Brass-aluminum bearing thrusts

Aluminium as a bearing surface is a new one to me!

Aluminium -Bronzes are Bearing materials. Radial or Thrust.

Brass Never.PlainAluminium Never. Both might Sieze at stresses at which bearings operate.

I don't know what you mean by aerospace application. That is a very broad spectrum. Brass and aluminum are sometimes used together in tooling applications to prevent galling which would occur with aluminum to aluminum or brass to brass. In this type of application I would use 7075 aluminum instead of 6061. It is better suited to wear applications and is much harder than 6061. Even better if you can get it in T8 heat treat condition. Better yet with either alloy have it hard anodized. Don't make your brass part until after you get the aluminum part back from anodize because the surface buildup can vary from .0001 to .0007 per surface. Beyond that the anodize process begins to eat up the aluminum rather than build it up. The hard anodized surface should be about 60rc hardness, with a hard shell thickness of about .0015max. You will still need lubrication appropriate to your application.

Have you thought about using plastic in this environment instead of aluminum? Delrin AF is always good for bearing and wear situations along with MC 901 Nylon. Since Delrin AF does contain some PTFE (Teflon) it should seal up rather nicely in a threaded male/female situation.

What's using condition of this pair?

Temperate,thrust load and movement frequency?

simple surggestion for this pair is aluminum 6061 and bronze(aluminum base).