Accupro 775352 End Mill Holder R8 Taper Shank

Product Description

The ACCUPRO 775352 is an R8 taper shank end mill holder designed for use in milling machines equipped with an R8 spindle. It accepts a 3/4-inch tool shank and provides a 2.37-inch projection from the spindle face, giving clearance for a wide range of milling operations. The holder is precision-ground to a TIR (Total Indicator Runout) of 0.0002 inches, supporting accurate, repeatable cuts. The drawbar thread is 7/16-20, which matches standard R8 spindle drawbar configurations. Machinists and toolroom technicians install this holder to secure end mills, slot drills, and similar shank tooling in manual and CNC knee mills.

This end mill holder is suited for manual knee mills, Bridgeport-style machines, and similar equipment that use the R8 taper spindle standard. It is appropriate for general machining environments including job shops, toolrooms, and maintenance facilities. The 3/4-inch bore accommodates common end mill shank sizes used in ferrous and non-ferrous material removal operations. Through-coolant is not supported on this holder, making it best suited for air blast or flood coolant applied externally at the cutting zone.

Key Features

• R8 taper shank for direct mounting in R8-spindle milling machines
• 3/4-inch bore diameter accepts standard end mill shanks
• 2.37-inch projection provides clearance for workpiece and fixture access
• TIR of 0.0002 inches for precise, low-runout tool holding
• 7/16-20 drawbar thread matches standard R8 spindle drawbar
• No through-coolant — compatible with external flood or air blast cooling

Compatibility

Designed as an OEM-style replacement and standard tooling option for milling machines with an R8 taper spindle and a 7/16-20 drawbar thread.

Installation Notes

Installation is performed by machinists or toolroom technicians. Power down and lock out the machine spindle before inserting or removing the holder. Insert the R8 taper into the spindle bore, align the keyway, and tighten the drawbar to secure the holder — do not over-torque the drawbar as this can damage the taper or drawbar thread. Confirm TIR with a test indicator after installation before beginning any cutting operation.