MT-NPS :  External & internal NPS (American Standard Straight Pipe Thread) full profile thread milling inserts. Used for mechanical joining and pipe fittings.  
 
 
External thread milling Internal thread milling
  Designation
TPI
l
W
S
  Grade
  MT12 18 NPS  18.0  12.00  6.30  2.90 IC908
  MT14 18 NPS  18.0  14.00  7.50  3.10 IC908
  MT14 14 NPS  14.0  14.00  7.50  3.10 IC908
  MT21 14 NPS  14.0  21.00  12.00  4.70 IC908
  MT21 11.5 NPS  11.5  21.00  12.00  4.70 IC908
  MT30 11.5 NPS  11.5  30.00  16.00  5.51 IC908
  MT30 8 NPS  8.0  30.00  16.00  5.51 IC908
  MT40 11.5 NPS  11.5  40.00  20.00  6.30 IC908
  MT40 8 NPS  8.0  40.00  20.00  6.30 IC908

The same insert for external & internal thread.
For cutting speed recommendations, Click on "More Info".
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