In article , no spam says...

The inner races are clamped together with a locknut, is that the proper
condition for back to back mounting?

For angular contact pairs, whether back to back or face to face,
the outer races and inner races *must* be clamped together.

The inners via the spindle nut and whatever spacers stack
happens to be there, the outers typically by clamping them
in a bored recess with a clamp ring.

In both ff and bb mounting, you will see that locknut. You cannot
determine a priori one vs the other because of its presence.

Jim


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