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
Related tool for : ER40 SPR .553-.593 AA
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