ER-SPR :  DIN 6499 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 .0004 HARDNESS 46-48 SURFACE FINISH N5
  Designation
SS		 d2
min		 d2
max
  ER25 SPR 15-16  ER25  15.00  16.00
  ER32 SPR 15-16  ER32  15.00  16.00
  ER32 SPR 16-17  ER32  16.00  17.00
  ER40 SPR 15-16  ER40  15.00  16.00
  ER40 SPR 16-17  ER40  16.00  17.00
  ER50 SPR 14-16  ER50  14.00  16.00
  ER50 SPR 16-18  ER50  16.00  18.00

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