1

Thread standard+Normal Diameter+Pitch+Class 

thread size of workpieces 

2

Thread quality control of workpiece     

design the thread dies precision class for end user

3

Thread dies outside diameter and tips

holder inner diameter of thread dies

4

material of workpiece

the chips kinds of workpiece(powders,short,longer chips)

for how to move out chips

5

Through or Blind thread hole of workpiece

select chamfer length and select kinds of flutes

6

the holder kinds of machine spindle

keep the center runout tolerance smaller