Home Products › Forums › Ask the Engineer › Special tandem tap needed › Reply To: Special tandem tap needed December 2, 2019 at 1:37 pm #72235 heitmanngregParticipant We used to be able to purchase the nuts separately but now they are only available as an assembly. So our cost went from $25 per nut to $350 per assembly. That’s why we want to buy the tap and manufacture the nuts in house.