Has anyone found the basic "hand damage" CR for PC's and monsters?

I don't think there is one. It's either 'none', or you can arm them with a hand weapon.

I suppose, if a creature had claws and you thought they should have a CR, then you could use the CR for a standard hand weapon, which is 3.

actually I meant DR (damage rating) not CR (critical rating)

the old editions had regular hand damage at s-4 I think

I am really looking for claw damage and hand damage for unarmed combat

Hmm... Well, I guess since regular damage is Strength+DR, unarmed would be just Strength. Monster claw damage is built into the stat line. When in doubt, I try to go with the simplest explanation - that usually turns out to be the right way (though I have been wrong).

Ah!

Page 74 of the main Rulebook, second last entry in Table 9-5: "Melee Weapons"

Unarmed, DR 3, CR 4, Group: unarmed, no other effects!

It is very hidden, I have to admit.