Accupro 778410 End Mill Holder HSK63A 1 in Hole

Product Description

The ACCUPRO 778410 is an HSK63A taper shank end mill holder designed for CNC machining centers requiring precise toolholding with minimal runout. The holder accepts a 1-inch bore and features a 4.5-inch projection with a 2-inch nose diameter, providing clearance and rigidity for a wide range of milling operations. Total Indicator Runout (TIR) is rated at 0.003 mm, and the holder is dynamically balanced to 20,000 RPM, making it suitable for high-speed machining applications. Weighing 5.5 pounds, it is built to handle demanding production environments where accuracy and balance consistency are critical.

The 778410 is intended for use in CNC vertical and horizontal machining centers equipped with HSK63A spindle interfaces. The HSK63A connection provides simultaneous taper and face contact, which improves rigidity and repeatability compared to traditional V-flange tooling. The 4.5-inch projection length accommodates extended-reach milling work where shorter holders would cause spindle or fixture interference. This holder is installed by CNC machinists and tool crib technicians in job shop, aerospace, die and mold, and general production machining environments.

Key Features

• HSK63A taper shank with simultaneous taper and face contact for high rigidity and repeatability
• 1-inch bore diameter for compatibility with standard end mills and cutting tools
• 4.5-inch projection length for extended-reach milling operations
• TIR of 0.003 mm for precise, low-runout toolholding
• Balanced to 20,000 RPM for high-speed machining center use
• 2-inch nose diameter provides a robust clamping zone and clearance geometry

Compatibility

Designed for CNC machining centers with HSK63A spindle interfaces accepting a 1-inch bore end mill holder with 4.5-inch projection.

Installation Notes

Installation should be performed by a qualified CNC machinist or tool crib technician with the machine spindle fully powered down and locked out per facility LOTO procedures. Use the appropriate HSK torque wrench and clamping system specific to the machining center spindle; do not hammer or force the holder into the spindle taper. Verify TIR with a dial indicator after seating the holder before beginning any cutting operation. Inspect the HSK shank and spindle bore for contamination or damage prior to each tool change.