Don't rely on gauges being standard sizes, in production environment gauges are made to suit the process. Gauges are made to suit pre finish sizes, say for a drilled hole prior to finishing where the hole is a non rounded size.

Martin, gauges are usually made to be a push fit meaning that they will be very slightly undersize because if they were dead size you would need a press to insert them.

Brian

Yes a typo will correct it.

What did you measure with? as 3 decimal places may not be accurate enough as the difference between exact metric and just under is a couple of tenths.

There are hardly any "odd sizes" if you convert them, just a mix of whole mm and 32nd imperial.

Edited By JasonB on 03/05/2021 16:18:05

If you have the kit, it may be worth setting up a clock with slip gauges and rolling each gauge under the clock (Using it as a Comparator )

That should allow you to measure each gauge more accurately. It will also allow you to check that thre is no taper along the length.

Howard