Accupro 771840 Shrink-fit Tool Holder CAT40 3/16 Inch

Product Description

The ACCUPRO 771840 is a shrink-fit tool holder designed for CNC machining centers using the CAT40 taper interface. It accepts tooling with a 3/16 inch shank diameter and delivers a 3.15 inch projection from the gauge line, giving machinists reliable reach for a range of milling and drilling operations. The holder achieves clamping through thermal interference fit, requiring an induction or open-flame shrink-fit unit for tool installation and removal. With a balanced rating of 30,000 RPM, it is suitable for high-speed spindle applications where runout control and dynamic balance are critical. Licensed machinists and CNC setup technicians are the primary installers of this tooling component.

This holder is intended for use in vertical and horizontal machining centers equipped with CAT40 spindle tapers. It suits high-speed finishing and semi-finishing operations where minimal runout is required. The 3/16 inch bore accommodates end mills, drill blanks, and solid carbide tooling of the corresponding shank diameter. A clamping depth of 0.47 inches provides adequate tool engagement for secure holding at elevated spindle speeds.

Key Features

• CAT40 taper shank for direct spindle mounting on standard machining centers
• 3/16 inch bore diameter matched to 3/16 inch shank tooling
• 3.15 inch overall length and 3.15 inch projection for extended reach applications
• Balanced to 30,000 RPM for high-speed spindle compatibility
• 0.47 inch clamping depth provides solid tool engagement in the bore
• Nose diameter of 0.59 inches supports clearance in tight workpiece geometry
• No through-coolant configuration — external coolant delivery required

Compatibility

Designed for use in machining centers with a CAT40 spindle taper interface accepting standard V-flange tooling.

Installation Notes

Shrink-fit tool holders require a dedicated induction heating or shrink-fit station to expand the bore before tool insertion or removal — never force tooling into or out of the bore without proper thermal equipment. Ensure the spindle and holder are free of chips, coolant residue, and burrs before seating in the machine. Allow the holder and installed tool to return fully to ambient temperature before mounting in the spindle. Installation should be performed by qualified CNC machinists or tooling technicians following the machine tool manufacturer's toolholder torque and draw-bar specifications.