Parlec C50-25SM2 Shell Mill Holder CAT50 2.5 Inch Pilot

Product Description

The PARLEC C50-25SM2 is a CAT50 taper shank shell mill holder designed for secure, repeatable mounting of shell mill cutters in CNC machining centers. With a 2.5-inch pilot diameter and a 4.88-inch nose diameter, this holder is sized for heavy-duty face milling applications involving cutters in the 6 to 8 inch diameter range. It delivers a total indicator reading (TIR) of 0.0002 inches, supporting close-tolerance surface finish requirements. The holder is balanced to 30,000 RPM and accepts a 1-14 thread lock screw for positive cutter retention. Machining professionals and CNC setup technicians working with large-diameter shell mills will find this holder suited to production-grade milling operations.

This shell mill holder is intended for use with CAT50 spindle interfaces, which are standard on many full-size vertical and horizontal machining centers used in industrial production environments. The 2.4-inch projection from flange to nose end positions the cutter close to the spindle face, reducing overhang and improving rigidity during aggressive cuts. The lock screw thread size of 1-14 is compatible with the included 25LS lock screw. This holder is appropriate for shops running large-diameter face mills, indexable insert cutters, or other shell-style tooling that requires a pilot-style arbor connection.

Key Features

• CAT50 taper shank for secure spindle engagement on compatible machining centers
• 2.5-inch pilot diameter accommodates shell mills in the 6 to 8 inch cutting diameter range
• TIR of 0.0002 inches for consistent runout control and surface finish quality
• Balanced to 30,000 RPM for high-speed machining applications
• 2.4-inch flange-to-nose projection minimizes overhang for improved rigidity
• 1-14 lock screw thread with 25LS lock screw for positive cutter retention

Compatibility

Designed for use with CAT50 spindle-interface machining centers and shell mill cutters with a 2.5-inch pilot bore in the 6 to 8 inch cutting diameter range. Lock screw thread size is 1-14, compatible with the 25LS lock screw.

Installation Notes

Installation should be performed by a qualified CNC machinist or tooling setup technician. Ensure the machine spindle is fully stopped and locked out before mounting or removing the holder. Clean the CAT50 taper and spindle bore thoroughly before seating to prevent runout caused by contamination. Torque the retention knob and lock screw per the machine tool and cutter manufacturer guidelines; do not exceed the rated values for the spindle or cutter arbor.