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For sale is a Brown and Sharpe milling machine arbor. It includes spacers and end nut and seems to be in a nice condition. It is marked BROWN AND SHARPE 40 7/8" b14-3-1 719-16-1. It has a 7/8" shaft with a keyway. The thickest part of the taper is 44mm (approximate). ID of the internal threads is 13.79 mm (measured with my caliper, approximate).
It is surplus property of Fermilab and seems to have seen little use.