There was a standard thread for metric screws at one time till the Japanese screwed it up ( pun intended ) The other pitches where then specialty items. The DIN standard thread size and pitch together with the drill size used is still printed on the back of most calipers.
The uneven and even wrench sizes again got screwed up by the Japanese , even though on larger things like pipes and big bolts the 22, 24 , 27 and 30 mm wrenches were old standard .... I have never needed a 28mm wrench yet.

Personally I have wrenches and sockets in imperial and metric size up to 24 mm or 1" respectively. After that its metric only and I can make do with that. I am not strong enough to round of a 1 1/2" bolt because the wrench is half a mm to large

A slippery slop you are putting us on there Scuba.
Next thing you know y'all will be expecting us to accept all these foreigners coming across the border to not be made to learn how to speak English like Jesus did in the Bible...

Yes, metric hardware means having to buy 2 sets of tools. Yes, the Japaneese are fond of weird thread sizes. But...service manuals. Japaneese translations can be funny with the left out words and broken sentences. They aren't really too hard to figure out. However, the manuals from a supposedly english speaking country are just downright confusing. What is meant by "Dismount the fixings and remove the spigot from face of block"? Maybe Scuba can interpret that one. Hint: 3054 Perkins manfactured in England.

I can't help you there as I am a Kraut and English is not my first language. I did have to stubble though the workshop manuals for Volvos.... to this day I think the swedes that wrote them were on LSD

After several minutes of head scratching and some useless suggestions by a few other of the shop mechanics I figured out that it meant remove the bolts (fixings) from the shaft (spigot) in order to remove it from the block. It had absolutely nothing to do with fixings that we over here associate with food, or anything to do with the thing that water comes out of.

Reading the posts reminds me of the days oftalking/discussing the measurements with a tool maker.

If you started talking about microns, you got this blank look. The deer in the headlights look.

The metric system sucks:

Both in cubic feet per minute, and liters per second.

Which reminds me....Why haven't those old country geniuses come up with a metric calendar and/or clock?

IDIOTS!!!

First time using metric shingles caused a brain cramp. Can't imagine plywood, framing or drywall.
Painted my mechanic tools red and blue. The box white just like the white house lol.
Color code helps for tools that are mobile and not in a specified drawer.

I forgot about the metric shingle thing. The first day laying out with them was special. LOL

I think there's a fair amount of skill with metric in the US. More wouldn't hurt. Makes us smarter. Kind of like speaking 2 languages. Gives the brain box a little workout.

Running the chain and rod as a young surveyor helper in the late 70's introduced me to the engineering scale of decimal feet.
The foot broken down to 1/100 increments.
A lot easier to broadcast, calculate and understand than 12ths ... or fractions.
10.33' = 10'-4" (+/-) close enough for surveying.

Metric is a standard.
All the other odd stuff can be converted to metric for comparison.
Like the Imperial gallon vs the small US gallon = 4.55 litres to 3.78 litres.
Same as vehicle milage-Litres per 100km-standard for comparison of milage for vehicles in any country regardless of odd measures of gallons miles etc.
Also when mixing fuel for small engines-all the ratios are easy as pie in litres and ml.

What's next, adding a U to words that don't need them!? Lol

So, who here advocates doing away with the English language and moving to a "universal" one that is far less complex, easier to learn and understand ? (as many are said to be)
English being of the most complex in existence.
'Bout the same difference ... to me.

Only thing that matters is, will my beaver grade better in metric?

Esperanto

I worked at a place that made cheapo chipboard furniture, (ie: sawdust and glue), they were quite proud to show off to visitors that all the blueprints were in metric, but failed to point out that the co. too cheap to buy proper tools, supplied tools tools were all English, and the set up man had to do conversions to check things. LOL

"English being of the most complex in existence" ...... who told you that gem of information ??

I don't know how many languages you speak but I found English to be the easiest. ( My guess is that is why t got picked as the international standard ) seeing that more folks speak mandarin and Spanish than english as their native language.
When I did my diving instructor course for PADI I could not make my mind up if I should get the written materials in German, Spanish of English.... I decided on German and what a mistake that was. Whereas the english version fitted nicely into a Rucksack that came with the course materials and still left room for a lunch box and water bottle. The German version needed two rucksacks with little room to spare. It was a bugger as I rode a Motorbike at the time as my daily driver and had to mess with a bunch of bungee chords to hold that all on there.

Could it be that English is a derivative of German with a strong French influence?

I kind of found basic German was fairly easy to grasp.

YEA,,Commie crap! Guess were supposed to put the steering wheels on the passenger side of our pickup trucks now too !!