Collis Tool 85101 End Mill Holder CAT40 1/2 in Bore

Product Description

The COLLIS TOOL 85101 is a CAT40 taper shank end mill holder designed for securing end mills in CNC machining centers and manual milling machines. It accepts a 1/2 inch bore and delivers a 9 inch projection from the spindle face, making it suitable for applications requiring extended reach. The nose diameter measures 7/8 inch, and overall length is 11.687 inches. This holder is a standard tooling component installed by machinists and toolroom technicians in production and job-shop environments where reliable tool retention and runout control are required.

This end mill holder is intended for use in vertical and horizontal CNC machining centers equipped with CAT40 spindle tapers. The 9 inch projection accommodates deep-cavity work and setups where standard-length holders cannot reach the workpiece. The 1/2 inch bore fits a wide range of two-flute and four-flute solid carbide and high-speed steel end mills commonly used in ferrous and non-ferrous milling operations. It is suited to both production shops and maintenance toolrooms running CAT40 equipped machines.

Key Features

• CAT40 taper shank for positive engagement with CAT40 spindle receivers
• 1/2 inch bore diameter accommodates standard end mill shanks
• 9 inch projection for extended reach in deep-cavity or obstructed setups
• 7/8 inch nose diameter provides clearance in close-tolerance fixture environments
• 11.687 inch overall length for consistent gage-line measurements
• No through-coolant design - external coolant application required

Compatibility

Designed for use in machining centers equipped with CAT40 taper spindles and compatible with 1/2 inch shank end mills. Verify spindle interface and drawbar pull-stud specification before installation.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before inserting or removing any toolholder. Use the correct pull-stud and torque the retention knob to the machine manufacturer's specification using an appropriate spanner or toolholder torque fixture. Inspect the taper shank and spindle bore for chips, nicks, or contamination before seating the holder.