MTECQ UN :  Solid carbide endmills with internal coolant holes and a reduced diameter neck. Used for deep internal, large pitch UN profile threading (up to 3D), on medium and large thread diameters.  
 
 
Internal thread milling COOLANT
  Designation
TPI
Thread
d
D
Flute
ap
H
L
ShankC-Cylindrical
  Grade
  MTECQ 2020F58 16UN  16.0  >=23  20.00  20.00  6  36.60  58.80  105.00  C IC908
  MTECQ 2020E55 12UN  12.0  >=24  20.00  20.00  5  33.90  55.10  105.00  C IC908

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