ER-SPR-AA :  DIN 6499 'AA' ultra precise ER spring collets with HARD TOUCH coating which increases wear resistance, improves corrosion protection, prolongs the surface finish quality and maintains longer run-out accuracy.  
 
 
CONCENTRICITY .0002 HARDNESS 46-48 SURFACE FINISH N5
  Designation
SS		 d2
min		 d2
max
  ER32 SPR 19-20 AA  ER32  19.00  20.00
  ER40 SPR 19-20 AA  ER40  19.00  20.00
  ER40 SPR 20-21 AA  ER40  20.00  21.00

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