Accupro 778496 ER20 Collet Chuck HSK63A Through Coolant

Product Description

The ACCUPRO 778496 is an ER20 collet chuck designed for CNC machining centers that use an HSK63A hollow taper shank interface. It accepts ER20 collets with a clamping range of 0.0313 to 0.5 inches, covering a wide variety of tool shank diameters in a single chuck body. The 5-inch projection positions cutting tools at reach while maintaining rigidity. Through-spindle coolant capability directs coolant directly to the cutting zone for improved chip evacuation and tool life. The chuck is balanced to 20,000 RPM, making it suitable for high-speed machining operations.

This collet chuck is intended for use in horizontal and vertical CNC machining centers equipped with an HSK63A spindle interface. It is a common choice for production milling, drilling, and reaming operations where through-coolant delivery and high rotational balance are required. Machinists and CNC setup technicians install this chuck in facilities running high-speed spindles where thermal stability and concentricity are priorities. The ER20 collet system is widely used in toolrooms and production environments for its clamping versatility.

Key Features

• ER20 collet system with 0.0313 to 0.5 inches clamping capacity
• HSK63A hollow taper shank for rigid, repeatable spindle engagement
• 5-inch projection for extended tool reach
• Through-spindle coolant compatible for direct coolant delivery to the cutting edge
• Balanced to 20,000 RPM for high-speed machining applications
• TIR of 0.003 mm for precision concentricity

Compatibility

Designed for use with HSK63A spindle interfaces and ER20 series collets on CNC machining centers requiring through-coolant and high-speed balanced toolholding.

Installation Notes

Installation and removal of HSK toolholders should be performed by a qualified CNC machinist or toolroom technician using the spindle manufacturer's recommended clamping procedure. Always power down and lock out the machine spindle before changing toolholders. Verify collet and collet nut seating before torquing to ensure proper tool retention and concentricity. Inspect the HSK63A taper and spindle interface for contamination or damage prior to installation.