Accupro 775638 ER16 Collet Chuck CAT40 Taper Shank

Product Description

The ACCUPRO 775638 is an ER16 collet chuck with a CAT40 taper shank, designed for precision tool holding in CNC machining centers. It accepts ER16 collets across a clamping range of 0.02 to 0.433 inches and delivers a total indicator runout (TIR) of 0.0002 inches, making it well-suited for close-tolerance drilling, reaming, and light milling operations. The 3.5-inch projection provides clearance for workpiece access. Balanced to 30,000 RPM, this chuck supports high-speed spindle applications. Through-coolant capability is supported via both through-spindle and DIN flange delivery. Weight is 1 pound.

This collet chuck is used in production and job-shop CNC machining environments where consistent tool runout and high-speed performance are required. The CAT40 taper shank is one of the most common spindle interfaces in North American machining centers, making this chuck a standard replacement or additional holder for facilities running ER16 tooling. It is typically installed by machinists or toolroom technicians during tool setup or spindle changeover operations.

Key Features

• ER16 collet system with clamping range of 0.02 to 0.433 inches
• TIR of 0.0002 inches for precise, repeatable tool holding
• CAT40 taper shank for compatibility with standard CNC machining center spindles
• 3.5-inch projection for workpiece clearance in deep-cavity and close-clearance applications
• Through-coolant capable via through-spindle and DIN flange coolant delivery
• Balanced to 30,000 RPM for high-speed cutting applications

Compatibility

Designed for use with CAT40 spindle interfaces accepting ER16 collet chucks. Compatible with ER16 series collets across the stated clamping range. Collet nut diameter is 1.26 inches.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician following the machine tool manufacturer's spindle interface procedures. Power down and lock out the machining center before seating or removing the chuck from the spindle. Use a properly calibrated torque wrench and the appropriate ER16 collet nut spanner when tightening collets to avoid over-torquing or damaging the collet seat. Verify runout with a dial indicator after installation before commencing cuts.