Yes, can't believe I didn't think of that.
The last row is possibly an error on the drawing and should in fact be .6 M/M. I can't think of anything else it could be.
Thank you
I am trying to uncover what "M/M" means on dimensions from bearing drawing. It was produced in 1971 but later revisions in 1999 and in 2010 and not sure if revisions added the "M/M". No reference to drawing specification but is an old British drawing so assume BS 308.
Dimensions as follows...