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

Drill size of thread hole

select thread mill diameter for high stiffness

6

Inner, outer thread

Select internal or External thread mills

7

the collet kinds of machine spindle                           mills parallel collet, ER collet, Side fix holder