Kennametal 4109630 Threading Insert NA3R4 KCU25 4 Tpi

Product Description

The KENNAMETAL 4109630 is a carbide threading insert designed for cutting Acme thread forms at 4 threads per inch (TPI). Part of the Top Notch series, it carries a KCU25 grade designation and an aluminum titanium nitride (AlTiN) finish applied via physical vapor deposition (PVD). The insert handles both internal and external threading operations in a right-hand cutting orientation. At 0.1949 inches thick with a corner radius of 0.0050 inches and a cutting tip width of 0.0874 inches, it delivers consistent thread geometry on Acme profiles. Licensed machinists and CNC operators in metalworking shops are the primary installers of this insert.

This insert is suited for turning applications requiring Acme thread profiles, commonly found in power-transmission components such as lead screws, jack screws, and linear actuators. The 29-degree included angle matches the Acme thread standard for both internal and external applications. The KCU25 carbide grade with AlTiN PVD coating provides wear resistance across a range of ferrous and non-ferrous workpiece materials, making it appropriate for production and job-shop turning environments where Acme thread accuracy is critical.

Key Features

• KCU25 carbide grade with AlTiN PVD finish for enhanced wear resistance
• 4 TPI internal pitch matched to Acme thread standard with 29-degree included angle
• Right-hand cutting orientation for standard lathe setups
• Cuts both internal and external Acme thread forms
• Corner radius of 0.0050 inches for controlled thread root geometry
• Top Notch series insert style for use with compatible Top Notch toolholders

Compatibility

Designed for use in Top Notch series threading toolholders accepting NA-style inserts. Verify toolholder seat and clamp compatibility with insert size 3 Top Notch geometry before installation.

Installation Notes

Installation of threading inserts should be performed by a qualified machinist or CNC operator. Power down and lock out the machine spindle before seating or removing any insert. Ensure the toolholder pocket and clamping surfaces are clean and free of chips before seating the insert. Follow the toolholder manufacturer guidelines for clamping torque and insert orientation to maintain thread accuracy.