DIN69871-ER (form AD or B) :  DIN 6499 ER collet chucks with a DIN 69871 form AD/B taper shanks.  
 
 
RUNOUT (INT) 0.003MM(.00012 TAPER HARDNESS 58-60 SURFACE FINISH N5 SK30,50-G6.3=12000RPM @ SK40-G2.5=20000RPM COOLANT
  Designation
SS
CSI		 d
min		 d
max
L
L1
L3
D3
D2
G
J
Kg

B is the designation for coolant through flange.
DIN69871 30 Balanced to G6.3 at 12,000 RPM.
DIN69871 40 Balanced to G2.5 at 20,000 RPM.
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