YINETTECH 1 Pack R8 to JT6 Drill Chuck Arbor Adapter 7/16-20 Thread compatible with Bridgeport R8 Spindle

["R8 to JT6 adapter compatibility: fits R8 spindle mills and JT6 drill chucks; compatible with Bridgeport knee mills, compatible with Jet R8 mills, compatible with Grizzly R8 machines for quick chuck changes.","Drill chuck arbor design: alloy steel body with precision ground JT6 taper and R8 shank; 7/16-20 UNF drawbar thread provides secure retention and concentric alignment for accurate drilling on milling machines.","Milling machine conversion: converts an R8 spindle to accept JT6 keyed drill chucks, enabling drilling, reaming, and light boring operations without swapping tool holders or removing existing spindle tooling.","Runout control notes: JT6 male taper seats smoothly in matched chucks; apply light oil on the taper; verify R8 spindle cleanliness and 7/16-20 drawbar length to achieve stable clamping during operation.","Workshop application range: suitable for home garage mills, vocational classrooms, maintenance departments, prototype labs, and fabrication shops requiring frequent chuck changes and precise hole making."]