HSSE ( 3%V )
    Heat treated and heat-resistant steels
    Rm < 1,000 N/mm²
       ( <30 HRC / <290 HB / <145,000 PSI )

   Handtap No. 1 with pilot guide, to assure
   the concentric start at manual threading.
   Tapping only 3-4 threads is enough.
   3 thread chamfer lead.
   Rake angle 6°÷8°.

   Handtap No. 2 with the same thread
   sizes as 108/1.
   3 thread chamfer lead.
   Rake angle 6°÷8°.

   Handtap No. 3 that finishes the thread
   to the required tolerance.
   Not suitable to use as single pass tap.
   3 thread chamfer lead.
   Rake angle 6°÷8°.

   Handtap set consisting of 3 taps:
   108 = 108/1 + 108/2 + 108/3.

   You must tap continuously, it means
   without stop and reversing the tap to
   break the chip.