Parlec C50-25SM4 Shell Mill Holder CAT50 2.5 in Pilot

Product Description

The PARLEC C50-25SM4 is a CAT50 taper shank shell mill holder designed for use on CNC machining centers requiring secure, high-precision face milling setups. It accepts shell mills with a 2.5-inch pilot diameter and accommodates cutting diameters ranging from 6 to 8 inches. With a total indicated runout (TIR) of 0.0002 inches and a balance rating of 30,000 RPM, this holder delivers the rigidity and accuracy that production machinists and toolroom technicians expect from a premium-grade toolholder. The 4-inch projection from flange to nose end provides adequate clearance for most horizontal and vertical machining applications.

This holder is suited for heavy face milling operations on vertical and horizontal machining centers equipped with CAT50 spindle tapers. It is commonly used in production shops running large-diameter shell mills on steel, cast iron, aluminum, and other structural materials. The included lock screw thread size of 1-14 accepts the corresponding PARLEC 25LS lock screw. No through-coolant feature is present, so coolant delivery must be handled externally or through the machine spindle face if applicable.

Key Features

• CAT50 taper shank for secure fit in standard CAT50 spindle interfaces
• 2.5-inch pilot diameter supports shell mills in the 6 to 8-inch cutting diameter range
• TIR of 0.0002 inches for high-precision face milling applications
• Balanced to 30,000 RPM for compatibility with high-speed spindle operations
• 4-inch projection from flange to nose end provides workpiece clearance in most setups
• Lock screw thread size 1-14 compatible with 25LS lock screw

Compatibility

Designed as an OEM-style toolholder for CNC machining centers with CAT50 spindle tapers, compatible with shell mills having a 2.5-inch pilot bore and cutting diameters from 6 to 8 inches.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and locked out before mounting or removing this holder. Clean both the CAT50 taper and spindle bore thoroughly before seating to prevent runout from contamination. Verify lock screw engagement and holder draw bar torque according to the machine tool manufacturer's specifications before initiating any cutting operation.