[winrid]

Screws have different thread and pitch sizes. An app won't read that correctly. You can get a tool to measure the size/thread/pitch. I have containers with lots of slots and I label each slot, so I have many dozens of types of metric/imperial screws sorted.

It's actually hundreds of screws, bolts, and nuts, I did the sorting as a relaxing week while watching some shows :D

[ThinkBeat]

I will have to check that out, thank you

[temporarely]

https://www.amazon.com/s/?ie=UTF8&keywords=metric+socket+hea...

Someone mentioned M* screws and that got me searching to find out what it is and then ended up on the above amazon page. So I like the indexing scheme there and question OP that it can't be done by image and machine learning. Basically, all those indexes [minus material which you can just select] should be trivially recognizable and that just leaves the precision measures.

[winrid]

For sure! I think I have these [0].

[0] https://www.amazon.com/tenluno-Checker-SWTC-44-MaleFemale-Id...

[doctorhandshake]

What is this tool called?

[CapitalistCartr]

Thread checker.