Must one wash both hands if he only cut the nails of one hand?<a href="#_ftn1" name="_ftnref1">[1]</a>
Yes.
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<a href="#_ftnref1" name="_ftn1">[1]</a> Piskeiy Teshuvos 4:21; however see Kaf Hachaim 4:86 regarding uncovered areas. [see F Q&amp;A]

Shulchan Aruch HaRav | ❓Must one wash both hands if he only cut the nails of one hand?

Must one wash both hands if he only cut the nails of one hand?[1] Yes. [1] Piskeiy Teshuvos 4:21; however see Kaf Hachaim 4:86 regarding uncovered areas.