ST-ER :  DIN 6499 ER collet chucks with straight shanks.  
 
 
RUNOUT (INT) 0.005MM (.0002 HARDNESS 58-60 SURFACE FINISH N5 COOLANT
  Designation
SS
CSI		 d
min		 d
max
L2
L
J
D3
T
Fig.
Kg
  ST 20X 50 ER20 F  20  ER20  1.0  13.0  50.00  42.50  M12  34.00  22.0  1  0.15
  ST 25X100 ER20  25  ER20  1.0  13.0  100.00  36.00  M16  34.00  22.0  1  0.30
  ST 25X150 ER20  25  ER20  1.0  13.0  150.00  36.00  M16  34.00  22.0  1  0.39

F suffix indicates a flat on the shank.
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