Item description : Size : 1/8 '' 3/16 '' 1/4 '' 5/16 '' 3/8 '' 7/16 '' 1/2 '' 9/16 '' 5/8 '' 11/16 '' 3/4 '' 13/16 '' 7/8 '' Accuracy .0006 '' TIR Drawbar Thread : 7/16 '' -20 Material : 65Mn Hardness : Clamping part HRC 55-60 flexible part HRC 40-45 applicatory : This unit is applicatory to all sorts of milling machines, which spindle taper hole is.
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