Expanding Mandrels | McMaster-Carr
Expanding-End Lathe Mandrel Sets. An expanding screw widens the end of the mandrel for a tight hold on the inside of a workpiece. These mandrels are machinable to fit the exact ID of your part. Mandrels are also known as arbors. One 1 1/4 " OD × 1" Shank Dia × 4" Lg. Expanding-End Mandrel.
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