Kennametal 4109960 Threading Insert Size 3 Ntk KCU25 Carbide

Product Description

The KENNAMETAL 4109960 is a solid carbide threading insert designed for precision thread-cutting operations on CNC lathes and turning centers. Manufactured in the NTK style with KENNAMETAL KCU25 grade carbide and an AlTiN finish applied via PVD coating, this insert handles both internal and external threading at a partial profile 60-degree included angle. It covers an external pitch range of 0.60 to 2.50 mm (10 to 44 TPI) and an internal pitch range of 1.00 to 2.50 mm (9 to 24 TPI). The left-hand insert geometry is suited for specialized threading applications where standard right-hand tooling is not appropriate. Machinists and CNC programmers working in job shops, production facilities, and maintenance environments will find this insert compatible with Top Notch series toolholders.

This insert is sized at Insert Size 3 and fits into the Top Notch series tooling system. It is used for threading both internal bores and external diameters on a wide range of ferrous and non-ferrous workpieces. The partial profile 60-degree thread form makes it suitable for metric and unified thread standards within its pitch range. The AlTiN PVD coating improves heat resistance and wear life, particularly in dry or low-coolant cutting conditions. It is installed by qualified machinists and toolroom technicians following the toolholder manufacturer's seating and clamping procedures.

Key Features

• Solid carbide KCU25 grade construction for wear resistance in threading applications
• AlTiN finish via PVD coating for improved heat resistance and tool life
• Covers external pitch 0.60 to 2.50 mm (10 to 44 TPI) and internal pitch 1.00 to 2.50 mm (9 to 24 TPI)
• Partial profile 60-degree included angle for metric and unified thread forms
• Left-hand insert geometry for specialized threading setups
• Fits Top Notch series toolholders, Insert Size 3

Compatibility

Designed for use with Top Notch series threading toolholders accepting an Insert Size 3 NTK style insert. Suitable for both internal and external threading operations within the stated pitch ranges.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and de-energize the machine spindle before changing inserts. Seat the insert fully into the toolholder pocket and torque the clamping screw according to the toolholder manufacturer's specifications. Verify insert orientation for left-hand cutting direction before resuming operation.