GTI ER-ST (tapping) :  DIN 6499 ER tapping attachments with straight shanks.  
 
 
HARDNESS 58-60 SURFACE FINISH N5
  Designation
SS
CSI		 Tap
min		 Tap
max		 d
min		 d
max
D3
D1
L1
L
L2
Flf
Flb
Kg
  GTI ER20 ST20X80  ST20  ER20  M4  M14  1.0  13.0  34.00  33.5  28.0  49.00  80.00  8.0  3.0  0.35

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