Oh, thank goodness someone else has it the same! When it comes to nomenclature and descriptions, I'm never sure that there isn't an opposing "school" of thought!
You know, my formerly tall stack of parts catalogs has dwindled over the years because of the internet, but I often turned to them for just such questions. I'm glad to see that at least some parts manufacturers are keeping the information tradition alive in their electronic publishing.
IOW, I picked up a couple of tidbits browsing the link I hung up above, and I'm an old guy!