Accupro 775248 End Mill Holder BT40 1-1/2 Inch Through Coolant

Product Description

The ACCUPRO 775248 is a BT40 taper shank end mill holder designed for CNC machining centers requiring secure, high-precision toolholding. It accepts a 1-1/2 inch bore and provides a 4.5 inch projection, giving operators clearance for deep-pocket milling operations. The 3 inch nose diameter provides a rigid platform, and the holder is balanced to 30,000 RPM for use in high-speed spindle applications. Through-coolant delivery is supported via both through-spindle and DIN flange coolant types, directing cutting fluid directly to the tool tip. A TIR of 0.0002 inches ensures minimal runout for tight-tolerance work. This holder is installed by CNC setup technicians and machinists in production and job shop environments.

This end mill holder is suited for vertical and horizontal machining centers equipped with BT40 spindle interfaces. The through-coolant capability makes it well matched for applications involving difficult-to-machine materials where heat management at the cutting edge is critical. The M16 x 2.0 drawbar thread is the standard interface for BT40 tooling systems. It is appropriate for high-speed finishing and roughing passes where runout control and balance are priorities.

Key Features

• BT40 taper shank for compatibility with BT40 spindle interfaces
• 1-1/2 inch hole diameter accepts standard end mill shanks
• 4.5 inch projection for extended reach in deep-cavity milling
• Through-coolant support via through-spindle and DIN flange coolant delivery
• Balanced to 30,000 RPM for high-speed machining applications
• TIR of 0.0002 inches for precise, low-runout toolholding

Compatibility

Designed as an OEM-style replacement and standard fitment for BT40 spindle machining centers using M16 x 2.0 drawbar threads.

Installation Notes

Installation should be performed by a qualified CNC machinist or setup technician with the spindle powered down and machine in a safe, locked-out state. Use a torque wrench and the machine manufacturer's specified drawbar torque procedure when seating the holder. Inspect the taper bore and spindle taper for contamination or damage before assembly, as debris will negatively affect TIR. Confirm coolant line connections are secure before resuming spindle operation.