Kennametal 3641525 Shell Mill Holder CAT40 1.25 Inch Pilot

Product Description

The KENNAMETAL 3641525 is a CAT40 taper shank shell mill holder designed for securing shell mills and face mills in machining centers. It features a 1.25-inch pilot diameter and a projection from flange to nose end of 2.12 inches, giving machinists a predictable tool offset for setup. Overall length is 5.495 inches. The holder is balanced to 12,000 RPM, making it suitable for modern vertical and horizontal machining centers running at moderate to high spindle speeds. Lock screw thread size is 5/8-18. This type of toolholder is installed by CNC machinists and toolroom technicians as part of a modular cutting tool assembly.

This shell mill holder is intended for use in machining centers equipped with a CAT40 spindle interface. It is well suited for face milling, shoulder milling, and other operations where a shell mill or indexable face mill is mounted directly to the spindle. Typical applications include production milling of steel, aluminum, and cast iron workpieces in job shop and high-volume manufacturing environments. The 1.25-inch pilot accommodates shell mills with a matching bore diameter.

Key Features

• CAT40 taper shank for direct spindle mounting on standard machining centers
• 1.25-inch pilot diameter for positive shell mill seating
• 2.12-inch projection from flange to nose end for consistent tool length setup
• Balanced to 12,000 RPM for stable high-speed operation
• 5/8-18 lock screw thread for secure cutter retention
• Overall length of 5.495 inches for straightforward gage length calculation

Compatibility

Designed as an OEM-style shell mill holder for machining centers with a CAT40 spindle taper interface and shell mills with a 1.25-inch pilot bore.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician. Power down and lock out the machining center spindle before mounting or removing the toolholder. Use a proper CAT40 retention knob torqued to the machining center manufacturer specification, and verify tool assembly balance and runout with a dial indicator before returning the spindle to full operating speed. Follow applicable machine tool safety standards for toolholder installation and cutter retention.