Selecting the Right Bearing

Thrust and Axial ? both are same.

You mean thrust and Radial.

For this (it all depends on the load) we prefer TRB (single or back to back) when misalignment is not expected and SRB with sight more tolerance for misalignment.

This is for lower speed and heavyliloaded machinery.

In case of higher speed (and in a few lower also) we split these into CRB+TRB or CRB+ball Brg for lower speed and Jrl Brg+ Tilting pad Thrust Brgs for higher speed.

It all depends on your application, the loads and the ratio of the loads.

SKF NUP series if you prefer a sylindrical roller bearing, if you plan to use on both ends of an axle, you can use the NU series on the other end, this way you'll allow thermal expantion

I suppose these days some of ball bearings aren't too bad but still the cone-roller bearing is the way to go, just like in the front wheels of heavy vehicles and tools machines they use.

what's ratio of Axial and Thrust load?

USE A TRAILER HUB THEY HAVE THE TAPERED BEARINGS YOU NEED

Depending on the application and cost there are options.

For low cost and low axial loads deep groove bearings can be used. This is applications like instruments, motors, alternators etc.

For heavier applications like in cars the front wheels use tapered roller bearings.

For even heavier applications like tank turrets tapered roller bearings with alternate rollers providing radial and axial loadings.

Use a bearing manual like SKF catalogue as this lays down the formulae to predict the life of the bearing along with lubrication etc in relation to loads.