ERH-A-HS (HSS) :  3-5 flute, 30° helix, medium length roughing HSS endmills.  
 
 
Counter boring Helical interpolation Ramp down Shouldering Slotting
  Designation
D
Flute
d
ap
L
Ha°
Shank
  Grade
  ERH-A4 20-38W20-104 HS  20.00  4  20.00  38.00  104.00  30.0  W MPC
  ERH-A5 22-38W20-104 HS  22.00  5  20.00  38.00  104.00  30.0  W MPC

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