Sanity check - thread size for linear rails

[Doddy]

When the manufacturer specs 5mm bolts, why even consider something else?

And you really think you can drill a series of 6mm holes in a perfectly straight line, with absolutely perfect spacing?

I quoted the hywin spec, which on paper looks the same as the chinese, but it is enough for me to see that this is a point considered by others here already.

It remains a sloppy fit, but as alluded to here that might be of benefit. M5’s ordered yesterday.

(On the actual Hywins that I fitted into the Z on the Starmill I did, out of ignorance, drill and tap for M6 using the rail as a guide)