1

Thread standard+Normal Diameter+Pitch+Class 

thread size of workpieces 

2

Thread quality control of workpiece     

design the thread taps precision class for end user

3

Thread length of workpiece

cutter length + overall length of taps

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 collet kinds of machine spindle

JIS collet, DIN tap collet, mills parallel collet, ER collet, Side fix holder