ER20 Collet Clamping Range 3,6 and 8mm Super Precision with Runout less than or equal to 0.005mm at 4xD, 21mm Outside Diameter 31.5mm Long.
0.005mm runout collets should only be used to grip the nominal diameter if used for smaller diameter runout will increase and collet life will be shortened. Runout is defined using a high precision master collet chuck.
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