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So, the folks that wrote the standard weren't worried about hydrogen embrittlement with these three finish options. Looks like your screws have one of the two black oxide finishes. The shape of the fracture looks most like stress corrosion cracking from the pictures at the link provided by...

Ok. But, you should.

Casters are dominated by abuse loads (i.e. slamming into a curb, dropping of an edge....) You're unlikely to find fully non metallic. Plenty of choices for non conductive wheels or treads.

Are you designing the orange part too? Just use much smaller screws. 26 x 1/2 screws gives you almost 600,000 lbs tension capacity, which is rather more than you need.

I don't have a strong opinion about it, so it seems your designer is not fully informed.

100 plus year old building with wood floors saturated with 100 plus years of cutting oil, etc.

As the simplest possible check, a 1/2" nut is 3/4" across the flats. What is the loading force and direction?

You'll probably find it here: https://copper.org/

Please share what you learned.

How convenient that AR also happens to be your initials! Go for it. For a more literary option, consider "Reardon Metal"

Here's a study of materials from a US supplier. Several species studied, but not any actual sugi. https://www.mdpi.com/1999-4907/12/9/1262

The Japanese characters are 焼杉板. Literally, burnt "sugi" plank. Sugi is the Japanese ceder tree, which is anyways insect and water resistant. Perhaps the heat polymerizes the natural ceder resins? Or maybe the benefits are basically those of the wood itself. Your mileage may vary if...

Anicdotally, here in Japan there are many old buildings (hundreds of years) with the charred finish still standing. It was used extensively on "yagura", out buildings used to store valuable items. My father in law's yagura has this finish, not sure how old it is.

We use DropBox. I like OneDrive's collaboration features and automatic version controls. Both are better than DropBox.

The NTSB report on the Fern Hollow Bridge collapse in Pittsburg made the remarkable assertation that "rust makes metal weaker". https://www.eng-tips.com/threads/pittsburgh-bridge-collapse.507081/ It seems that the State of Washington has been conducting a peer review test of this assertation...

The damper design seems different.

The drawing looks to be from Germany (or one of the other German speaking countries). "OX" is possibly from "Oxelösund" which once might have been an independent mill, but is now part of SSAB. https://www.ssab.com/en/news/2023/06/ssab-invests-in-green-transformation-of-production-in-oxelsund

Maybe if the fingers were more 3-dimensional. If they had a triangular cross-section then packages would be more likely to slide back down, onto the belt, instead of getting stuck on top of the fingers. A rounded tip, instead of pointy, might also help.

Ok, the priming water comes from a pipe. So the pump is the thing that looks like a tank? And the other thing that looks like a tank is the motor? And there aren't actually any tanks at all? How, exactly, is the motor that overheats when it's not doing any work (no prime, no flow, no work)...

Where does the priming water come from?