Accupro 775666 ER40 Collet Chuck CAT40 Taper Shank

Product Description

The ACCUPRO 775666 is an ER40 collet chuck with a CAT40 taper shank, designed for use in CNC machining centers and milling applications. It accepts ER40 collets with a capacity range of 0.118 to 1.023 inches, covering a wide range of tooling diameters in a single chuck body. The chuck features a 2.5-inch projection and holds a total indicator runout (TIR) of 0.0002 inches, supporting tight-tolerance work. Through-coolant capability is supported via through-spindle and DIN flange coolant delivery. The chuck is balanced to 30,000 RPM, making it suitable for high-speed machining operations. Weighing 1 pound, it is a direct-mount toolholder for machine spindles using the CAT40 interface standard.

This collet chuck is used in CNC vertical and horizontal machining centers equipped with CAT40 spindle interfaces. It is well suited for production shops running high-speed milling, drilling, reaming, or tapping operations where coolant delivery to the cutting zone is required. The ER40 collet system is a widely adopted standard, allowing this chuck to work with the full range of ER40 collets available on the market. Typical users include CNC machinists and toolroom technicians in job shops, production facilities, and aerospace or automotive manufacturing environments.

Key Features

• ER40 collet system with capacity range of 0.118 to 1.023 inches
• CAT40 taper shank for direct mounting in CAT40 spindles
• 2.5-inch projection for standard reach applications
• TIR of 0.0002 inches for precision, tight-tolerance machining
• Through-coolant compatible via through-spindle and DIN flange coolant delivery
• Balanced to 30,000 RPM for high-speed machining

Compatibility

Designed for use with CAT40 spindle interfaces on CNC machining centers. Accepts standard ER40 collets. Compatible with through-spindle and DIN flange coolant systems.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. The machine spindle must be fully stopped and the tool magazine or carousel cleared before mounting or removing the chuck. Use the appropriate CAT40 pull stud and follow the machine tool manufacturer torque specifications for drawbar retention. Verify runout with a dial test indicator after seating the chuck to confirm proper tool holding performance.