Accupro 775684 ER20 Collet Chuck CAT50 Taper Shank

Product Description

The ACCUPRO 775684 is an ER20 collet chuck with a CAT50 taper shank, designed for use in CNC machining centers where tool-holding precision and rigidity are critical. It accepts ER20 collets with a capacity range of 0.039 to 0.511 inches, making it compatible with a wide range of cutting tool shank diameters. The chuck features a 4-inch projection from gauge line, a total indicator runout (TIR) of 0.0002 inches, and is balanced to 25,000 RPM. Through-coolant capability allows coolant delivery directly through the spindle or via DIN flange, supporting high-speed and high-precision machining operations. Installation is performed by qualified machinists and CNC setup technicians.

This collet chuck is suited for CNC vertical and horizontal machining centers equipped with CAT50 spindle interfaces. The ER20 collet system accommodates a broad range of end mills, drills, reamers, and taps within its capacity range. The 4-inch projection makes it appropriate for applications requiring clearance from the spindle face, such as deep-pocket milling or tall workpiece fixturing. The through-coolant design supports chip evacuation and thermal control in demanding cutting conditions.

Key Features

• ER20 collet system with 0.039 to 0.511 inch capacity range
• CAT50 taper shank for compatibility with standard CAT50 spindle interfaces
• 0.0002 inch TIR for high-precision tool holding
• 4-inch projection from gauge line for extended reach applications
• Through-coolant compatible via through-spindle and DIN flange coolant delivery
• Balanced to 25,000 RPM for high-speed machining

Compatibility

Designed for use with CNC machining centers equipped with a CAT50 spindle taper. Accepts standard ER20 collets. Collet nut diameter is 1.38 inches.

Installation Notes

Installation and tool changes should be performed by a qualified machinist or CNC setup technician with the machine powered down and the spindle fully stopped. Use the appropriate ER20 collet nut wrench and spanner to achieve proper clamping torque per the collet manufacturer guidelines. Verify through-coolant connections and sealing before operation at elevated RPM. Inspect TIR at initial setup and after any tool change to confirm runout is within tolerance for the application.