Plastic plugged polkadot platform piece, provenance please?

Steel with Delrin (?) plugs, 5 3/4 x 4 3/4 x 3/4 inches. Digital googology disgorges gobs of hand-held angle grinders but that’s “fake news.” The polkadot surface is likely “exposed” when fastened to its yet-unidentifiable host as indicated by presence of the larger diameter of the socket-head capscrew holes.

 

Now there's a puzzle. That odd one out on the second row is also puzzling. Any rotating rub marks on the Delrin plugs?

 

No. Piece appears to have never been uninstalled. The polkadot surface is likely “exposed” when fastened to its yet-unidentified host as indicated by presence of the larger diameter of the two socket-head capscrew holes on that side.

 

Are the plugs absolutely flush with the surface or do they protrude a little and could act as a sliding bearing surface?

 

I keep seeing this thing on google images when I Search -wgs20-100-150.,but different brand. Brings me to Automation Recovery site and then I can’t find it.

 

I get this
http://pompco.com/docs/2016/en/2016-an-booster-pump-wgs-c38-a-c42.pub.pdf

 

Sorry, it’s wsg!

 

Bingo

https://www.amazon.com/Naams-W011015-Plate-20-100-150-Graphite/dp/B0115GPXPO

 

What is it?

 

Something to do with automotive manufacturing.
http://www.daytonlamina.com/node/1100
https://selflube.com/products/wear-plates/naams-wear-plates

SelfLube's NAAMS (metric) wear plates are used extensively in automotive metal stamping dies. They fully conform to NAAMS specs and are available in plain steel, aluminum bronze with self-lubricating graphite and steel with self-lubricating graphite.

 

Thanks, that’s it! I was ready to believe it was a self-lubricating brake, which of course is nonsensical, but not totally different from what u found.

 

Thank you!

 

That odd one out is a test to see who's OCD enough to avoid it! I know several of my family members who would be annoyed by it.