This part number is the replacement for the HSD MT1073-140 with 24vdc fan typically used on ShopBot machines.  If your spindle needs replacing, this is likely the unit, but please confirm your spindle part number prior to purchase.
 
Feel free to contact us with your existing spindle serial number, and we can verify compatibility for you on this model.
 
Y6161073B6
18,000rpm
 
Free ground shipping in the Continental United States.  Overnight shipping is $80 in the CONUSA.