Kennametal 1183781 NTU4R KC850 Carbide Turning Insert

Product Description

The KENNAMETAL 1183781 is a carbide threading insert designed for external thread turning operations. It carries the KC850 manufacturer grade and features a CVD-applied TiC/TiCN/TiN multilayer coating that promotes wear resistance and thermal stability during continuous threading cuts. The insert follows a partial profile 60-degree thread standard and is suited for cutting threads in the 1.25 mm to 6.25 mm pitch range, covering 4 to 20 TPI. Right-hand cutting geometry and a 0.11 mm corner radius (approximately 0.0043 inch) define the cutting edge profile. This insert is part of the Kennametal Top Notch series and is installed by machinists and CNC turning specialists in production and job-shop environments.

The 1183781 fits external threading applications on CNC lathes and manual turning centers where the Top Notch toolholder system is in use. Its 60-degree included angle makes it appropriate for Unified National (UN) and metric partial-profile thread forms. Typical applications include threading steel, stainless steel, and similar materials where CVD-coated carbide provides adequate tool life. This insert is sold individually per package with a minimum order quantity of 5 pieces.

Key Features

• KC850 grade carbide with CVD TiC/TiCN/TiN multilayer coating for wear resistance
• Partial profile 60-degree thread standard for external UN and metric thread forms
• Right-hand cutting orientation
• 0.11 mm (0.0043 inch) corner radius
• Covers 1.25 mm to 6.25 mm pitch range (4 to 20 TPI)
• Part of the Top Notch series toolholder system

Compatibility

Designed for use with Kennametal Top Notch series threading toolholders configured for external right-hand threading operations with a 60-degree insert seat.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before changing inserts. Use the appropriate Torx or hex key as specified by the toolholder manufacturer to secure the insert clamp. Inspect the insert pocket and clamp for debris or damage before seating a new insert.