Accupro 775648 ER20 Collet Chuck CAT40 Taper Shank

Product Description

The ACCUPRO 775648 is an ER20 collet chuck with a CAT40 taper shank designed for CNC machining centers and milling operations. It accepts ER20 collets with a clamping range of 0.039 to 0.511 inches and delivers a total indicator runout (TIR) of 0.0002 inches, making it suitable for precision toolholding applications. The 6-inch projection provides clearance for deep-cavity work. Through-coolant capability supports both through-spindle and DIN flange coolant delivery, extending tool life and improving chip evacuation during high-speed cutting. The chuck is balanced to 30,000 RPM. Machinists and CNC setup technicians install this toolholder in production and job-shop environments.

This toolholder is used in CNC vertical and horizontal machining centers equipped with CAT40 spindle tapers. The 6-inch projection makes it well suited for deep-pocket milling, long-reach drilling, and applications where standard-length holders would cause interference. The ER20 collet system is a widely adopted standard in light-to-medium duty milling and drilling, accommodating a broad range of shank diameters within a single holder. Through-coolant support makes this chuck a practical choice for operations involving difficult materials or elevated cutting speeds where flood coolant alone is insufficient.

Key Features

• ER20 collet system with a capacity range of 0.039 to 0.511 inches
• CAT40 taper shank for direct mounting in CAT40 spindles
• 0.0002 inches TIR for precise, low-runout toolholding
• 6-inch projection for deep-cavity and long-reach applications
• Through-coolant compatible with both through-spindle and DIN flange coolant delivery
• Balanced to 30,000 RPM for high-speed machining operations

Compatibility

Designed for use in CNC machining centers with CAT40 taper spindles and compatible with standard ER20 collets.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle and toolholder taper are clean and free of chips or contamination before seating the chuck. Torque the retention knob to the machine spindle draw bar specification provided by the machining center manufacturer. Verify runout with a dial indicator after installation before beginning any cutting operation.