Kennametal 1799443 Threading Insert NA4R5 KC5025 Carbide

Product Description

The KENNAMETAL 1799443 is a carbide threading insert designed for cutting Acme-form threads at 5 threads per inch (TPI). It carries the KC5025 manufacturer grade and features a TiAlN finish applied via PVD coating, which improves wear resistance and heat tolerance during interrupted or continuous threading operations. The insert uses a 29-degree included angle and is configured for right-hand cutting. It fits the Top Notch insert series and is suited for both internal and external thread applications. Licensed HVAC and machining trade professionals will recognize this as a precision replacement insert for turning centers and manual lathes where Acme thread profiles are required.

This insert is intended for use in metal-cutting applications that demand accurate Acme thread geometry. The NA4R5 insert style is right-hand oriented and suitable for threading on CNC lathes or manual turning equipment. Insert size 4 and the Top Notch series designation determine toolholder compatibility. Material grades C2 and C6 indicate suitability for general-purpose machining, including cast iron, non-ferrous metals, and some steels. The TiAlN PVD coating extends tool life in dry or semi-dry cutting conditions.

Key Features

• Carbide substrate with TiAlN PVD finish for extended wear resistance
• 29-degree included angle for Acme thread standard geometry
• 5 TPI internal and external thread capability in a single insert
• Right-hand cut orientation, Top Notch series toolholder compatible
• Insert size 4 with a tip-to-top height of 0.2020 inches (5.13 mm)
• Cutting tip width of 0.0689 inches (1.75 mm) for precise thread form

Compatibility

Designed as an OEM-style replacement threading insert for Top Notch series toolholders accepting size 4 inserts. Specific toolholder compatibility should be confirmed against KENNAMETAL Top Notch system documentation before installation.

Installation Notes

Threading inserts should be installed by a qualified machinist or tooling technician. Power down and lock out the machine spindle before seating or removing any insert. Use the correct torque wrench and clamping screw specified by the toolholder manufacturer — do not overtighten, as carbide inserts are brittle and can crack under excessive clamping force. Inspect the insert pocket for debris or damage before seating a new insert.