Kennametal 4175985 Threading Insert NTF3R KCU10 Carbide

Product Description

The KENNAMETAL 4175985 is a carbide threading insert in the Top Notch series, designed for cutting both internal and external threads on CNC lathes and manual turning centers. The insert carries the KCU10 grade with a PVD-applied AlTiN finish, which supports elevated cutting speeds and provides wear resistance in a wide range of workpiece materials. It covers an external pitch range of 0.60 to 2.50 mm (10 to 44 TPI) and an internal pitch range of 1.00 to 2.50 mm (9 to 24 TPI), making it a versatile single insert for shops running mixed threading operations. The 60-degree partial profile geometry produces threads across multiple thread standards without requiring a dedicated insert for each pitch. Machinists and CNC operators install this insert into compatible Top Notch toolholders.

This insert is suited for production threading on lathes in job shops, aerospace component machining cells, and general metalworking environments. The right-hand cutting direction and NTF insert style position it for standard threading applications where a 60-degree included angle is required. The insert size 3 designation matches it to the Top Notch size 3 toolholder family. It handles both internal threading operations such as tapped bores and external threading on turned shafts and studs across the supported pitch range.

Key Features

• KCU10 carbide grade with PVD AlTiN finish for wear resistance at elevated cutting speeds
• 60-degree partial profile geometry covers multiple thread standards in one insert
• 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)
• Right-hand cutting direction, NTF insert style
• Top Notch series — indexes into compatible Top Notch size 3 toolholders

Compatibility

Designed for use with Top Notch series size 3 threading toolholders that accept the NTF insert style. No specific compatible toolholder part numbers were provided in the product data.

Installation Notes

Installation is performed by CNC machinists or lathe operators with the machine fully stopped and in a safe, locked-out state before changing inserts. The insert seats into the Top Notch toolholder pocket and is secured per the toolholder manufacturer torque guidance. Verify insert orientation and hand before resuming cutting. Handle carbide inserts carefully to avoid chipping the cutting edge prior to use.