Kennametal 4109946 Threading Insert NT3RCK KCU25 Carbide

Product Description

The KENNAMETAL 4109946 is a carbide threading insert in the NT3RCK geometry, manufactured to KCU25 grade with a PVD-applied AlTiN finish. Designed for both internal and external thread cutting, it produces 60-degree partial profile threads across a pitch range of 2.50 to 4.00 mm (6 to 11 TPI) externally and 4.00 mm (6 TPI) internally. The K chipbreaker geometry aids in chip control during threading operations. At 0.195 inches thick with a corner radius of 0.0134 inches (0.34 mm), this insert seats into Top Notch series toolholders and is suited for machinists and CNC turning specialists working in production threading environments.

This insert is appropriate for threading operations on CNC lathes and turning centers in both job shop and production settings. The AlTiN coating provides thermal resistance suited to dry or near-dry machining conditions on steels and similar materials. The right-hand orientation and 60-degree included angle make it a standard choice for unified and metric thread profiles on external workpiece diameters and internal bores within the listed pitch range.

Key Features

• KCU25 carbide grade with PVD AlTiN finish for heat and wear resistance
• 60-degree partial profile geometry for both internal and external threading
• External pitch range: 2.50 to 4.00 mm (6 to 11 TPI); internal pitch: 4.00 mm (6 TPI)
• K chipbreaker for controlled chip evacuation during threading cuts
• Right-hand cutting orientation, Insert Size 3
• Tip-to-top height of 0.0980 inches; thickness of 0.195 inches

Compatibility

Designed for use with Top Notch series threading toolholders that accept NT (Top Notch) style inserts of size 3. Verify toolholder insert-size designation and clamping style before installation.

Installation Notes

Threading inserts of this type are installed and changed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before seating or removing the insert. Use the correct torque driver or wrench specified by the toolholder manufacturer for the clamping screw - do not overtighten, as carbide inserts are brittle and will crack under uneven clamping load. Confirm insert orientation and pitch selection against the job print before running the first threading pass.