Kennametal 4109957 Threading Insert NTF3R KCU25 Carbide

Product Description

The KENNAMETAL 4109957 is a carbide threading insert designed for precision thread cutting on both internal and external workpieces. Manufactured to the NTF3R insert style within the Top Notch series, it carries the KCU25 grade designation and an AlTiN finish applied via PVD coating. The insert cuts partial profile 60-degree threads and handles external pitches from 0.60 to 2.50 mm (10 to 44 TPI) and internal pitches from 1.00 to 2.50 mm (9 to 24 TPI). It is a right-hand insert with a corner radius of 0.08 mm (0.0031 inches) and a thickness of 4.95 mm (0.195 inches). Machinists and CNC lathe operators working in production threading applications install this insert.

This insert is suited for threading operations on CNC turning centers and manual lathes where consistent thread form and tool life are required. The Top Notch series is a common platform in production shops for both internal and external threading on a range of materials. The KCU25 grade with AlTiN PVD coating is appropriate for threading ferrous and non-ferrous materials where heat resistance and edge retention are priorities. The partial profile 60-degree thread standard covers a wide range of metric and unified thread forms.

Key Features

• Carbide substrate with AlTiN finish applied by PVD coating process
• Cuts both internal and external threads from a single insert style
• External pitch range: 0.60 to 2.50 mm (10 to 44 TPI)
• Internal pitch range: 1.00 to 2.50 mm (9 to 24 TPI)
• Partial profile 60-degree included angle for broad thread form coverage
• Right-hand cutting geometry, Insert Size 3, Top Notch series toolholder platform

Compatibility

Designed for use in Top Notch series threading toolholders that accept Size 3 NTF-style inserts for partial profile 60-degree thread cutting applications.

Installation Notes

Installation is performed by qualified machinists or CNC setup technicians. The machine spindle must be stopped and all motion arrested before seating or replacing the insert. Use the appropriate Top Notch clamping screw and torx key per toolholder manufacturer guidelines to secure the insert. Inspect the insert pocket and clamping components for wear or damage before each insert change.