Accupro 771820 ER32 CAT40 Collet Chuck Through Coolant

Product Description

The ACCUPRO 771820 is an ER32 collet chuck with a CAT40 dual contact taper shank, designed for precision CNC milling and machining center applications. It accepts ER32 collets across a capacity range of 0.078 to 0.787 inches, providing flexibility for a wide range of tool shank diameters. The chuck features through-spindle coolant delivery and a maximum runout (TIR) of 0.0003 inches, making it suited for tight-tolerance work. It is balanced to 30,000 RPM, supporting high-speed machining operations. Projection from the spindle face measures 0.75 inches. Machinists and CNC setup technicians install this chuck in standard CAT40 spindle toolholding systems.

This collet chuck is used in vertical and horizontal machining centers equipped with CAT40 spindle interfaces. The dual contact taper shank engages both the taper and the spindle face simultaneously, improving rigidity and reducing runout compared to standard single-contact toolholders. Overall length is 3.4375 inches (3-7/16 inches) with a shank length of 2.6875 inches (2-11/16 inches). It is well suited for production milling, drilling, reaming, and tapping operations where tool rigidity and coolant delivery to the cutting zone are required.

Key Features

• ER32 collet system with 0.078 to 0.787 inch capacity range covers a broad selection of tool shank sizes
• CAT40 dual contact taper shank provides simultaneous face and taper contact for increased rigidity
• TIR of 0.0003 inches (0.007 mm) supports precision and close-tolerance machining
• Balanced to 30,000 RPM for high-speed spindle compatibility
• Through-spindle coolant delivery directs coolant directly to the cutting tool
• 0.75 inch projection keeps toolholder compact for improved clearance in tight setups

Compatibility

Designed as an OEM-style toolholder for machining centers with CAT40 dual contact spindle interfaces. Accepts standard ER32 collets. No specific machine model compatibility was provided in the product data.

Installation Notes

Installation is performed by a qualified machinist or CNC technician. Power down and lock out the machining center before inserting or removing the toolholder from the spindle. Use a calibrated torque wrench and the appropriate ER32 collet nut spanner when seating collets to ensure proper clamping force. Confirm TIR with a dial test indicator after installation before beginning any cutting operation.