Tip for us silly Americans: Irwin #8 wire gauge bit is 5.0594mm in diameter, perfect for drilling out drive gears, or pulleys for stepper motor shafts. If you need them quick, they can be found at most ACE stores near their taps.
Seen this?
Yeah, but that’s decimal inches. If they added a metric equiv column, that chart would be amazing.
That’s big of you @ThantiK , admitting that Americans are silly 
I constantly get imperial jobs at my workplace, working with metric machinery, there’s always numbers like 5.0594mm…
I feel your pain mate, will be great when we have ONE system, worldwide…
Preferably one that doesn’t have fractions so that it is easy to work with digitally! #MetricFTW
@Jarred_Baines it’s actually a good thing the imperial measurement existed. We needed to drill out drive gears for our printers. 5.0mm was too small. 5.1 was too large (lobing the drive pulley results in inconsistent fill) - so…the imperial drill was a life saver because I couldn’t find a 5.05 drill bit ANYWHERE.
You might think that 0.1mm is a little much to get anal over, but it matters.
Oh no no no! I run a CNC lathe and get asked for .005mm tolerances some days! I get it 
5.05 drill sounds perfect!
As a Canadian I’m proud to say I’m comfortable in both. The odd case @ThantiK brings up is good. What pisses me off is when GM or Ford can’t decide which to use throughout a vehicle. SI [System International] is logical and allows for quick calculations . It is the arcane Furlongs per fortnight, inches of mercury that make no sense.
I’m just not used to working in decimal mm, .0594mm works out to a little more than 2 thousandths of an inch. So, 0.002 larger than 5mm ought to be a nice fit. 
And i’m just sitting here giggling about the kinds of problems you guys are having to deal with
@Thomas_Sanladerer You’ve never had to work in imperial/metric?
@Jarred_Baines pretty much. I’m deep in metric land, so the only occasions where I touch inches are tripod camera threads, watercooling connector (or pipe) threads and screen sizes. Everything else is strictly metric and, in fact, a sane person wouldn’t even think about working in imperial units unless they absolutely had to.
@Thomas_Sanladerer Mate, I say that at work EVERY time we get imperial drawings of parts to make… We have the knowledge and understanding these days to PROVE that metric is an easier system to work with… I don’t know why imperial is still being used overseas… The units don’t even divide into each other by the same amount???
12 inches = 1 foot
3 feet = 1 yard?
1760 yards = 1 mile???
Where is the logic??? >_<
@Jarred_Baines Wait til you see furlongs, rods, leagues and some of the other linear units. I think cubits are no longer used though…
Whitworth. And by the same token, Japanese Industrial Standard (anyone working on 60’s vintage Hondas knows about JIS…or will)
With enough torque anything can be rethreaded [cross-threaded] !
friction welded