Accupro 772140 End Mill Holder CAT50 1/2 Inch Through Coolant

Product Description

The ACCUPRO 772140 is a CAT50 taper shank end mill holder designed for secure tooling retention on CNC machining centers. It accepts a 1/2 inch shank end mill, delivers 6 inches of projection from the spindle face, and supports through-coolant delivery via both through-spindle and DIN flange coolant types. With a total runout (TIR) of 0.0002 inches and a balance rating to 25,000 RPM, this holder suits high-speed finishing and precision profiling operations. Installation requires a 1-8 retention knob thread. It is well suited for shops running high-RPM spindles where tooling concentricity and coolant delivery at the cutting edge are critical.

This end mill holder is used in CNC vertical and horizontal machining centers equipped with CAT50 spindle interfaces. Typical applications include production milling, contouring, and finish profiling in both ferrous and non-ferrous materials. The 6 inch projection allows reach into deeper pockets or fixtures where standard short-projection holders would cause spindle or toolholder interference. The 1-3/8 inch nose diameter and 1-1/2 inch clamping depth provide solid radial support for the tool shank under high cutting loads.

Key Features

• CAT50 taper shank for direct spindle mounting on compatible CNC machining centers
• 1/2 inch bore accepts standard end mill shanks with 1-1/2 inch clamping depth
• 6 inch projection for extended reach into deep pockets or tall fixtures
• Through-coolant capable with support for through-spindle and DIN flange coolant delivery
• TIR of 0.0002 inches for high-precision concentricity at the cutting edge
• Balanced to 25,000 RPM for high-speed machining applications

Compatibility

Designed for CNC machining centers with a CAT50 taper spindle interface and a 1-8 retention knob thread. Accepts 1/2 inch shank end mills.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Ensure the spindle is fully powered down and the machine is in a safe lockout state before mounting or removing the holder. Clean both the CAT50 taper and the spindle bore thoroughly before seating to ensure full contact and accurate runout. Use the correct torque specifications for the 1-8 retention knob as specified by the machine tool manufacturer.