Accupro 771424 ER32 Collet Chuck CAT40 2-20mm

Product Description

The ACCUPRO 771424 is an ER32 collet chuck with a CAT40 dual contact taper shank, designed for precision tool holding on CNC machining centers. It accepts ER32 collets with a capacity range of 2 mm (0.078 inches) to 20 mm (0.787 inches), making it suitable for a wide range of end mills, drills, and reamers. The chuck features through-coolant capability, supporting both through-spindle and DIN flange coolant delivery. Total indicator runout (TIR) is held to 0.0002 inches (0.005 mm), and the assembly is balanced to 30,000 RPM. Projection from gauge line is 3.13 inches. This chuck is installed by machining center operators and CNC setup technicians in production and job shop environments.

The 771424 is suited for vertical and horizontal CNC machining centers equipped with CAT40 dual contact spindles. The dual contact taper shank engages both the taper and the spindle face simultaneously, improving rigidity and repeatability at higher spindle speeds. Through-coolant support makes it compatible with high-pressure coolant systems used in aluminum, steel, and stainless machining applications. The 3.13-inch projection provides clearance for deep-pocket and multi-axis work without requiring an extension holder.

Key Features

• ER32 collet system with 2 mm to 20 mm (0.078 to 0.787 inches) capacity range
• CAT40 dual contact taper shank for simultaneous taper and face contact
• TIR of 0.0002 inches (0.005 mm) for precision tool holding
• Balanced to 30,000 RPM for high-speed spindle applications
• Through-coolant compatible via through-spindle and DIN flange delivery
• 3.13-inch projection from gauge line for extended reach clearance

Compatibility

Designed for use on CNC machining centers with CAT40 dual contact spindles. Accepts standard ER32 collets. Coolant delivery is compatible with through-spindle and DIN flange coolant systems.

Installation Notes

Installation should be performed by a qualified machining center operator or CNC setup technician. Inspect the spindle taper and chuck shank for nicks, burrs, or contamination before seating the chuck. Torque the drawbar or retention knob according to the machine tool builder specifications, not this chuck alone. Verify TIR at the collet nose with a test indicator after installation before running production parts.