Accupro 778502 ER32 Collet Chuck HSK63A Through Coolant

Product Description

The ACCUPRO 778502 is an ER32 collet chuck designed for precision CNC milling and machining centers that use an HSK63A hollow taper shank interface. It accepts ER32 collets with a clamping capacity range of 0.0625 inches to 0.7813 inches, covering a wide array of cutting tool shank sizes. The chuck features a 4-inch projection from the gauge line and is built with through-coolant capability, directing coolant fluid through the spindle and directly to the cutting edge. It is balanced to 20,000 RPM and holds a total indicator runout (TIR) of 0.003 millimeters, making it suitable for high-speed, high-precision applications.

This collet chuck is used in CNC machining centers equipped with HSK63A spindle interfaces. Typical applications include high-speed milling, drilling, reaming, and tapping operations in production environments where both precision and coolant delivery at the tool tip are required. The 4-inch projection suits applications where extended reach into a workpiece or fixture clearance is needed. Through-spindle coolant compatibility makes it well suited for deep-hole drilling and hard-material cutting where heat management at the cutting zone is critical.

Key Features

• ER32 collet system with capacity range of 0.0625 to 0.7813 inches
• HSK63A hollow taper shank for rigid, repeatable spindle connection
• Through-coolant design directs fluid directly to the cutting tool tip
• 4-inch projection for extended reach applications
• Balanced to 20,000 RPM for high-speed spindle compatibility
• TIR of 0.003 mm for tight tolerances in precision machining

Compatibility

Designed for use in CNC machining centers with an HSK63A spindle interface. Accepts standard ER32 series collets.

Installation Notes

Installation and removal of HSK tooling should be performed by a qualified CNC machinist or tooling technician with the spindle at a complete stop and all machine power isolated. Use the appropriate HSK chuck key and torque the collet nut per the collet manufacturer's specification for the collet size in use. Verify coolant port alignment with the machine spindle before clamping. Inspect the taper bore and the spindle taper for nicks, chips, or contamination before seating the chuck.