Question: what does stk mean on a drawing?
Answer: Per ASME Y14.38z-2002 STK is an abbreviation for STOCK. ASME Y14. 5M-1994 1.4 (a) "Each dimension shall have a tolerance, except for those dimensions specifically identifed as ... or stock (commercial stock size)..." For a stock material the tolerances as defined in the relevant material spec apply.