter mark v Canon mount
1

Tom Caldwell wrote:

I think that Ernsts M4 is probably correct - my vernier calipers said 3.8mm - but I might have had them over-tight when measuring. There is no doubt that the “HUA 10.9” refers to the actual screw thread length (add the countersunk head).

No, the 10.9 refers to the strength class: https://en.wikipedia.org/wiki/Screw#Mechanical_classifications

With your measures, this is most likely a custom M4 machine screw with length 13.5. In that case, an M4x13 should fit fine. The more typical strength class is 8.8, so you might need to search a bit for one in 10.9 (higher strength).

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