Accupro 771423 ER32 Collet Chuck CAT40 4 in Projection

Product Description

The ACCUPRO 771423 is an ER32 collet chuck with a CAT40 dual contact taper shank, designed for high-precision CNC milling and machining center applications. It accepts ER32 collets with a capacity range of 2 mm to 20 mm (0.078 inches to 0.787 inches), making it suitable for a wide range of end mills, drills, and reamers. The chuck is balanced to 30,000 RPM and holds a total indicator runout (TIR) of 0.0002 inches (0.005 mm), supporting tight-tolerance work. Through-coolant capability is provided via both through-spindle and DIN flange delivery. The 4-inch projection and 6.687-inch overall length are sized for general-purpose vertical and horizontal machining center use. Machinists and CNC operators install this chuck as a direct toolholder on CAT40 spindle machines.

This collet chuck is intended for use on CNC machining centers equipped with a CAT40 dual contact taper spindle. The dual contact interface engages both the taper and the spindle face simultaneously, improving rigidity and repeatability compared to standard single-contact V-flange toolholders. The 4-inch projection suits a broad range of workpiece setups where moderate reach is needed without sacrificing stiffness. Through-coolant delivery supports chip evacuation and tool life when drilling or milling deep features. This chuck is a fit for production shops, tool rooms, and job shops running CAT40 equipment at high spindle speeds.

Key Features

• ER32 collet system accepts tooling from 2 mm to 20 mm (0.078 inches to 0.787 inches)
• CAT40 dual contact taper shank for increased rigidity and face contact stability
• Balanced to 30,000 RPM for high-speed spindle applications
• TIR of 0.0002 inches (0.005 mm) for precision runout control
• Through-coolant compatible via through-spindle and DIN flange coolant delivery
• 4-inch projection with 6.687-inch overall length for versatile setup reach

Compatibility

Designed for use with ER32 series collets on CNC machining centers with a CAT40 dual contact taper spindle interface.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Power down and lock out the machine spindle before mounting or removing any toolholder. Verify spindle taper and toolholder taper are clean and free of chips or burrs before seating the chuck. Torque the drawbar or retention knob per the machine tool manufacturer specifications, not to a generic value.