What is the name of the small pins that are used with small wheels / rims? I see that there are at least three different types of axles that can be used with LEGO wheels. I can name the first two — Technic axle and Technic pin — but I cannot name the third, which is like a Technic pin, but smaller.

Note that I've only seen it integrated into a larger part, such as a brick or plate, as shown in the image. I see that BrinkLink sometimes refers to parts like this as having "wheels holder" pins, but that seems to be a term that could apply to the first two types of axles as well.

Does a common and more precise name exist for this type of pin?
LEGO and others sometimes calls those pieces a "bearing element". This term however is not limited to just that axle.

LEGO's replacement parts service calls the holes they go into "HOLE Ø11" (possibly read "Hole Diameter 11"):



The width of the axle is roughly equivalent to the width of a "bar", like the 30374 piece used for Lightsabers as such.

None of these names are particularly satisfactory, but I'm not aware of any better names.