Kennametal 4109955 Threading Insert NTF2R KCU25 Carbide

Product Description

The KENNAMETAL 4109955 is a carbide threading insert in the Top Notch series, designed for both internal and external thread-cutting operations on CNC lathes and threading equipment. Manufactured to an NTF insert style with a KCU25 grade carbide substrate, it carries a PVD-applied AlTiN finish that improves wear resistance and heat tolerance at the cutting edge. The insert covers an external pitch range of 0.60 to 1.75 mm (14 to 44 TPI) and an internal pitch range of 1.00 to 2.00 mm (12 to 24 TPI), making it a versatile choice for shops threading a wide range of fastener and fitting profiles. Installation requires a compatible Top Notch toolholder. This insert is sized at Insert Size 2 with a thickness of 3.81 mm (0.15 inches).

This insert is suited for right-hand threading applications across a broad range of ferrous and non-ferrous workpiece materials. The partial profile 60-degree thread standard covers unified and metric thread forms commonly encountered in production machining, maintenance work, and custom fabrication. It is a single-sided insert intended for use in Top Notch series toolholders. Machinists and CNC operators working in job shops, production facilities, or toolroom environments will find the pitch range practical for general-purpose threading across multiple part families without changing inserts frequently.

Key Features

• KCU25 carbide grade with PVD AlTiN coating for extended tool life in threading applications
• Partial profile 60-degree included angle covers both unified and metric thread forms
• External pitch range: 0.60 to 1.75 mm (14 to 44 TPI)
• Internal pitch range: 1.00 to 2.00 mm (12 to 24 TPI)
• Right-hand cut orientation
• Corner radius of 0.08 mm (0.0031 inches) for precise thread root geometry
• Top Notch series insert for secure, repeatable toolholder seating

Compatibility

Designed for use with KENNAMETAL Top Notch series threading toolholders that accept an NTF style, Insert Size 2 threading insert. No specific compatible model numbers were provided in the product data.

Installation Notes

Threading inserts of this type are installed and replaced by a qualified machinist or CNC operator following the machine tool builder and toolholder manufacturer torque and clamping guidelines. Power down and lock out the machine spindle before changing inserts. Handle carbide inserts carefully to avoid chipping the cutting edge, and inspect the toolholder pocket for debris or wear before seating a new insert. Confirm thread pitch selection against the part drawing before starting the cut.