BT-SEM-C :  ISO 3937 shell mill holders with coolant holes and BT MAS-403 ADB tapered shanks.  
 
 
RUNOUT (EXT) 0.005MM (.0002 TAPER HARDNESS 58-60 SURFACE FINISH N5 COOLANT
  Designation
SS
d
D1
L
L2
L1
G
Fig.
  BT40 SEM 27X 45 C  40  27.00  58.0  45.00  21.00  18.0  M16  1
  BT40 SEM 27X100 C  40  27.00  58.0  100.00  21.00  73.0  M16  1
  BT50 SEM 27X 60 C  50  27.00  58.0  60.00  21.00  22.0  M24  1
  BT50 SEM 27X100 C  50  27.00  58.0  100.00  21.00  62.0  M24  1
  BT50 SEM 27X61X320C  50  27.00  61.0  320.00  21.00  282.0  M24  2

(a) For coolant through flange the plug screw must be removed from the flange cooling hole (use a 2 mm hex key).
Balanced to G2.5/BT40=20,000 RPM, BT50=15,000 RPM
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