Kennametal 4109627 Threading Insert NA3L6 KCU25 Carbide

Product Description

The KENNAMETAL 4109627 is a carbide threading insert in the Top Notch series, designed for cutting Acme threads at 6 threads per inch (TPI) with a 29-degree included angle. The insert carries a KCU25 manufacturer grade and features an aluminum titanium nitride (AlTiN) finish applied via PVD coating. Configured for left-hand operation, it is suited for both internal and external thread-cutting applications. Machinists and CNC lathe operators use this insert in production environments where consistent thread form and wear resistance are critical. The cutting tip width measures 0.0567 inches (1.44 mm), and the corner radius is 0.005 inches (0.13 mm).

This threading insert is intended for use in Top Notch compatible toolholders on CNC lathes and manual turning centers. It is well suited for shops producing Acme-threaded components such as lead screws, power screws, and linear motion hardware. The left-hand orientation makes it the correct choice when thread direction or machine setup requires reverse-hand cutting. Both internal and external thread profiles are supported, giving the insert flexibility across multiple setups within the same grade and geometry.

Key Features

• KCU25 carbide grade with AlTiN PVD coating for extended tool life in steel and alloy applications
• Acme thread form at 6 TPI with a 29-degree included angle for accurate thread geometry
• Left-hand insert orientation for reverse-direction threading operations
• Supports both internal and external thread cutting in a single insert style
• Top Notch series design for secure, repeatable seating in compatible toolholders
• Compact geometry with 0.005-inch corner radius for sharp, defined thread root control

Compatibility

Designed for use in Top Notch series toolholders that accept size 3 inserts. No additional specific model or part number compatibility data was provided in the product input.

Installation Notes

This insert is installed and serviced by machinists or CNC tooling technicians. Power down and lock out the machine spindle before changing inserts. Use the appropriate Top Notch torque key or clamping hardware to seat the insert fully against the pocket — do not substitute with non-rated fasteners. Confirm thread hand and insert orientation match the programmed toolpath before resuming cuts.