Bolt size for X to Y

Anyone know bolt size from X to Y?

I believe they are recorded in a packing list made early on by a forum member -
According to his document:
“M6x22 Socket Head Cap screws for mounting X gantry to Y rails”

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I can confirm they are M6. You can use 18mm, but 16mm is a no go (don’t ask how I know :confused:).